学历教育 - 英语考试
共用题干
1.Certainly no creature in the sea is odder than the common sea cucumber. All living creatures,especially human beings,have their peculiarities,but everything about the little sea cucumber seems unusual.What else can be said about a bizarre animal that,among other eccentricities, eats mud,feeds almost continuously day and night but can live without eating for long periods,and can be poisonous but is considered supremely edible by gourmets?
2.For some fifty million years,despite all its eccentricities,the sea cucumber has subsisted on its diet of mud.It is adaptable enough to live attached to rocks by its tube feet,under rocks in shallow water,or on the surface of mud flats.Common in cool water on both Atlantic and Pacific shores, it has the ability to suck up mud or sand and digest whatever nutrients are present.
3.Sea cucumbers come in a variety of colors,ranging from black to reddish brown to sand color and nearly white.One form even has vivid purple tentacles.Usually the creatures are cucumber shaped一hence their name一and because they are typically rock inhabitants,this shape,combined with flexibility,enables them to squeeze into crevices where they are safe from predators and ocean currents.
4.Although they have voracious appetites,eating day and night,sea cucumbers have the capacity to become quiescent and live at a low metabolic rate feeding sparingly or not at all for long periods,so that the marine organisms that provide their food have a chance to multiply.If it were not for this faculty,they would devour all the food available in a short time and would probably starve themselves out of existence.
5.But the most spectacular thing about the sea cucumber is the way it defends itself. Its major enemies are fish and crabs,when attacked,it squirts all its internal organs into water. It also casts off attached structures such as tentacles.The sea cucumber will eviscerate and regenerate itself if it is attacked or even touched;it will do the same if the surrounding water temperature is too high or if the water becomes too polluted.
When attacked,sea cucumbers can cast off certain organs and______.
A:extinct
B:bizarre
C:interesting
D:inactive
E:greedy
F: reproduce
查看答案
1.Certainly no creature in the sea is odder than the common sea cucumber. All living creatures,especially human beings,have their peculiarities,but everything about the little sea cucumber seems unusual.What else can be said about a bizarre animal that,among other eccentricities, eats mud,feeds almost continuously day and night but can live without eating for long periods,and can be poisonous but is considered supremely edible by gourmets?
2.For some fifty million years,despite all its eccentricities,the sea cucumber has subsisted on its diet of mud.It is adaptable enough to live attached to rocks by its tube feet,under rocks in shallow water,or on the surface of mud flats.Common in cool water on both Atlantic and Pacific shores, it has the ability to suck up mud or sand and digest whatever nutrients are present.
3.Sea cucumbers come in a variety of colors,ranging from black to reddish brown to sand color and nearly white.One form even has vivid purple tentacles.Usually the creatures are cucumber shaped一hence their name一and because they are typically rock inhabitants,this shape,combined with flexibility,enables them to squeeze into crevices where they are safe from predators and ocean currents.
4.Although they have voracious appetites,eating day and night,sea cucumbers have the capacity to become quiescent and live at a low metabolic rate feeding sparingly or not at all for long periods,so that the marine organisms that provide their food have a chance to multiply.If it were not for this faculty,they would devour all the food available in a short time and would probably starve themselves out of existence.
5.But the most spectacular thing about the sea cucumber is the way it defends itself. Its major enemies are fish and crabs,when attacked,it squirts all its internal organs into water. It also casts off attached structures such as tentacles.The sea cucumber will eviscerate and regenerate itself if it is attacked or even touched;it will do the same if the surrounding water temperature is too high or if the water becomes too polluted.
When attacked,sea cucumbers can cast off certain organs and______.
A:extinct
B:bizarre
C:interesting
D:inactive
E:greedy
F: reproduce
共用题干
Semco
At 21,Ricardo Semler became boss of his father's business in Brazil,Semco,which sold parts for ships.
Semler Junior worked like a madman,from 7:30 a. m.until midnight every day.One afternoon,while touring
a factory in New York,he collapsed.The doctor who treated him said,"There's nothing wrong with you.But
if you continue like this,you'll find a new home in our hospital." Semler got the message.He changed the
way he worked.In fact,he changed the way his employees worked too.
He let his workers take more responsibility so that they would be the ones worrying when things went
wrong. He allowed them to set their own salaries,and he cut all the jobs he thought were unnecessary,like re--
ceptionists and secretaries._______________ (46)"Everyone at Semco,even top managers,meets guests in recep-
tion,does the photocopying,sends faxes,types letters and dials the phone."
He completely reorganized the office:instead of walls,they have plants at Semco,so bosses can't shut
themselves away from everyone else._______________ (47)As for uniforms,some people wear suits and others
wear T-shirts.
Semler says,"We have a sales manager named Rubin Agater who sits there reading the newspaper hour
after hour. He doesn't even pretend to be busy.But when a Semco pump on the other side of the world fails
and millions of gallons of oil are about to spill into the sea,Rubin springs into action.______________(48)
That's when he earns his salary. No one cares if he doesn't look busy the rest of the time."
Semco has flexible working hours;the employees decide when they need to arrive at work.The employees
also evaluate their bosses twice a year.______________ (49)
It sounds perfect,but does it work?The answer is in the numbers:in the last six years,Semco's revenues
have gone from$35 million to $212 million.The company has grown from eight hundred employees to
3,000.Why?
Semler says it's because of"peer pressure".Peer pressure makes employees work hard for everyone
else._______________ (50)In other words,Ricardo Semler treats his workers like adults and expects them to act
like adults.And they do.
__________（46）
A:This saved money and brought more equality to the company.
B:He knows everything there is to know about our pumps and how to fix them.
C:And the workers are free to decorate their workspace as they want.
D:Most managers spend their time making it difficult for workers to work.
E:If someone isn't doing his job well,the other workers will not allow the situation to continue.
F: Also,Semco lets its workers use the company's machines for their own projects,and makes them take holidays for at least thirty days a year.
查看答案
Semco
At 21,Ricardo Semler became boss of his father's business in Brazil,Semco,which sold parts for ships.
Semler Junior worked like a madman,from 7:30 a. m.until midnight every day.One afternoon,while touring
a factory in New York,he collapsed.The doctor who treated him said,"There's nothing wrong with you.But
if you continue like this,you'll find a new home in our hospital." Semler got the message.He changed the
way he worked.In fact,he changed the way his employees worked too.
He let his workers take more responsibility so that they would be the ones worrying when things went
wrong. He allowed them to set their own salaries,and he cut all the jobs he thought were unnecessary,like re--
ceptionists and secretaries._______________ (46)"Everyone at Semco,even top managers,meets guests in recep-
tion,does the photocopying,sends faxes,types letters and dials the phone."
He completely reorganized the office:instead of walls,they have plants at Semco,so bosses can't shut
themselves away from everyone else._______________ (47)As for uniforms,some people wear suits and others
wear T-shirts.
Semler says,"We have a sales manager named Rubin Agater who sits there reading the newspaper hour
after hour. He doesn't even pretend to be busy.But when a Semco pump on the other side of the world fails
and millions of gallons of oil are about to spill into the sea,Rubin springs into action.______________(48)
That's when he earns his salary. No one cares if he doesn't look busy the rest of the time."
Semco has flexible working hours;the employees decide when they need to arrive at work.The employees
also evaluate their bosses twice a year.______________ (49)
It sounds perfect,but does it work?The answer is in the numbers:in the last six years,Semco's revenues
have gone from$35 million to $212 million.The company has grown from eight hundred employees to
3,000.Why?
Semler says it's because of"peer pressure".Peer pressure makes employees work hard for everyone
else._______________ (50)In other words,Ricardo Semler treats his workers like adults and expects them to act
like adults.And they do.
__________（46）
A:This saved money and brought more equality to the company.
B:He knows everything there is to know about our pumps and how to fix them.
C:And the workers are free to decorate their workspace as they want.
D:Most managers spend their time making it difficult for workers to work.
E:If someone isn't doing his job well,the other workers will not allow the situation to continue.
F: Also,Semco lets its workers use the company's machines for their own projects,and makes them take holidays for at least thirty days a year.
Charles Wheeler's paintings often highlight the sharp edges and geometrical shapes of machines.
A:extend
B:emphasize
C:distort
D:soften
查看答案
A:extend
B:emphasize
C:distort
D:soften
共用题干
Dangers Await Babies with Altitude
Women who live in the world's highest communities tend to give birth to under-weight ha-bies,a new study suggests.These babies may grow into adults with a high risk of heart disease and strokes.
Research has hinted that newborns in mountain communities are lighter than average.But it wasn't clear whether this is due to reduced oxygen levels at high altitude or because their mothers are under-nourished—many people who live at high altitudes are relatively poor compared with those living lower down.
To find out more,Dino Giussani and his team at Cambridge University studied the records of
400 births in Bolivia during 1976 and 1998.The babies were born in both rich and poor areas of two cities:La Paz and Santa Cruz. La Paz is the highest city in the world,at 3 .65 kilometers a-bove sea level,while Santa Cruz is much lower,at 0.44 kilometers.
Sure enough,Giussani found that the average birthweight of babies in La Paz was significant-ly lower than in Santa Cruz.This was true in both high and low-income families.Even babies born to poor families in Santa Cruz were heavier on average than babies born to wealthy families in lofty La Paz.“We were very surprised by this result,”says Giussani.
The results suggest that babies born at high altitude are deprived of oxygen before birth.
“This may trigger the release or suppression of hormones that regulate growth of the unborn child,”says Giussani.
His team also found that high-altitude babies tended to have relatively larger heads compared with their bodies. This is probably because a fetus starved of oxygen will send oxygenated blood to the brain in preference to rest of the body.
Giussani wants to find out if such babies have a higher risk of disease in later life.Peopleborn in La Paz might be prone to heart trouble in adulthood,for example.Low birth weight is a risk factor for coronary（冠状的）heart disease. And newborns with a high ratio of head size to body weight are often predisposed to high blood pressure and strokes in later life.
It canbelearned form thelast paragraphthat _____.
A:high-altitude babies tendtohave high blood pressure in their later life
B:under-weight babies have a shorter life span
C: babies born to poor families lack hormones before birth
D: newborns in wealthy families have larger heads compared with their bodies
查看答案
Dangers Await Babies with Altitude
Women who live in the world's highest communities tend to give birth to under-weight ha-bies,a new study suggests.These babies may grow into adults with a high risk of heart disease and strokes.
Research has hinted that newborns in mountain communities are lighter than average.But it wasn't clear whether this is due to reduced oxygen levels at high altitude or because their mothers are under-nourished—many people who live at high altitudes are relatively poor compared with those living lower down.
To find out more,Dino Giussani and his team at Cambridge University studied the records of
400 births in Bolivia during 1976 and 1998.The babies were born in both rich and poor areas of two cities:La Paz and Santa Cruz. La Paz is the highest city in the world,at 3 .65 kilometers a-bove sea level,while Santa Cruz is much lower,at 0.44 kilometers.
Sure enough,Giussani found that the average birthweight of babies in La Paz was significant-ly lower than in Santa Cruz.This was true in both high and low-income families.Even babies born to poor families in Santa Cruz were heavier on average than babies born to wealthy families in lofty La Paz.“We were very surprised by this result,”says Giussani.
The results suggest that babies born at high altitude are deprived of oxygen before birth.
“This may trigger the release or suppression of hormones that regulate growth of the unborn child,”says Giussani.
His team also found that high-altitude babies tended to have relatively larger heads compared with their bodies. This is probably because a fetus starved of oxygen will send oxygenated blood to the brain in preference to rest of the body.
Giussani wants to find out if such babies have a higher risk of disease in later life.Peopleborn in La Paz might be prone to heart trouble in adulthood,for example.Low birth weight is a risk factor for coronary（冠状的）heart disease. And newborns with a high ratio of head size to body weight are often predisposed to high blood pressure and strokes in later life.
It canbelearned form thelast paragraphthat _____.
A:high-altitude babies tendtohave high blood pressure in their later life
B:under-weight babies have a shorter life span
C: babies born to poor families lack hormones before birth
D: newborns in wealthy families have larger heads compared with their bodies
共用题干
第一篇
Plagiarize
Last fall Susan Youngwood,a journalism instructor at St. Michael's College,phoned the offices of Columbia Journalism Review(CJR)to pose a question.For an exercise in covering speeches,she
had asked her students to listen to John F. Kennedy's inaugural address and write a story about it.The sixteen students,mostly sophomores,complied with the assignment. However,two students,acting independently,took a short cut,plagiarized New York Times' account of Kennedy's speech,and submitted the Times's words as their own.
The students received an F for the course,the maximum penalty the journalism department demands.But Youngwood wanted more.She wanted examples that told her students why plagiarism was bad,and looked to CJR for guidance."I was curious about what happens on a professional level,"she said."If I am caught plagiarizing,what happens?"
Her question was interesting. But the answers,like so many,are not a crisp black or white.
Their tones of gray mirror the inconsistency with which society treats dozens of other offenses.To be sure,most writers and editors still regard plagiarism as a journalistic evil一the profession's cardinal sin."This is something you never,never do,"says James Fallows,Washington editor of The Atlantic Monthly. Every line of work needs clear rules.If you are a soldier,you don't desert. If you are a writer,you don't steal anyone's prose.It should be the one automatic firing.
But it is not. Punishment is uneven,ranging from severe to virtually nothing even for major offenses.Some editors will keep a plagiarist on staff or will knowingly hire one if talent outweighs the wrong doing.
If convinced Watergate burglar G. Gordon Liddy can become a talk show host with a hand of admiring followers and Richard Nixon can go to his grave a respected elder statesman,it's hardly surprising the journalists who commit plagiarism can continue their careers at the same publication or move on to some loftier endeavor.
Liddy and Nixon are mentioned in the passage probably as an example to show______.
A:how society punishes plagiarists in spite of their popularity
B:why burglars and cooked politicians can escape punishment
C:why it is hard for the journalist profession to uphold its principle
D:how reporters can escape from severe punishment such as being fired
查看答案
第一篇
Plagiarize
Last fall Susan Youngwood,a journalism instructor at St. Michael's College,phoned the offices of Columbia Journalism Review(CJR)to pose a question.For an exercise in covering speeches,she
had asked her students to listen to John F. Kennedy's inaugural address and write a story about it.The sixteen students,mostly sophomores,complied with the assignment. However,two students,acting independently,took a short cut,plagiarized New York Times' account of Kennedy's speech,and submitted the Times's words as their own.
The students received an F for the course,the maximum penalty the journalism department demands.But Youngwood wanted more.She wanted examples that told her students why plagiarism was bad,and looked to CJR for guidance."I was curious about what happens on a professional level,"she said."If I am caught plagiarizing,what happens?"
Her question was interesting. But the answers,like so many,are not a crisp black or white.
Their tones of gray mirror the inconsistency with which society treats dozens of other offenses.To be sure,most writers and editors still regard plagiarism as a journalistic evil一the profession's cardinal sin."This is something you never,never do,"says James Fallows,Washington editor of The Atlantic Monthly. Every line of work needs clear rules.If you are a soldier,you don't desert. If you are a writer,you don't steal anyone's prose.It should be the one automatic firing.
But it is not. Punishment is uneven,ranging from severe to virtually nothing even for major offenses.Some editors will keep a plagiarist on staff or will knowingly hire one if talent outweighs the wrong doing.
If convinced Watergate burglar G. Gordon Liddy can become a talk show host with a hand of admiring followers and Richard Nixon can go to his grave a respected elder statesman,it's hardly surprising the journalists who commit plagiarism can continue their careers at the same publication or move on to some loftier endeavor.
Liddy and Nixon are mentioned in the passage probably as an example to show______.
A:how society punishes plagiarists in spite of their popularity
B:why burglars and cooked politicians can escape punishment
C:why it is hard for the journalist profession to uphold its principle
D:how reporters can escape from severe punishment such as being fired
共用题干
Interior Design
Although interior design has existed since the beginning of architecture,its development into a specialized field is really quite recent. Interior designers have become important partly because of the many functions that might be______(51)in a single large building.
The importance of interior design becomes______(52)when we realize how much time we ______(53)surrounded by four walls.Whenever we need to be indoors,we want our surroundings to be______(54)attractive and comfortable as possible.We also expect______(55) place to be appropriate to its use.
You would be______(56)if the inside of your bedroom were suddenly changed to look ______(57)the inside of a restaurant. And you wouldn't feel______(58)in a business office that has the appearance of a school.
It soon becomes clear that the interior designer's most important basic______(59)is the function of the particular______(60),for example,a theatre with poor sight lines,poor sound shaping qualities,and______(61)few entries and exists will not work for______(62)purposes,no matter how beautifully it might be______(63).Nevertheless,for any kind of space,the designer has to make many of the same kind of______(64).He or she must coordinate the shapes,lighting and decoration of everything from ceilling to floor,______(65)addition,the designer must usually select furniture or design built-in furniture,according to the functions that need to be served.
_________(60)
A:circumstance
B:environment
C: surroundings
D:space
查看答案
Interior Design
Although interior design has existed since the beginning of architecture,its development into a specialized field is really quite recent. Interior designers have become important partly because of the many functions that might be______(51)in a single large building.
The importance of interior design becomes______(52)when we realize how much time we ______(53)surrounded by four walls.Whenever we need to be indoors,we want our surroundings to be______(54)attractive and comfortable as possible.We also expect______(55) place to be appropriate to its use.
You would be______(56)if the inside of your bedroom were suddenly changed to look ______(57)the inside of a restaurant. And you wouldn't feel______(58)in a business office that has the appearance of a school.
It soon becomes clear that the interior designer's most important basic______(59)is the function of the particular______(60),for example,a theatre with poor sight lines,poor sound shaping qualities,and______(61)few entries and exists will not work for______(62)purposes,no matter how beautifully it might be______(63).Nevertheless,for any kind of space,the designer has to make many of the same kind of______(64).He or she must coordinate the shapes,lighting and decoration of everything from ceilling to floor,______(65)addition,the designer must usually select furniture or design built-in furniture,according to the functions that need to be served.
_________(60)
A:circumstance
B:environment
C: surroundings
D:space
共用题干
Free Statins with Fast Food could Neutralize Heart Risk
Fast food outlets could provide statin drugs free of1so that customers can reduce the heart disease dangers of fatty food,researchers at Imperial College London 2in a new study.
Statins reduce the3of unhealthy“LDL” cholesterol in the blood. A wealth of trial data has proven them to be highly effective at lowering a person's heart attack4.
In a paper published in the American Journal of Cardiology,Dr Darrel Francis and colleagues calculate that the reduction in heart attack risk offered by a statin is5to offset the increase in heart attack risk from6a cheeseburger and drinking a milkshake.
Dr Francis,from the National Heart and Lung Institute at Imperial College London,who is the senior author of the study,said:“Statins don't cut out all of the7effects of cheeseburgers and French fries. It's better to avoid fatty food altogether. But we've worked out that in terms of your8of having a heart attack. Taking a statin can reduce your risk to more or less the same9 as a fast food meal increases it.”“It's ironic that people are free to take as many unhealthy condi-ments in fast food outlets as they10,but statins,which are beneficial to heart health,have to be prescribed. It makes sense to make risk-reducing statins available just as easily as the unhealthy condiments that are 11 free of charge. It would cost less than 5 pence per/u>12一not much different to a sachet of sugar.”Dr Francis said.
When people engage in risky behaviours like driving or smoking,they're encouraged to take13that lower their risk,like14a seatbelt or choosing cigarettes with filters.
Taking a statin is a rational way of15some of the risks of eating a fatty meal.
6._________
A: buying
B: preparing
C: eating
D: cooking
查看答案
Free Statins with Fast Food could Neutralize Heart Risk
Fast food outlets could provide statin drugs free of1so that customers can reduce the heart disease dangers of fatty food,researchers at Imperial College London 2in a new study.
Statins reduce the3of unhealthy“LDL” cholesterol in the blood. A wealth of trial data has proven them to be highly effective at lowering a person's heart attack4.
In a paper published in the American Journal of Cardiology,Dr Darrel Francis and colleagues calculate that the reduction in heart attack risk offered by a statin is5to offset the increase in heart attack risk from6a cheeseburger and drinking a milkshake.
Dr Francis,from the National Heart and Lung Institute at Imperial College London,who is the senior author of the study,said:“Statins don't cut out all of the7effects of cheeseburgers and French fries. It's better to avoid fatty food altogether. But we've worked out that in terms of your8of having a heart attack. Taking a statin can reduce your risk to more or less the same9 as a fast food meal increases it.”“It's ironic that people are free to take as many unhealthy condi-ments in fast food outlets as they10,but statins,which are beneficial to heart health,have to be prescribed. It makes sense to make risk-reducing statins available just as easily as the unhealthy condiments that are 11 free of charge. It would cost less than 5 pence per/u>12一not much different to a sachet of sugar.”Dr Francis said.
When people engage in risky behaviours like driving or smoking,they're encouraged to take13that lower their risk,like14a seatbelt or choosing cigarettes with filters.
Taking a statin is a rational way of15some of the risks of eating a fatty meal.
6._________
A: buying
B: preparing
C: eating
D: cooking
A. holds
B. watches
C. drops
D. covers
共用题干
第二篇
A Four-day Week
Fancy a three-day weekend一not just once in a while but week in week out? You may think your bosses would never agree to it,but the evidence suggests that employers,employees and the environment all benefit.
The four-day week comes in two flavors.One option is to switch from five 8-hour days to four 10-hour days,meaning overall hours and salaries stay the same.Two years age,the state of Utah moved all of its employees,apart from the emergency services,to working 4/10,as it has become known.The hope was that by shutting down buildings for an extra day each week,energy bills would be cut by up to a fifth.
The full results of this experiment won't be published until October,but an ongoing survey of 100 buildings suggests energy consumption has fallen by around 13 percent. The survey also found that 70 percent of employees prefer the 4/10 arrangement,and that people look fewer days off sick.
The second form of the four-day week is to work the same number of hours per day for four days only,with a 20 percent pay cut. With the recession hutting revenues , accountancy（会计工作） company KPMG announced in February that it was offering its 11,000 U.K. employees the option of a four-day week to avoid job losses.So far 85 percent of employees have applied to join the scheme, and 800 now do a four-day week.
Not everyone will like the idea of working longer days or taking a pay cut in exchange for a 3-day weekend,but it appears most do.According to Rex Facer at Brigham Young University in Provo,Utah,it was the crash of 1929 that led to the five-day week.During the next big financial crisis in the 1970s,there was much talk of moving to a four-day week,but for a variety of reasons that didn't pan out."Things are different now,"says Facer."I wouldn't be surprised if we could get 50 percent or more of the workforce working four-day weeks in the next few years."
By carrying out the four-day week experiment,the state of Utah aims to_______.
A:reduce energy expenses
B:boost the companies' productivity
C:provide longer weekend
D:increase energy efficiency
查看答案
第二篇
A Four-day Week
Fancy a three-day weekend一not just once in a while but week in week out? You may think your bosses would never agree to it,but the evidence suggests that employers,employees and the environment all benefit.
The four-day week comes in two flavors.One option is to switch from five 8-hour days to four 10-hour days,meaning overall hours and salaries stay the same.Two years age,the state of Utah moved all of its employees,apart from the emergency services,to working 4/10,as it has become known.The hope was that by shutting down buildings for an extra day each week,energy bills would be cut by up to a fifth.
The full results of this experiment won't be published until October,but an ongoing survey of 100 buildings suggests energy consumption has fallen by around 13 percent. The survey also found that 70 percent of employees prefer the 4/10 arrangement,and that people look fewer days off sick.
The second form of the four-day week is to work the same number of hours per day for four days only,with a 20 percent pay cut. With the recession hutting revenues , accountancy（会计工作） company KPMG announced in February that it was offering its 11,000 U.K. employees the option of a four-day week to avoid job losses.So far 85 percent of employees have applied to join the scheme, and 800 now do a four-day week.
Not everyone will like the idea of working longer days or taking a pay cut in exchange for a 3-day weekend,but it appears most do.According to Rex Facer at Brigham Young University in Provo,Utah,it was the crash of 1929 that led to the five-day week.During the next big financial crisis in the 1970s,there was much talk of moving to a four-day week,but for a variety of reasons that didn't pan out."Things are different now,"says Facer."I wouldn't be surprised if we could get 50 percent or more of the workforce working four-day weeks in the next few years."
By carrying out the four-day week experiment,the state of Utah aims to_______.
A:reduce energy expenses
B:boost the companies' productivity
C:provide longer weekend
D:increase energy efficiency
共用题干
Seeing Red Means Danger Ahead
The color red often means danger一and by paying attention,accidents can be prevented.In the future,
the color red also may help_________（51)danger at construction sites.Thanks to new work by engineers,
bridge supports一or________(52)kinds of materials一could one day contain a color-changing material.It
will turn red_________(53)a structure collapses or falls apart.
The secret__________(54)the color-switching material is。particular typo of molecule（分子）.A mole-
cule is a group of atoms（原子）held together by chemical bonds. Molecules come_________(55)all shapes
and sizes,and make up __________ (56)you can see,touch or feel.How a molecule behaves depends on
_________(57) kinds of atoms it contains,and how they're held together.
When a polymer(聚合物）containing a color-changing molecule called a mechanophore (机械响应性聚
合物）which is about to break,it produces a_________(58).When a polymer with mechanophore molecules
becomes" injured" or__________(59),one of the mechanophore bonds________（60）and the material turns
red."It'S a really simple detection method,"says Nancy Sottos,one of the scientists who worked on the pro-
ject.Sottos and her team tested the color-changing polymers in their lab.The test_________(61)proved
encouraging,
There is a way to get rid of the red color:light. When a bright light is shone on the mechanophore,the
broken bond is fixed,and the red color________(62).This"self-healing"may be a problem for mngi-
neers.They need to use the color-changer in big construction projects that will be_________(63)in sun-
light. And sunlight will make the rnechanophore'S warning system______(64).
Sottos and her fellow scientists still have _________(65)work to do before the color-changing mole-
cules can be used outside the lab.
_________(65)
A:a pair of
B:a type of
C:a lot of
D:a part of
查看答案
Seeing Red Means Danger Ahead
The color red often means danger一and by paying attention,accidents can be prevented.In the future,
the color red also may help_________（51)danger at construction sites.Thanks to new work by engineers,
bridge supports一or________(52)kinds of materials一could one day contain a color-changing material.It
will turn red_________(53)a structure collapses or falls apart.
The secret__________(54)the color-switching material is。particular typo of molecule（分子）.A mole-
cule is a group of atoms（原子）held together by chemical bonds. Molecules come_________(55)all shapes
and sizes,and make up __________ (56)you can see,touch or feel.How a molecule behaves depends on
_________(57) kinds of atoms it contains,and how they're held together.
When a polymer(聚合物）containing a color-changing molecule called a mechanophore (机械响应性聚
合物）which is about to break,it produces a_________(58).When a polymer with mechanophore molecules
becomes" injured" or__________(59),one of the mechanophore bonds________（60）and the material turns
red."It'S a really simple detection method,"says Nancy Sottos,one of the scientists who worked on the pro-
ject.Sottos and her team tested the color-changing polymers in their lab.The test_________(61)proved
encouraging,
There is a way to get rid of the red color:light. When a bright light is shone on the mechanophore,the
broken bond is fixed,and the red color________(62).This"self-healing"may be a problem for mngi-
neers.They need to use the color-changer in big construction projects that will be_________(63)in sun-
light. And sunlight will make the rnechanophore'S warning system______(64).
Sottos and her fellow scientists still have _________(65)work to do before the color-changing mole-
cules can be used outside the lab.
_________(65)
A:a pair of
B:a type of
C:a lot of
D:a part of