How is clean water brought to our homes？
A．Through pipes from the sewage works.B．Through underground main pipes.C．Through pipes from storage tanks.D．Through small pipes under the road.

相关问题推荐

• You must remember to______ all your belongings out of this office today.
  A．fetchB．take awayC．bringD．take

  查看答案
• Many countries are increasing their use of natural gas, wind and other forms of______.
  A．energyB．sourceC．powerD．material

  查看答案
• Years ago our cities were full of cars, buses and trucks. Now the streets are completely congested (拥挤的) and it is very difficult to drive a car along them. Drivers must stop at hundreds of traffic lights. What are our cities going to be like in ten or twenty years？ Will enormous (巨大的) motorways be built across them？ With big motorways cutting across them, full of noisy, dirty cars and lorries, our cities are going to be awful places. How can we solve the problem？There are some good ideas to reduce the use of private cars. In 1989, for example, the authorities in Rome began an interesting experiment: passengers on the city buses did not have to pay for their tickets.In Stockholm there was another experiment: people paid very little for a season ticket to travel on any bus, trolley bus, train or tram in all the city.In many cities now some streets are closed to vehicles, and pedestrians are safe there.In London there is another experiment: part of the street is for buses only, so the buses can travel fast. There are no cars or taxies in front of them.What the writer worries about in a big city is ______.
  A．the number of traffic lightsB．the shortage of busesC．the lack of motorwaysD．the traffic congestion

  查看答案
• The other day, Mum and I went to St. James"s Hospital, and they did lots and lots of tests on me, ______are horrible and frightening.
  A．most of themB．most of whichC．most of thatD．most of what

  查看答案
• 当前，全球所面临的重大环境问题的中心问题是___________。

  查看答案