Many large cities are【C1】______but beautiful. Streets are littered【C2】______garbage. In the garbage, however, there is still som

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问题     Many large cities are【C1】______but beautiful. Streets are littered【C2】______garbage. In the garbage, however, there is still something【C3】______can be useful.
    【C4】______people want to solve the problem of waste, there is no time to be【C5】______. They must work【C6】______ways of making use of good things which are just thrown away【C7】______waste.
    When a car gets too old, it may not run【C8】______. But the metal that the car was made【C9】______is still good. It can be put【C10】______use again.
    When a bottle is empty, it goes【C11】______the garbage. But bottle glass can be【C12】______into sand and used to【C13】______streets.
    Garbage【C14】______food can be changed into fertilizer. But first you have to【C15】______all the glass and metal.
    Garbage can also be a good【C16】______for making building blocks, which are then covered with concrete. Now , more and more machines are【C17】______for this purpose. Someday, people will watch films in a magnificent cinema which has been built【C18】______garbage/Future buildings, roads, and cities may be made【C19】______garbage. But so far, building beautiful cities out of garbage is only【C20】______.
【C4】

选项 A、When
B、If
C、Once
D、As

答案B

解析
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