2. 外语
  3. The use of nuclear power has already spread all over the world.【C1】______, scientists still have not agreed【C2】______What should

The use of nuclear power has already spread all over the world.【C1】______, scientists still have not agreed【C2】______What should

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问题     The use of nuclear power has already spread all over the world.【C1】______, scientists still have not agreed【C2】______What should be done with the large amounts of waste material that【C3】______to increase every year.  Most waste materials are【C4】______of simply by placing them somewhere.  But nuclear waste must be【C5】______with great care. It gives off dangerous【C6】______and will continue to be【C7】______for hundreds, thousands, even millions of years.
    How should we get rid of such waste material in【C8】______a way that it will not【C9】______the environment?  Where can we【C10】______distribute it? One idea is to put this radioactive waste inside a thick container,【C11】______is then dropped to the deep bottom of the ocean.【C12】______some scientists believe that this way of【C13】______nuclear waste could kill fish and other living things in the oceans or【C14】______with their growth. Another way to【C15】______nuclear waste is to send it into space, to the sun, where it would be  82  . Other scientists suggest that this polluting material be【C17】______thousands of meters under the earth’s surface.  Such underground areas must be【C18】______of possible earthquakes.  Advances  are being made. But it may still be. many years【C19】______this problem could finally be【C20】______
【C19】
选项 A、until
B、after
C、before
D、unless
答案C
解析 结构衔接题。本句使用的是It is/ was/ will be+ 时间 +before 的句型，表示这个问题还要好多年才能得以解决。
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