68．From paragraph 5，we can know________.

　　A. the theory behind the recycling system

　　B. the effect of the recycling system

　　C. an opinion on recycling urine

　　D. the process of recycling urine

　　答案：D　推理判断题。根据第五段第一句“The new system takes the combined urine of the crew from the toilet, moves it to a big tank, where the water is boiled off, and the vapor is collected. The rest of the urine is thrown away.”可知，这是循环利用的过程。

　　69．What did Edeen say about recycled urine and the recycling system?

　　A．The taste of recycled urine is not as good as that of common water.

　　B．The recycling system has made a science fiction story come true.

　　C．The idea of drinking recycled urine makes astronauts feel unpleasant.

　　D．It takes a longer time on earth to make water from urine than in space.

　　答案：D　推理判断题。根据第五段最后一句中“...it is also done on earth, but with a lot longer time between urine and the tap.”可知，在地球上，把尿净化成自来水需要更长的时间。

　　70.What is the best title for the passage?

　　A. The Research of NASA Has Made Great Progress

　　B. New Technology Is Used in the Space Station

　　C. Drink up：Space Station Recycles Urine to Water

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