问题补充：
Scientists would like to place a huge mirror in space above the earth. It might be sixty miles wide. It would be used to catch the rays (光线) of the sun. It would direct the sun’s rays upon the earth as a child might do to make sunlight dance on the wall with a hand mirror.
Why do they want to do this? The sun’s rays could be helpful in many ways. They could light up cities by night. The warm rays could stop frosts (霜冻) which might come at night and hurt fruit crops. They could melt (融化) dangerous icebergs in the ocean. Perhaps they could change cloud movements and bring rain where it is needed.
【小题1】The huge mirror would . A．stand 60 miles in height (高度) B．be 60 miles from side to sideC．cover 60 miles of the earth D．be 60 miles above the earth【小题2】The mirror would be used to . A．reflect (反射) sunlightB．absorb (吸收) sunlightC．see what the earth looks like D．see how clouds move【小题3】The strong light from the mirror could possibly . A．hurt fruit cropsB．set fire to citiesC．bring longer daytimeD．shine through walls【小题4】The huge mirror is . A．something in a story B．already made C．just an ideaD．to be made soonB
答案：
(答案→)B
解析：本文叙述了科学家的一种想象，在地球的上方放一面60英里宽的镜子，它可以用来为城市延长照明的时间，它的能量可以融化霜冻，以防霜冻冻坏庄稼。还可以融化冰山，能够改变云的运动以便在需要雨的地方降雨。
【小题1】细节理解题。根据It might be sixty miles wide.故选B。
【小题2】细节理解题。根据It would be used to catch the rays (光线) of the sun. It would direct the sun’s rays upon the earth as a child might do to make sunlight dance on the wall with a hand mirror. 镜子能反射阳光，故选A。
【小题3】细节理解题。根据They could light up cities by night. 故选C。
【小题4】细节理解题。根据Scientists would like to place a huge mirror in space above the earth. It might be sixty miles wide. 这是科学家的想象出来的，故选C。
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