根據(jù)短文內(nèi)容，用方框中所給單詞的適當(dāng)形式填空，每詞限用一次。

Scientists would like to put a huge mirror in space above the earth. It might be sixty miles wide. It would be   小題1:to catch the rays of the sun. it would direct the sun’s rays on the earth as a child might do to make sunlight   小題2: on the wall with a hand mirror.
Why do they want to do this? The sun’s rays could be   小題3:  in many ways. They could light up   小題4:  by night. The warm rays could stop frosts(霜凍) which might come at night and hurt fruit and crops. They could melt（融化) 小題5: icebergs in the ocean. Perhaps they could change cloud movements and bring rain where it is needed.

小題1:used  
小題2:dance 
小題3:helpful
小題4:cities
小題5:dangerous

試題分析：
小題1:句意：它被用于捕捉太陽(yáng)的射線。 be used to do sth. 被用于做某事。  
小題2:句意：就像孩子用小鏡子使陽(yáng)光在墻上跳舞。 make +賓語(yǔ)+do sth. 使……做……。故此處用動(dòng)詞原形dance。   
小題3:句意：太陽(yáng)的光線在許多方面多很有用。根據(jù)They could light up可知此處是說(shuō)陽(yáng)光的和用途，又因位于be 動(dòng)詞后用形容詞helpful。
小題4:句意：他們能在黑夜照亮城市。結(jié)合句意可知此處用名詞復(fù)數(shù)cities 。
小題5:句意：他們能融化海洋里危險(xiǎn)的冰川。修飾icebergs in the ocean.可知大洋里的冰山容易讓船只翻船，因此是危險(xiǎn)的，因修飾名詞icebergs故用形容詞dangerous。
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