摘要: There are over 58, 000 rocky objects in space, about 900 of which could fall down onto earth. A.the; the B. 不填; the C.the; 不填 D.a; the [解析]:B.考查冠词.句意:太空中有超过58000块的岩状物体.其中大约有900块有可能掉到地球上.第一空in space 是固定短语.不用冠词,第二空名词earth属于独一无二事物的名词.其前必须用定冠词.

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