There are over 58, 000 rocky objects in space, about 900 of which could fall down onto e

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

A. the; the(答案→)B. 不填; theC. the; 不填D. a; the解析：考查冠词。第一空考查固定搭配in space在太空；第二空the earth特指地球。句意：在太空里有58,000个岩石体，大约有900颗可能会落到地球上。故B正确。

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