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

There are over 58,000 rocky objects in space, about 900 of which could fall down onto earth.
A. the; the
B. /; the
C. the; a
D. a; /

A. the; the(答案→)B. /; theC. the; aD. a; /解析：考查冠词：第一空不填，in space在太空，第二空填the，世界上独一无二的东西，如the earth，the sun要加定冠词the，选B。

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