题目内容
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
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题目内容
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