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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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 |