问题
选择题
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; /
D. a; the
答案
答案：B
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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. /; the
C. the; /
D. a; the
答案：B