Thereareover58,000rockyobjectsin

问题详情：

 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  

【回答】

B

知识点：冠词

题型：选择题