问题
选择题
Exploring the moon is a(n) _____ to China as well as the whole world. [ ]
A. opportunity
B. challenge
C. reaction
D. threat
答案
答案：B
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Exploring the moon is a(n) _____ to China as well as the whole world. [ ]
A. opportunity
B. challenge
C. reaction
D. threat
答案：B