句意：据我们所知,海洋覆盖了地球表面70%的地方.
选择A.sea（海洋）和surface（表面）都是特指跟地球有关的部分.而地球本身是独一无二的事物,也必须有定冠词.
As we know, ___ sea covers more than 70percent of ___ surface of_____ earth
As we know, ___ sea covers more than 70percent of ___ surface of_____ earth
A the,the,the
B a,the,the
C the,a,a
D a,a,the
求解析
A the,the,the
B a,the,the
C the,a,a
D a,a,the
求解析
英语人气：752 ℃时间：2020-04-02 14:59:20
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