问题
选择题
From the space, the astronaut can see more than 70 percent of the earth _____ by water. [ ]
A. are covered
B. is covered
C. covering
D. cover
答案
答案：B
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From the space, the astronaut can see more than 70 percent of the earth _____ by water. [ ]
A. are covered
B. is covered
C. covering
D. cover
答案：B