5. (4分)South of the equator, 81 percent of the surface of the earth__ water. A. is B. are C. . was D. were

5.
(4分)South of the equator, 81 percent of the surface of the earth__ water.

A. is
B. are
C. . was
D. were

出自：兰州大学大学英语（3）

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