Scientific research indicates that two-thirds of the earth’s surface ______ with

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问题 Scientific research indicates that two-thirds of the earth’s surface ______ with water.

选项 A、covered
B、are covered
C、covers
D、is covered

答案 D

解析该题考查考生对主谓一致以及被动语态的掌握。地球三分之二的表面是个单数概念，所以要用第三人称单数；同时，地球三分之二的表面被水覆盖是被动概念，所以要用被动语态。

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