Nearly _______of the earth___covered by sea.

A．three fourth; isB．three fourths; is
C．three fourth; areD．three fourths; are

B

解析試題分析：句意幾乎地球表面的四分之三被海洋覆蓋。分數(shù)的表達方式：分子用基數(shù)詞，分母用序數(shù)詞，當分子超過一了，分母變復數(shù)，本題中把地球看做整體，所以謂語動詞用單數(shù)，故選B。
考點：分數(shù)的用法

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