题目内容
Nearly _______of the earth___covered by sea.
| A．three fourth; is | B．three fourths; is |
| C．three fourth; are | D．three fourths; are |
B
解析试题分析：句意几乎地球表面的四分之三被海洋覆盖。分数的表达方式：分子用基数词，分母用序数词，当分子超过一了，分母变复数，本题中把地球看做整体，所以谓语动词用单数，故选B。
考点：分数的用法
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