About_ of the earth covered with...

About_____ of the earth__ __covered with water, but we have less and less available fresh water.

A. three-fourth, is B.three-fourths, is

C. three-fourth, are D. three-fourths, are

A 【解析】试题分析：句意为：地球大约四分之三被水覆盖。但是我们拥有的越来越少。分数的表达：分子用基数词，分母用序数词，当分子大于一时，分母应加“s”。根据语境，这里主语为单数概念，根据主谓一致原则，谓语动词也应用第三人称单数。故应选A。考点：考查分数的表达及主谓一致问题。

考点分析：

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About_____ of the earth__ __covered with...