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

B 【解析】試題分析：句意為：地球大約四分之三被水覆蓋。但是我們擁有的可用淡水越來越少。分?jǐn)?shù)的表達：分子用基數(shù)詞，分母用序數(shù)詞，當(dāng)分子大于一時，分母應(yīng)加“s”。根據(jù)語境，這里主語為單數(shù)概念，根據(jù)主謂一致原則，謂語動詞也應(yīng)用第三人稱單數(shù)。故應(yīng)選B。
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