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Nearly _______of the earth___covered by sea.

A．three fourth; is	B．three fourths; is
C．three fourth; are	D．three fourths; are

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

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