题目内容

         of the surface of the earth          covered with water.
A．Seven-tens...are B． Seven-tens…is
C． Seven-tenths...isD．Seven-tenths...are
C

试题分析：句意：地球表面的十分之七被水覆盖。分数的基本形式为分子为基数词，分母为序数词，分数视为一个整体，单数，故选C.
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