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

試題分析：句意：地球表面的十分之七被水覆蓋。分數(shù)的基本形式為分子為基數(shù)詞，分母為序數(shù)詞，分數(shù)視為一個整體，單數(shù)，故選C.
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