The salinity of the earth’s oceans is about______.A、thirty-five part per thousan

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问题 The salinity of the earth’s oceans is about______.

选项 A、thirty-five part per thousand
B、thirty-five parts per thousand
C、thirty-five of thousand
D、thirty-five out of thousand

答案 B

解析分数表达题。分数的一种表达结构为“基数词+part(s)+per+基数词”，名词part有“……分之一”的意思，分子大于1时，part用复数，故本题选[B]。

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