The salinity of the earth’s oceans is about______.

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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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