不定项选择

个体体脂含量与机体储热能力呈正相关关系。

A．正确
B．错误

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While gold has played monetary roles since ancient times, the gold standard as a legal institution dates from then.

答案：错误

单项选择题

语言既是一种自然现象，也是一种社会现象。

A．对
B．错