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According to the passage，a life be f

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According to the passage，a life be first of all

A.adjustable
B.comf ortable
C.self -evident
D.selfrighting

参考答案:

D

根据文章，救生衣首先会自动扶正。事实细节题。本文第三段主要讨论救生衣落水位置，应设计的能“自动扶正”,或稍向后仰。B项是对材料的描述，范围太窄,而A和c不合题意，因此D是正确答案。

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