The passage is mainly about ______. [br] According to the passage, a life preser

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问题 The passage is mainly about ______. [br] According to the passage, a life preserver should be first of all ______.

选项 A、adjustable
B、comfortable
C、self-evident
D、self-righting

答案 D

解析事实细节题。本文第三段主要讨论救生衣对不同落水方向的影响，应设计得能“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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Whatisthemainideaofthepassage?[br]Whichofthefollowingdescriptionab