The passage is mainly about_

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The passage is mainly about_

  • A.the uses of life preservers
  • B.the design of life preservers
  • C.the materials for life preservers
  • D.the buoyancy of life preservers

参考答案:

B

文章主要讲述了救生衣的设计。间接题型段首主旨题。C项和D项都是对救生衣设计中设计材料的说明。A项为陷阱,指救生衣的用途,尽管开头提到,但范围不着边际。故只有B是正确选项。