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【单选题】

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
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根据网考网移动考试中心的统计,该试题:

15%的考友选择了A选项

74%的考友选择了B选项

3%的考友选择了C选项

8%的考友选择了D选项

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