单项选择题

What would happen if a person were supported by the life preserver in a wrong position

A．The waves would move him backwards.
B．The water would choke him.
C．He would immediately sink to the bottom.
D．He might be exhausted or unconscious.
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单项选择题
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
单项选择题
The word chilling (Sent. 3, Par
A．2) most probably means ______.A. discouragingB. convincingC. misleadingD. interesting
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