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
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单项选择题
By the uninitiated individual ( Par
A．1 ) the author refers to the person ______.A. who has not been instructed how to use a life preserverB. who has a little experience in using a life preserverC. who uses a life preserver without permissionD. who becomes nervous before a disaster
单项选择题
A coastguard does NOT require the life preserver to be made ______.
A．with as few strings as possible
B．capable of being worn on both sides
C．according to each wearer's size
D．comfortable and light to wear
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