单项选择题

According to the passage, a life preserver should be first of all ______.

A．adjustable
B．comfortable
C．self-evident
D．self-righting
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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
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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