21.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
22.According to the passage, a life preserver should be first of all, ________.
A) adjustable
B) comfortable
C) self-evident
D) self-righting
23.United States Coast Guard does NOT require the life preserver to the made ________.
A) with as few strings as possible
B) capable of being worn on both sides
C) according to each wearers size
D) comfortable and light to wear
24.By the uninitiated individual the author refers to the person ________.
A) who has not been instructed how to use a life preserver
B) who has a little experience in using a life preserver
C) who uses a life preserver without permission
D) who becomes nervous before a disaster
25.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.
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