By“ the uninitiated indi vidual”(Para.1,Line. 4) the author refers tothe person()
A. who has not been instructed how to use a life preserver
B. who has a little experience in using a life preser ver
C. who uses a life preserver without per miss ion
D. who becomes nervous before a disas ter
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标定NaOH溶液的基准物质有草酸和无水Na2CO3()
According to the passage,a life be first of all()
A. adjustable
B. comf ortable
C. self -evident
D. selfrighting
United States Coast Guard does NOT require the life preserver to bemade_
A. with as few strings as possible
B. capable of being worn on both sides
C. according to each wearer s size
D. confortable and light to we ar