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
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
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