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
The word chilling (Sent. 3, Par
A．2) most probably means ______.A. discouragingB. convincingC. misleadingD. interesting
单项选择题
The major problem discussed in the passage is ______.
A．the importance of lifelong retraining of the unemployed workers
B．the social consequences of the widespread use of computers in the United States
C．the barrier to the employment of young people
D．the general rule of the advancement of technology
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