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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单项选择题
Which of the following is NOT mentioned in the passage
A．Computers are efficient in retraining unemployed workers.
B．Computers may offer more working opportunities than they destroy.
C．Computers will increase the unemployment rate of young blacks.
D．Computers can help smaller organizations to function more effectively.
单项选择题
From the passage it can be inferred that ______.
A．all school children are offered a course in the use of computer
B．all unemployed workers are being retrained
C．in reality only a certain portion of unemployed workers will be retrained
D．retraining programmes are considered very important by the government
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