单项选择题

Without the support and leadership of management, the change to computerization will probably______.

A．take twice as long
B．cost a great deal
C．be unsuccessful
D．end up losing money
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单项选择题
According to the passage, a complete conversion can take______.
A．several months
B．about a year
C．half a year
D．several years
单项选择题
The two main requirements of aircraft design are______.
A．speed and cost
B．reliability and passenger comfort
C．lightness and dependability
D．ability to stay up in the air and reliability
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