单项选择题

The first three aeroplanes of a new type______.

A．are only for show
B．are all destroyed
C．are later broken up for spare parts
D．are used for testing purposes
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单项选择题
We are told that George expected Jim to help ______ .
A．prove him innocent
B．him turn over a new leaf
C．lighten his punishment
D．him escape from prison
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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