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
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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
单项选择题
All equipment in an aircraft must______.
A．be tested to destruction
B．not be too light in weight
C．work especially well at high temperatures
D．work perfectly within a wide range of temperatures
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