单项选择题

The maximum possible weight of an aircraft is determined by______.

A．the engine power
B．the amount of freight room
C．the number of passengers
D．international regulations
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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
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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