单项选择题

A．A code number.
B．An agent.
C．An airliner.
D．A heavy bomber.
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单项选择题
The idea of a balanced diet is very difficult to ______ to anyone who knows nothing about food values.
A．put through
B．put across
C．put down
D．put up
单项选择题
There are not many teachers who are strong ______ of traditional methods in English teaching.
A．sponsors
B．contributors
C．advocates
D．performers
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