单项选择题

Because of the severe international situation, the government has urged people to be _______ with food and water.

A．thrift
B．economic
C．economical
D．economy
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单项选择题
The introduction of fabrics made from rayon, nylon and other _______ fibers has made many changes in our civilization.
A．manufactured
B．artificial
C．synthetic
D．manned
单项选择题
She is so clever that I feel rather at a (an) _______ talking to her.
A．advantage
B．disadvantage
C．mistake
D．error
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