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
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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
单项选择题
The information -office at the station _______ that all trains were running about one hour behind time.
A．advertised
B．declared
C．determined
D．promised
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