单项选择题

Your suggestion is ______, though it might be rather costly.

A．grand
B．vigorous
C．feasible
D．reliable
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单项选择题
When the main system fails, the backup system
A．take off.
B．take out.
C．take in.
D．take over.
单项选择题
Vigor or weakness results ______ from energy or carelessness.
A．consequently
B．conversely
C．respectively
D．previously
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