单项选择题

He has some electronic equipment originally intended for the language laboratory, which ______the sound quality.

A．magnifies
B．strengthens
C．enhances
D．enlarges
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The issue of where the peace talks will be held may seem______, but to the participants it is very important.
A．trivial
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All the people hold that this talented university student recruited by IBM is on the______ of a brilliant career.
A．corridor
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C．edge
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