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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单项选择题
Scientists are claiming a major ______ in the treatment of cancer and AIDS.
A．distinction
B．breakthrough
C．identification
D．interpretation
单项选择题
The issue of where the peace talks will be held may seem ______, but to the participants it is very important.
A．trivial
B．miniature
C．minimum
D．minimal
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