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
The sky was so clear in fact that the communications crew and recovery team could watch the balloon______ to its maximum altitude with the naked eye.
A．hike
B．elevate
C．escalate
D．ascend
单项选择题
He thought that socialism was the most important cause to which he could______ himself.
A．dedicated
B．catered
C．ascribed
D．clung
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