单项选择题

His ears are highly sensitive ______ any unusual sound in the machine.

A. of
B. on
C. to
D. by
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单项选择题
He's perfectly (content) (living) in a hut and (paint) pictures (all day).
A. content
B. living
C. paint
D. all day
单项选择题
On the end of his nose was a ______ of thick glasses.
A. pair
B. set
C. couple
D. suit
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