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
On the end of his nose was a ______ of thick glasses.
A．pair
B．set
C．couple
D．suit
单项选择题
According to the passage , we know the writer ______.
A．seldom loses things
B．very often loses things
C．loses things once in a while
D．never loses things
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