单项选择题

This can help to ______ something that the students may not. have comprehended.

A．signify
B．specify
C．testify
D．clarify
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单项选择题
He passed ______ hours in the library; he acquired information relative to the subject he was going to expound.
A．resulting
B．resultative
C．resultful
D．resulted
单项选择题
There was a noisy ______ at the back of the hall when the speaker began his address.
A．interaction
B．irritation
C．disturbance
D．interruption
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