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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单项选择题
A considerable amount of time and money has been invested in ______ this system.
A．defining
B．implying
C．reducing
D．perfecting
单项选择题
Some ______ good luck brought us nothing but trouble.
A．seemingly
B．satisfactorily
C．uniformly
D．universally
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