单项选择题

There was a noisy ______ at the back of the hall when the speaker began his address.

A．interaction
B．interference
C．disturbance
D．interruption
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单项选择题
The ______ of his death were highly suspicious.
A．circumstances
B．events
C．conditions
D．reasons
单项选择题
The old man got things straight enough to settle down at last to his usual ______.
A．habit
B．practice
C．routine
D．custom
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