单项选择题

He ______ the bushes around his house carefully with D.D.T. every evening.

A．scattered
B．spread
C．sprayed
D．distributed
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单项选择题
The local medical officer reported a serious ______ of food-poisoning.
A．state
B．incident
C．outbreak
D．event
单项选择题
I'd like to ______ this old ear for a new model but I can't afford it.
A．interchange
B．exchange
C．replace
D．convert
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