单项选择题

The local medical officer reported a serious ______ of food-poisoning.

A．state
B．incident
C．outbreak
D．event
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单项选择题
An executive has to have a lot of ______ to reach the top.
A．attention
B．acceleration
C．affection
D．ambition
单项选择题
The town in the valley is ______ by a high mountain.
A．confronted
B．distributed
C．constituted
D．dominated
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