单项选择题

Scientists employ many modern techniques to ______ the origin of the world.

A．watch
B．grasp
C．treat
D．probe
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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
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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