单项选择题

A careful biological experiment will __________ which factors are attributive to the plants' budding.

A．disperse
B．discern
C．dissipate
D．disregard
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单项选择题
He was given a gold badge (徽章) as a __________ for his commitment to the development in this field.
A．brim
B．token
C．miniature
D．siege
单项选择题
It was no __________ that he was seen haunting the bank before the robbery.
A．incidence
B．recurrence
C．competence
D．coincidence
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