单项选择题

Mary once （）with another musician to compose a piece of pop music.

A．merged
B．collaborated
C．coincided
D．constituted

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单项选择题
Generally, it is only when animals are trapped that they （）to violence in order to escape.

A．proceed
B．appeal
C．resort
D．incline
单项选择题
It is through learning that the individual （）many habitual ways of reacting to situations.

A．retains
B．gains
C．achieves
D．acquires
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