单项选择题

During their first teacher training year, the students often visited local schools for the of lessons. （）

A．observation
B．investigation
C．inspection
D．examination

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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
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
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