单项选择题

Anthropologists usually study simple, unindustrialized societies because the number of______is limited.

A．vehicles
B．variables
C．varieties
D．systems

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单项选择题

When the man came ______after the operation he found himself back in bed.

A．on
B．in
C．over
D．round

单项选择题

His tone ______his real feelings more than his words.

A．paraphrased
B．conformed
C．performed
D．conveyed

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