单项选择题

A．Buildings.
B．Roads.
C．Films.
D．Cities.
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单项选择题
Sheep do not pair because their young do not require the joint attention of father and mother.
A．Y
B．N
C．NG
单项选择题
The children’’s behavior in the last paragraph _________.
A．can be best explained be behaviorism
B．can be linked to Pavlov’’s dogs
C．shows that rewards may well kill desire
D．serve to provided evidence to behaviorism
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