单项选择题

Human behavior is mostly a product of learning, whereas the behavior of an animal depends mainly on ______.

A．consciousness
B．impulses
C．instinct
D．response
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单项选择题
Although the two players are ______ in the tennis court, they are really good friends.
A．partners
B．enemies
C．rivals
D．companions
单项选择题
The people living in these apartments have free ______ to that swimming pool.
A．access
B．excess
C．excursion
D．recreation
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