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．impulse
C．instinct
D．response
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单项选择题
Military orders are ______ and cannot be disobeyed.
A．defective
B．conservative
C．alternative
D．imperative
单项选择题
It is probably both that he is going to the meeting on time ______ by the morning traffic jam.
A．and that he might be delayed
B．or that he might be delayed
C．and he might be delayed
D．otherwise that he might be delayed
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