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．retrospect
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单项选择题
He has failed me so many times that I no longer place any______ on what he promises.
A．fate
B．morality
C．confidence
D．reliance
单项选择题
These areas rely on agriculture utmost______ , having few mineral resources and a minimum of industrial development.
A．respectively
B．incredibly
C．extraordinarily
D．exclusively
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