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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They have done away with ______ Latin for university entrance at Harvard.
A. influential
B. indispensable
C. compulsory
D. essential
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He had been there ______ a time, and knew everyone well.
A. much
B. many
C. some
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