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
Contrast may make something appear more beautiful than it is when（）alone.

A. seen
B. is seen
C. to be seen
D. having been seen
单项选择题
New books were displayed in a（）position on tables at the front of the shop.

A. prominent
B. distinguished
C. well-known
D. outstanding
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