单项选择题

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

A. instinct
B. impulse
C. consciousness
D. response
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单项选择题
The government ______ to approve the use of wide-spead surveillance when the Justice Department took objections.
A. is going
B. had been
C. was about
D. is coming
单项选择题
We were suddenly ______ when I was speaking to John on the, phone.
A. hung
B. cut down
C. cut off
D. hung back
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