单项选择题

The politician says he will ______ the welfare of the people.

A．prey on
B．take on
C．get at
D．see to
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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．impulses
C．instinct
D．response
单项选择题
The students have been working ______ for years for the public examination.
A．readily
B．industrially
C．objectively
D．industriously
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