单项选择题

The polar explorers took every precaution to ________the dangers of their trip.

A．optimize
B．standardize
C．energize
D．minimize
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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．impulse
C．instinct
D．response
单项选择题
During the business intervals, customers appreciate the guest rooms which are full of pictures and other beautiful________
A．imitations
B．illustrations
C．ornaments
D．implementations
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