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
The President call on his people to work hard to improve the ________economy.
A．stationary
B．static
C．steady
D．stagnant
单项选择题
His writing is so ________that we can' t clarify his ideas in first reading.
A．obscure
B．objective
C．obliging
D．obstacle
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