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
When a machine analyses the frequencies used by a particular voice and draws a graph of them, sound is ________electronically into a pattern of lines.
A．relieved
B．converted
C．magnified
D．burst
单项选择题
We have already made plans for a visit, but ________difficulties with the car prevented it.
A．successive
B．subsequent
C．successful
D．subsidiary
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