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
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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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