单项选择题

History was being catalogued here, the missed opportunities, blunders, and outright mistakes.

A. attempts
B. insults
C. mistakes
D. arguments
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单项选择题
Jet pilots are being advised to land （）

A. on longer runways
B. from nearby areas
C. after dark
D. with reduced power
单项选择题
Good amounts of vitamin A can be found in（）

A. celery
B. banana
C. milk
D. cabbage
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