单项选择题

We are flying at a(an) ______ of 20,000 feet.

A. altitude
B. aptitude
C. latitude
D. attitude
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单项选择题
The precise instrument can record the slightest ______ in pressure.
A. variety
B. variance
C. varsity
D. variation
单项选择题
______ the fact that we have made mistakes hi our work.
A. It is not to deny
B. There's no denying
C. Not to deny
D. There is not to deny
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