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 size or nature of a business, its main goal is to earn a profit.
A．Whatever
B．Of
C．Whereas
D．Because
单项选择题
The precise instrument can record the slightest _________ in pressure.
A．variety
B．variance
C．varsity
D．variation
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