单项选择题

He comes back to his hometown to see his parents at regular ______.

A. gaps
B. pauses
C. intervals
D. spans
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单项选择题
We are flying at a(an) ______ of 20,000 feet.
A. altitude
B. aptitude
C. latitude
D. attitude
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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