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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单项选择题
The chairman of the company said that new techniques had _________ improved their production efficiency.
A．violently
B．severely
C．extremely
D．radically
单项选择题
Because the Appalachian Mountains were difficult to cross, Kentucky was not settled _________ eastern coastal area was.
A．otherwise
B．instead
C．until after
D．in spite of
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