单项选择题

Paul is an ______ worker, and rarely does well in examinations. However he often refuses our help.

A．errant
B．erroneous
C．erratic
D．exotic
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单项选择题
In recent years there has been a ______ increase in the cost of living; many families have to depend on the federal aids.
A．ponderous
B．powerful
C．significant
D．violent
单项选择题
There is a direct flight at 3:00 or a flight at 7:30 in the morning that ______ in Los Angeles.
A．stops by
B．stops in
C．stops over
D．stops up
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