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
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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
单项选择题
Agriculture must, therefore, ______ workers and savings to the new industrialized, urbanized sectors if a modern economy is to be achieved.
A．yield
B．succumb
C．subject
D．resort
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