单项选择题

There are a lot of retired politicians that often ______ with top-dollar law firms in New York.

A．sign on
B．sign away
C．sign in
D．sign off
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单项选择题
These apples from the local area ______ in size from small to medium.
A．modify
B．change
C．vary
D．alter
单项选择题
Some countries in the disaster areas have difficulty in solving the problems of their ______ food supply.
A．rare
B．short
C．scarce
D．lack
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