单项选择题

Concrete, which is used in a wide range in modern society, ______ of cement, sand and gravel mixed with water.

A．consists
B．composes
C．concentrates
D．comprises
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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
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
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