单项选择题

We have to try every means to ______ the costs of-the construction project.

A．bring up
B．bring down
C．bring forth
D．bring back
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单项选择题
Every field of chemistry ______ different chemical reactions.
A．holds
B．consists
C．composes
D．involves
单项选择题
The USA is composed of 50 states, ______ are separated form the others by land or water.
A．two of these
B．of whom two
C．two of which
D．two of that
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