单项选择题

Every field of chemistry ______ different chemical reactions.

A．holds
B．consists
C．composes
D．involves
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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
单项选择题
Tom is ______ anyone in our class in sports.
A．superior than
B．more superior than
C．superior to
D．more superior to
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