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 from 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

Before the war broke out, many people ______ in safe places possessions they could not take with them.

A．threw away
B．put away
C．gave away
D．carried away

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