单项选择题

He was a man of noble ______. He came from an old and prominent family in Virgini

A． sourceB. rootC. resourceD. origin
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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 from 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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