单项选择题

______, water is composed of two parts hydrogen and one part oxygen.

A．As is known
B．As be known
C．As known
D．Which is known
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单项选择题
She does not believe that he is ______ the honor accorded him.
A．worth of
B．worth
C．worthy of
D．worthy
单项选择题
Eighteenth-century statesmen were totally convinced that war could be used as ______ settling disputes.
A．a mean to
B．a means for
C．some means for
D．meanses for
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