单项选择题

No matter how______ a hill may be, it is not necessarily worthless.

A．vacant
B．barren
C．empty
D．hollow
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单项选择题
Women have significant advantages over men in space because they need less food and less oxygen and they______ radiation better.
A．stand up for
B．face up to
C．stand up to
D．break away from
单项选择题
Advertising is distinguished from other forms of communication______ the advertiser pays for the message to be delivered.
A．whereas
B．in that
C．in which
D．because of
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