单项选择题

While nuclear weapons present grave ______ . dangers, the predominant crisis of over population is with us today.

A．inevitable
B．constant
C．overwhelming
D．potential
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单项选择题
Disguised as fiction, novels are sometimes ______ accounts of actual.
A．veracious
B．venial
C．venal
D．veritable
单项选择题
The first and essential step in the study of any language is observing and ______ pre cisely what happens when native speakers speak it.
A．setting down
B．setting out
C．putting across
D．putting away
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