单项选择题

The English are famous for exchanging ______ remarks on the weather.

A．persistent
B．pernicious
C．peripatetic
D．perfunctory
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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
单项选择题
Some professors prefer to control discussion while others prefer to guide the class without ______ it.
A．enforcing
B．dominating
C．enhancing
D．disposing
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