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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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
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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