单项选择题

A fire engine must have priority as it usually has to deal with some kind of（）.

A．precaution
B．crisis
C．emergency
D．urgency

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单项选择题
Our manager is （） an important customer now and he will be back this afternoon.

A．calling on
B．calling in
C．calling up
D．calling for
单项选择题
Professor Wang, （）for his informative lectures, was warmly received by his students.

A．knowing
B．known
C．to be known
D．having known
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