单项选择题

An ambulance must have priority as it usually has to deal with some kind of ______.

A. crisis
B. emergency
C. urgency
D. emergence
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单项选择题
She sat on the bench in the park, her chin ______ in her hand.
A. was cupped
B. cupped
C. cupping
D. to be cupped
单项选择题
The meeting was so prolonged and exhausting that ______ the speakers stopped for refreshments.
A. at ease
B. at random
C. at intervals
D. at large
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