单项选择题

With three young children to take care of, Cathy is kept on the run every minute of the day.（）

A. walking
B. at full speed
C. busy
D. on foot

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A （） examination for the post of department manager will be held next Tuesday.

A. classifying
B. comparing
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Eighty percent of mothers cradle their （） in their left arms, holding them against the left side of their bodies.

A. infants
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