单项选择题

Young children soon _______ words they hear their elders use.

A．put forward
B．mm up
C．pick up
D．use up
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单项选择题
Local residents tired hard to protect this _______ of elephants from being killed.
A．crowd
B．school'
C．herd
D．flock
单项选择题
The soldier had qualified as a doctor, but later he gave up the ________ of medicine for fulltime training.
A．fight
B．treatment
C．practice
D．project
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