单项选择题

Heart ______ is much more common these days than it was even ten years ago.

A．surgery
B．surgeon
C．work
D．circulation
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单项选择题
These planes are designed to travel at ______ speeds.
A．sounding
B．fatal
C．supersonic
D．soaring
单项选择题
Language learning usually ______ conscious imitation.
A．inspires
B．enriches
C．necessitates
D．stimulates
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