单项选择题

Running can strengthen your heart and muscles, but ,it can damage your knee joints and the bones in your feet.

A．previously
B．formerly
C．conversely
D．literally
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单项选择题
During their first teacher-training year, the students often visited local schools for the ______ of lessons.
A．investigation
B．observation
C．inspection
D．examination
单项选择题
She watched him ______ all the handles and gears in his automobile until she thought she could run it herself.
A．manipulate
B．use
C．control
D．dominate
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