单项选择题

Once the ______ contradiction is grasped, all problems will be readily solved.

A．principle
B．principal
C．potential
D．primitive

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单项选择题

You'll find that the community has ______ great changes since you were here last time.

A．submitted
B．sustained
C．perceived
D．undergone

单项选择题

I arrive at nine o'clock, teach until twelve thirty and then have a meal; that is my morning ______.

A．habit
B．custom
C．practice
D．routine

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