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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单项选择题
A considerable amount of time and money has been invested in ______ this system.
A．defining
B．implying
C．reducing
D．perfecting
单项选择题
I don't know how to interpret her remark. I think it was deliberately ______.
A．distinct
B．ambiguous
C．suspicious
D．invisible
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