单项选择题

A．Paying ＄50.
B．Reusing washing machine water.
C．Fining your neighbor.
D．Taking baths instead of showers.
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单项选择题
A．Holding office hours.B．Grading student work.C．Directing labs.D．Leading discussion sessions.
A．Holding office hours.
B．Grading student work.
C．Directing labs.
D．Leading discussion sessions.
单项选择题
A．Become a representative of the class.B．Give a presentation to the class.C．Leave the class early.D．Take pictures.
A．Become a representative of the class.
B．Give a presentation to the class.
C．Leave the class early.
D．Take pictures.
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