单项选择题

The speakers are________.

A．a student and the director of the housing office
B．a student and a professor
C．two students
D．two housing office staff members
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单项选择题
What steps could be taken to improve the air
A．Reduce the amount of nitrogen.
B．Increase the release of oxygen.
C．Reduce nitrous oxide emissions.
D．Stop industrial activities.
单项选择题
Friends of Animals, Inc. is ________.
A．a tax-funded organization
B．a society which roams the streets
C．a control center for destroying strays
D．an agency interested in animals
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