单项选择题

A．Family phone numbers.
B．Government service phone numbers.
C．Business phone numbers.
D．Professional services phone numbers.
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单项选择题
A．Friends.B．A police officer and an investigator.C．Two police officers.D．A police officer and a program hostess.
A．Friends.
B．A police officer and an investigator.
C．Two police officers.
D．A police officer and a program hostess.
单项选择题
A．A new fuel for buses.B．The causes of air pollution.C．A way to improve fuel efficiency in buses.D．Careers in environmental engineering.
A．A new fuel for buses.
B．The causes of air pollution.
C．A way to improve fuel efficiency in buses.
D．Careers in environmental engineering.
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