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.
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单项选择题
A．Dr. Smith’’s waiting room isn’’t tidy.B．Dr. Smith enjoys reading magazines.C．Dr. Smith has left a good impression on her.D．Dr. Smith may not be a good choice.
A．Dr. Smith’’s waiting room isn’’t tidy.
B．Dr. Smith enjoys reading magazines.
C．Dr. Smith has left a good impression on her.
D．Dr. Smith may not be a good choice.
单项选择题
Living outside the university has more advantages than disadvantages.
A．Y
B．N
C．NG
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