单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．A new fuel for buses.
B．The causes of air pollution.
C．Careers in environmental engineering.
D．A way to improve fuel efficiency in buses.
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单项选择题
A．She hasn’t called the travel agency yet.B．The man may have to reschedule his trip.C．She doesn’t know when her semester ends.D．The man should take his vacation somewhere else.
A．She hasn’t called the travel agency yet.
B．The man may have to reschedule his trip.
C．She doesn’t know when her semester ends.
D．The man should take his vacation somewhere else.
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