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．He is a commercial diver.B．He is an independent photographer.C．He is a camera manufacturer.D．Both A and B.
A．He is a commercial diver.
B．He is an independent photographer.
C．He is a camera manufacturer.
D．Both A and B.
单项选择题
A．She was approving.B．She was apologetic.C．She was annoyed.D．She was careless.
A．She was approving.
B．She was apologetic.
C．She was annoyed.
D．She was careless.
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