单项选择题

A．Working too long.
B．Accumulated stress.
C．Bad sleeping habits.
D．Anti-social lifestyles.
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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.
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.
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