单项选择题

A. Careers in environmental engineering.
B. A way to improve fuel efficiency in buses.
C. The causes of air pollution.
D. A new fuel for buses.
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The passage aims to tell parents some secrets on how to help their child become an outstanding student.
单项选择题
A. In a park. B. At a restaurant. C. In a barbershop. D. In the market.
A. In a park. B. At a restaurant.
C. In a barbershop. D. In the market.
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