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
Doing more physical exercise helps consume extra calories and stay fit.
A．Y
B．N
C．NG
单项选择题
Eating too much salt can raise your cholesterol.
A．Y
B．N
C．NG
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