单项选择题

A．On short trips.
B．On long trips.
C．When flying over cities.
D．When flying at high altitude.
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单项选择题
According to Hartung, the toxicity tests used for tens of years are simply bad science.
A．Y
B．N
C．NG
单项选择题
A．Energy conservation.B．A new kind of transportation.C．Strip cities.D．Advantages of air transportation over rail roads.
A．Energy conservation.
B．A new kind of transportation.
C．Strip cities.
D．Advantages of air transportation over rail roads.
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