单项选择题

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单项选择题
When are airplanes not fuel efficient
A. On short trips.

B. On long trips.
C. When flying over cities.

D. When flying at high altitudes.
单项选择题
Which countries sponsored the measure
A. France, Russia and the United States.
B. The United States, Britain and Russia.
C. France, Britain and the United States.
D. France, Britain and China.
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