单项选择题

The best title for this passage is ______.

A．The Flying Snowmobile
B．The History of Recent Aviation
C．How the Ultralight Plane Flies
D．The Ultralight Plane, a Recent Development
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单项选择题
The author seems to feel that ultralight airplanes are ______.
A．a toy for the rich
B．nothing but hang gliders
C．a new development that meets the needs of aviation enthusiasts
D．the most important development in aviation since the Wright brothers' Flyer
单项选择题
The author finds great similarity between ______.
A．the weight of the hang glider and that of the ultralight airplane
B．ultralight airplanes and military aircraft
C．the inventiveness of John Moody and that of Dctave Chanute
D．the controls used in the Wright brothers' Flyer and those used in today’s ultralight airplanes
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