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【单选题】Ultralight (超轻型的) airplanes are a recent development in aviation that provide what aviation enthusiasts have long been seeking: born of the marriage of the hang glider and the go-kart (轻型单座赛车) engine ...
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 Octave Chanute
D.
the controls used in the Wright brothers’ flyer and those used in today’s ultralight air-planes