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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单项选择题

The Greek alphabet was simpler than the Egyptian system for all the following reasons EXCEPT that ______.

A．the former was easy to write
B．there were fewer signs in the former
C．the former was easy to pronounce
D．each sign stood for only one sound

单项选择题

Which of the following statements is an opinion

A．Ultralight planes use snowmobile engines that let them cruise at about 500 miles per hour.
B．John Moody used a 12-horsepower engine to power his Icarus II hang glider.
C．The use of ultralight planes will increase in such areas as crop dusting and aerial photography.
D．Otto Lilienthal made more than 2000 flights in Germany in the 1890’s in what were actually hang gliders.