单项选择题

Paul Moller's flying car is different than an airplane because （）

A．it has no wings
B．it uses solar power
C．it takes off and lands vertically
D．it can land on water

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单项选择题
Robert Fulton's invention, an airphibian, can best be described as （）

A．a helicopter
B．a solo flying machine
C．a flying car
D．an airplane
单项选择题
Jet belts and rocket belts were developed （）

A．20-30 years ago
B．50 years ago
C．recently
D．30 years ago
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