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
Jet belts and rocket belts were developed （）

A．20-30 years ago
B．50 years ago
C．recently
D．30 years ago
单项选择题
The Solo Flyer is able to lift off the ground by using （）

A．a solar powered engine
B．engine-powered twin fans
C．large flapping wings
D．rotating blades
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