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

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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

An analogy was used to compare the way one could fly in the Solo Flyer to ______.

A．how a helicopter flies
B．how the Jetsons fly
C．how the airphibian flies
D．how Superman flies

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