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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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
What is served before you order（）

A．Bread.
B．Butter.
C．Coffee.
D．Cold water.
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