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
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
单项选择题
Which statement is not mentioned in the passage
A．Tips are not usually included in the total check.
B．A 15 percent tip in large cities indicates satisfactory service.
C．People tip waiters and waitresses.
D．People always put tips on the table.
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