单项选择题

Keep in ______ that all people are different and some may progress faster than others.

A．head
B．brain
C．heart
D．mind
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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
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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