单项选择题

The passage deals mainly with ______.

A．automobiles
B．transportation
C．roads
D．vehicles
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单项选择题
The best title for the passage is ______.
A．"Traveling Becomes Easier"
B．"The Invention of the Wheel"
C．"The Stagecoach in America"
D．"The Importance of Wheel"
单项选择题
By his outdoor cousins the author means ______.
A．other experimenters
B．the other doves of the same brood
C．doves under the natural sky
D．other birds in general
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