单项选择题

The second paragraph is mainly about ______.

A．the wheel in transportation
B．the roller in transportation
C．animals in transportation
D．very heavy loads
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单项选择题
The passage deals mainly with ______.
A．automobiles
B．transportation
C．roads
D．vehicles
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"
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