单项选择题

The main idea of the third paragraph is stated in the ______.

A．first sentence
B．second sentence
C．third sentence
D．last sentence
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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
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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