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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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
单项选择题
The main idea of the first paragraph is that ______.
A．people traveled on lakes thousands of years ago
B．people used logs thousands of years ago
C．traveling was hard thousands of years ago
D．there were no roads and cars thousands of years ago
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