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
In total darkness, doves ______.
A．use landmarks
B．don't know which way to fly
C．fly back home
D．wait for the stars to appear
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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