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
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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
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
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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