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
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
单项选择题
The reason why birds don't get lost on long flights ______.
A．have been known to scientists for years
B．have only recently been discovered
C．are known by everyone
D．will probably remain a mystery
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