单项选择题

During daylight hours, birds ______.

A．fly aimlessly
B．rely on landmarks
C．use sun for guidance
D．are more likely to get lost
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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
单项选择题
You had better go there by train, ______.
A．don't you
B．won't you
C．hadn't you
D．aren't you
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