单项选择题

A．They know what to do because of instinct.
B．They know how to fly naturally.
C．They often reject their parents.
D．They learn behavior from their parents or other animals.
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单项选择题
A．His present whereabouts is unknown.B．He is somewhere in Bristol.C．He’s out of the town.D．Nobody knows.
A．His present whereabouts is unknown.
B．He is somewhere in Bristol.
C．He’s out of the town.
D．Nobody knows.
填空题
O
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