单项选择题

A．To defend its territories.
B．To attract the attention of other birds.
C．To warn other birds.
D．To pronounce that it has occupied the place.
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单项选择题
A．You might feel lonely and unhappy at first.B．You may waste a lot of time.C．You have to leave your children.D．None of the above.
A．You might feel lonely and unhappy at first.
B．You may waste a lot of time.
C．You have to leave your children.
D．None of the above.
单项选择题
A．What subject Dr. Duncan teaches.B．If she resembles Dr. Duncan.C．What kind of teacher Dr. Duncan is.D．What kind of classes the man wants to take.
A．What subject Dr. Duncan teaches.
B．If she resembles Dr. Duncan.
C．What kind of teacher Dr. Duncan is.
D．What kind of classes the man wants to take.
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