单项选择题

A．Serious.
B．Not serious.
C．Not favorable.
D．Favorable.
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单项选择题
A．The bird had finally understood his threat.B．The bird managed to escape from the chicken house.C．The bird had learned to scream back at him.D．The bird was living peacefully with the chickens.
A．The bird had finally understood his threat.
B．The bird managed to escape from the chicken house.
C．The bird had learned to scream back at him.
D．The bird was living peacefully with the chickens.
单项选择题
A．Fierce competition.B．Network problems.C．High price.D．Government policy.
A．Fierce competition.
B．Network problems.
C．High price.
D．Government policy.
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