单项选择题

A．90 hours.
B．86 hours.
C．84 hours.
D．96 hours.
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单项选择题
The passage gives an overview of how Mad Cow Disease has affected the world in recent years.
A．Y
B．N
C．NG
单项选择题
A．2nd largest in the world.B．3rd largest in the world.C．4th largest in the world.D．5th largest in the world.
A．2nd largest in the world.
B．3rd largest in the world.
C．4th largest in the world.
D．5th largest in the world.
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