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A Hundred Years from Now Some people are pessimistic when......

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单项选择题
Why do pet dogs love performing tricks for their masters
A．To show their willingness to obey.
B．To show their affection for their masters.
C．To avoid being punished.
D．To win leadership of the dog pack.
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The third stage of NREM is the time when you dream.
A．Y
B．N
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