单项选择题

A．Yawning results from fatigue or boredom.
B．Other animal yawn for the same reason as humans.
C．Animals yawn for a number of different reasons.
D．Only social animals yawn.
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单项选择题
A．She is quite disappointed.B．She is humorous.C．She is furious.D．She is depresse
A．She is quite disappointed.
B．She is humorous.
C．She is furious.
D．She is depresse
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