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【单选题】
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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根据网考网移动考试中心的统计,该试题:
34%
的考友选择了A选项
0%
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60%
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6%
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