单项选择题

A．Animals yawn for a number of reasons.
B．Yawning results only from fatigue or boredom.
C．Human yawns are the same as those of other animals.
D．Only social animals yawn.
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单项选择题
A．50 meters from the end.B．15 meters from the end,C．10 meters from the end,D．5 meters from the end.
A．50 meters from the end.
B．15 meters from the end,
C．10 meters from the end,
D．5 meters from the end.
填空题
In order to survive, we all put on a
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