单项选择题

A．life
B．alive
C．living
D．live
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单项选择题
What physiological reason for yawning is mentioned
A．To exercise the jaw muscles.
B．To eliminate fatigue.
C．To get greater strength for attacking.
D．To gain more oxygen.
单项选择题
A．resultB．markC．impressionD．difference
A．result
B．mark
C．impression
D．difference
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