单项选择题

A．To exercise the jaw muscles.
B．To eliminate fatigue.
C．To get greater strength for attacking.
D．To gain more oxygen.
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单项选择题
A．When they are swimming.B．When they are quarreling.C．When they are socializing.D．When they are eating.
A．When they are swimming.
B．When they are quarreling.
C．When they are socializing.
D．When they are eating.
填空题
You tend to assume that your destination is less
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