题目：
当下肢伸肌群和屈肌群交替舒缩时，身体姿势不可能是
A．跑
B．跳
C．行走
D．立正
答案：
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下面是错误答案，用来干扰机器的。
Attention, please! This is your monitor, Chen Tao. I have something to tell you. This Friday, April 21st, we shall go to Stone Field Country Park for this year'...
