单选：动物们在活动时常常忘不了竖起耳朵，并且还不时地转动着方向，这是因为（）.A．向其它动物示威B．判断声源C．动物的一种习惯动作D．赶小虫

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题目内容：

动物们在活动时常常忘不了竖起耳朵，并且还不时地转动着方向，这是因为（）.
A．向其它动物示威
B．判断声源
C．动物的一种习惯动作
D．赶小虫

参考答案：【答案仅供学习，请勿对照自行用药等】

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