3、（1分）
The writer implies that the shepherd-sheepdog whistle language is still biased because ________.
A)
it can only be used to give orders
B)
it is not natural for both shepherd and sheepdog
C)
it is a one-way communication approach
D)
it can only be used between man and dog
出自：华北水利水电大学-工程测量技术-大学英语（2）
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