单项选择题

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
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单项选择题
According to the writer, we communicate with animals in an attempt to ______.
A．set up a relationship with them
B．make them do what we want
C．get along well with them
D．teach them a language
单项选择题
According to the writer, when man finds it impossible to live together with other species, he usually ______.
A．tries to communicate with them
B．tries to teach them a language
C．sets up a relationship with them
D．wipes them out
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