以下不属于消费者购买信号的是( )
A.表情信号
B.语音信号
C.干扰信号
D.行为信号
正确答案是C
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Passage 3 Questions 11 to 15 are based on the following passage The City of Melton has been awarded the UNESCO(联合国教科文组织) Learning City Award at UNESCO's 2nd International Conference on Learning Cit