未知题型
What is the author's attitude in this passage?
D.Humorous.
- A.PersuasivE.
B.Explanatory.
C.NarrativE.
【参考答案】
B
解析：这是一篇说明文，向读者介绍了几种接收讯息方法的共性和他们各自的特点。explanatory意为'解释性的'。
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