第1题: [单项选择]The purpose of this passage is ______. A. to give advice as to how to prevent hearing loss B. to define the effects of noise on human behavior C. to warn people of the danger of noise pollution D. to tell the difference between noise and sound 参考答案:B 答案解析:[精解] 这又是一个推断文章主旨的题。[A]有两个方面不对:advice和how to prevent hearing loss不是作者所要突出讨论的问题。[D]的信息是提及了,但不是全文的中心议题