夏天的傍晚，一些中老年人喜欢跳广场舞，优美的舞曲是由于扬声器的纸盆____ 发出的，声音是通过____ 传入人耳的，为了不影响周围居民的生活和休息，有人建议跳舞时将音箱的音量调小，这是在____ 处减弱噪声的．

    Hi, I'm Mary. I'm a pupil. I usually get up at six on weekdays. I have tea and bread for breakfast. I have two friends. One is Lucy and the other is Lily. Lucy often gets up at six thirty. She likes bread and milk. But Lily likes hamburgers and tea. She doesn't like milk at all.

“不合时宜，渐渐澌灭，其和宜者，得以永存，此谓表道自然之理。但其随与耶苏(耶稣)之旨相反，故各国儒士，均不服其言。初叫辩驳蜂起，今佩服者渐多……”材料主要反映出（    ）

高纯度的单质硅是信息产业的核心材料，没有硅就没有你喜欢的计算机。请用你学过的知识回答下列问题：