题目

阅读下列短文，从每题所给的四个选项（A、B、C或D）中，选出最佳选项。 Some time ago I discovered that one of my chairs had a broken leg. I didn't think there would be any difficulty in getting it mended, as there are a whole lot of antique（古董）shops near my home. So I left home one morning carrying the chair with me. I went into the first shop expecting a friendly reception. I was quite wrong. The man wouldn't even look at my chair. The second shop, though slightly more polite, was just the same, and the third and the fourth—so I decided that my approach mu减弱噪声的途径有三条：在 ______减弱噪声，如在汽车排气管上加消声器；在 ______减弱噪声，如在路旁种植树木；在 ______减弱噪声，如戴上耳塞．