问题
填空题
车门车窗已关闭的汽车内的乘客几乎听不到外面的声音，这是从______途径减少噪声；市区内禁鸣喇叭是从______处减少噪声．
答案
由于车玻璃阻挡了噪声的传播途径，所以车内的乘客几乎听不到外面的声音；
市区内禁鸣喇叭属于在噪声的声源处减弱噪声；
故答案为：阻断噪声的传播，声源．
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车门车窗已关闭的汽车内的乘客几乎听不到外面的声音，这是从______途径减少噪声；市区内禁鸣喇叭是从______处减少噪声．
由于车玻璃阻挡了噪声的传播途径，所以车内的乘客几乎听不到外面的声音；
市区内禁鸣喇叭属于在噪声的声源处减弱噪声；
故答案为：阻断噪声的传播，声源．
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