题干
放鞭炮时用手捂住双耳，这是在____处减弱噪声的；在城市街道禁鸣喇叭，这是在____处减弱噪声.
答案(点此获取答案解析）
人耳,声源
because of the driver’s carelessness, was __________ and crashed over the cliff on such a cold December morning.