新概念青少版3A_Unit11_Turn_it_down

1、Unit 11 Turn it down!Unit 11 Turn it down!Do you like Do you like themthem? ?你对分贝了解多少？分贝（decibel）,分贝是以美国发明家亚历山大格雷厄姆贝尔（英国人，后移居美国）命名的，他因发明电话（1875年贝尔制成了实用的电话装置，1876年建起了世界上第一家电话公司。）而闻名于世。你知道一个声音与另一个声音结合时，会产生什么结果吗？我们都知道60个苹果加60 个苹果，等于120个苹果。但是，这并不适用于以分贝来表示的声音。事实上，60分贝加60分贝只等于63分贝。分贝对人的影响有什么？ 1020分贝几乎感觉不到

2、。 非常安静的房间,1米外一根别针从1厘米的高度掉落 下来的声音 2040分贝相当于轻声说话。 20分贝：乡村的夜晚 30分贝：沙漠的夜 4060分贝相当于室内谈话。 6070分贝有损神经。 70分贝是认定的人类能忍受（不产生听力损失、睡眠障碍、焦虑、学习障碍等）的最大噪音 7090分贝很吵。长期在这种环境下学习和生活，会使人的 神经细胞逐渐受到破坏。 90100分贝会使听力受损。 100120分贝使人难以忍受，几分钟就可暂时致聋。 维塔斯的高音是105分贝，而飞机起飞时螺旋桨发出的声音才 110分贝！loud adj. 大声的，喧闹的turn it down 把.关小，调低interrupt

3、 v. 打断hearing n.听觉sound n. 声音，响声deaf adj. 聋的limit n. 限度，极限decibel n. 分贝（音量单位）continuous adj. 连续不断的sudden adj. 突然的damage n. 损害nightclub n. 夜总会MP3 player n. MP3播放器experience v. 经历，体验if adv. conj. 如果unlucky adj. 不幸的，倒霉的for ever adv. 永远level n. 水平fail v. 没有通过（考试）it doesnt matter 没关系 hire v. 租用accident n

4、. 事故ambulance n. 救护车robbery n. 抢劫fire n. 火灾，失火fire service n. 消防署，消防队thief n. 贼，小偷prison n. 监狱apologize v. 道歉a day off 休息一天pop concert n. 流行音乐会Lucy: Dad, that musics loud! Turn it down!William: Sorry, Lucy! Am I interrupting your homework?Lucy: Its not that, Dad. We had a lesson today about hearing.

5、 Look at this.1. interrupt & interruption n. e.g: He tried to speak, but she interrupted errupt 是打断的意思，主要打断别人正在进行的事情，如谈话，或者工作。disturb是打扰的意思，主要是打扰别人休息。bother是烦扰的意思，主要是指在某一时间段里，持续打扰别人并使别人烦恼。2. that, 代词，指代前面的一整句。 One person in seven in the UK is deaf, and many of them are deaf because of noi

6、se. For most people, the safe limit is 85 decibels(dB) for continuous noise, and 103 dB for sudden noise. After fifteen minutes at 105 dB, most people will have some damage to their hearing.1. One person in seven in the UK is deaf 谓语动词用单数，两个in分别表示时间和地点，不做主语。2. because of，of为介词，后跟名词。e.g: Im here beca

7、use of you.because conj. 其后接原因状语从句或回答以why开头的问句；e.g: Because he is ill, he is absent today.3. decibel 复数：decibels Music in nightclubs is often much louder than the safe limit.19% of young people listen to their MP3 players at 105 to 110 dB for many hours. 75% of them will experience ringing in the ea

8、rs,and they will feel a bit deaf. If they are lucky, this will last for one or two days. If they are unlucky, the damage will last for ever.1. much louder, 通常用much修饰形容词或副词的比较级，表示.得多。 e.g: We will be a much better football team next year.2. experience n.经验，（不可数名词）；经历 vt.亲身参与，亲身经历；感受；发现e.g: He has als

9、o had managerial experience on every level.Lucy: Youre always listening to loud music, Dad. If you arent careful, youll become deaf.William: Sorry, Lucy! What did you say?Lucy: Oh, Dad! It isnt funny!William: Of course it isnt. And I will turn the sound down. I promise!1. promise （v. 允诺，许诺） to do st

10、he.g: He promised to help us. I cant give you the book because Ive promised it to Susan. n. 许诺；希望，指望；允诺的东西e.g: Give me your promise that youll never be late again. 2. 与turn相关的词组turn down 降低音量 turn up 开大音量turn on 打开 turn off 关闭If they are lucky, this will last for one or two days. 在由if引导的条件状语从句中，我们遵循主将从现的原则。即：主句用一帮将来时，从句用一般现在时。e.g: If it is fine tomorrow, we will go outing.在时间状