初中英语课件,此ppt下载后可自行编辑,Module 5 A Lesson in a Lab,Electronic devices(装置)are changing the way people listen to music. But studies show the devices may be causing hearing loss in many people. Some experts say people may be playing them too loud and for too long. And experts say sound levels on these devices need to be set lower.,Researchers did a study with three hundred high school students and one thousand adults. They were asked about their use of portable music devices. Forty percent of the students and adults said they set the sound levels at high on their players. But students were twice more likely to play the music at a very loud volume(音量)More than half of the students said they would probably not limit their listening time. The study found that more than half of the students and less than forty percent of the adults had at least one kind of hearing loss. Some reported difficulty hearing parts of a discussion between two people.,Others said they had to raise volume controls on a television or radio to hear it better. And，some experienced ringing in their ears or other noises. Hearing experts say part of the problem is the listening equipment people are using. They say large earphones that cover the whole ear are probably safer than the smaller earbuds(耳塞)that come with most music players. Hearing loss may not be obvious for years，however，once it happens，there is few chance of curing.About thirty million Americans have some hearing loss. One third of them lost their hearing as a result of loud noises.,The American SpeechLanguageHearing Association is working with companies and government officials on setting rules for use of portable music devices. The group says the best way to protect your hearing is to reduce the volume，limit listening time and use ear phones that block out foreign noises.,1佳句仿写一二三 我不喜欢他和妈妈说话的方式。 _ 多于30%的委员会成员说他们反对这项计划。 _ _,I dont like the way he talks to his mother.,More than 30 percent of the members of the committee said they were against the plan.,2翻译佳句，放眼高考 Hearing loss may not be obvious for years，however，once it happens，there is few chance of curing. _ _,听力损伤也许多年都不被察觉(表现不明显)，但它一旦发生，就几乎没有治愈的机会。,Period One Introduction，Reading and Vocabulary,单词识记 1_/lIkwId/ n液体 2_/Ikspnd/ vi.膨胀 3_ /kntrkt/ vi.收缩 4_/sbstns/ n物质 5_/mIkst/ n混合物 6_/ksIdn/ n氧气,.,liquid,expand,contract,substance,mixture,oxygen,7electricity /I lektrIsItI/ n. _ 8stage /steId/ n_ 9conclusion /knklu：n/ n_ 10. aim /eIm/ nv._ 11. reaction /rIkn/ n. _ 12. electrical /IlektrIkl/ adj. _,电,阶段,结论,目标，目的,反应,用电的；与电有关的,短语天地 1_大众科学 2_在的顶部 3_在的底部 4_使有条理 5_得出结论 6two thirds_ 7for example_ 8do/ make an experiment_ 9a mixture of_ 10think of_,.,public science,at the top of,at the bottom of,put.in order,draw /reach /come to /arrive at a conclusion,三分之二,例如,做试验,的混合物,想起；考虑,语境助记 Recently we made an experiment. Our aim is to test if a substance expands when hot and contracts when cold. At the first stage, we prepared some materials for the experiment, such as a cup of liquid, a nail and electricity. We put everything in order. We designed a table. At the top of table is some instructions about the experiment. About two thirds of the students did the experiment. At last we arrived at a conclusion and write it down at the bottom of the table.,.,.句型搜索 1It is hard to think of a world without metals. 信息提取 it作形式主语，不定式作了真正的主语。 例句仿写 很难想象一个没有电的世界。 _for us_a world without electricity. 2Twothirds of the earths surface is water. 信息提取 考查主谓一致和分数的表达法， of后面的词是单数或不可数名词时，谓语动词要用单数。 例句仿写 我们班五分之三的学生是女生。 _of the students in our class_girls.,to think of,It is hard,Three fifths are,3. Below is a description of a simple scientific experiment. 信息提取 本句是倒装，主语为a description, is below 是系表结构。 例句仿写 下面是我们即将讨论的问题。 _that we are to discuss.,Below are the questions,预读理解 1Choose the best answer. (1)Which of the following metals reacts the most with water? ACopper. BIron. CAluminium. DSodium. (2) When heated in oxygen，_will react partially. Azine Bcopper Cpotassium Dall metals (3) According to the passage, it can be inferred that_will have less use in making kitchen tools. Aaluminium Biron Csteel Dcopper,.,(4)“Airfree water” means_. Aair with a lot of water Bair without a lot of water Cwater with a lot of air Dwater without air 答案 (1)D (2)B (3)A (4)D,2Read the passage again，and do the following exerci