北師大版選修七Unit 21 human biology Lesson 3 Epidemics Explained學(xué)案1.docx

unit 21 lesson 3 epidemics explained學(xué)案epidemics throughout history 第二課時(shí)教學(xué)目標(biāo)（objectives）1. 分析長(zhǎng)難句，理解課文。2. 掌握重點(diǎn)詞匯，短語(yǔ)和句型。情感態(tài)度了解傳染病對(duì)人類的危害，進(jìn)一步認(rèn)識(shí)良好生活習(xí)慣的重要性。重點(diǎn)和難點(diǎn)：1.識(shí)別課文結(jié)構(gòu)，用自己的話歸納信息。2.分析課文中的長(zhǎng)難句，提高閱讀能力教學(xué)方法task-based approach 教具dictionary, multimedia and blackboard教學(xué)過(guò)程step1 greetings and the daily routinegreet the whole class .let them read the encouraging sentence on the blackboard together twice.regret is just a waste of time.it neither changes the past nor creats the future.so work hard now.step2 check the new words in this passagedicate new wors of this passage.(we have leant and recite the new wors early in the morning.)let two volunteers write on the blackboard.step3 學(xué)習(xí)重點(diǎn)詞匯和短語(yǔ)，分析長(zhǎng)難句first,work in groups to learn some useful phrases and translate some sentences.1wipe out(1)徹底摧毀；消滅the plague once could wipe out a village.鼠疫曾一度可以?shī)Z走整村人的生命。(2)擦凈；擦掉wipe out the bath before you use it.使用浴盆前先把里面擦洗干凈。these stains wont be easily wiped out.這些斑點(diǎn)不易去掉。2as long as(1)只要，如果ill stay in mexico as long as my money holds on.只要我的錢還能維持一天，我就在墨西哥待一天。well go as long as the weather is fine.只要天氣好我們就去。(2)既然，由于as long as there is a demand for these drugs, the financial incentive for drug dealers will be there.既然對(duì)這些毒品有需求，對(duì)販毒者的金錢誘惑就存在。(3)(時(shí)間)長(zhǎng)達(dá)he lived abroad as long as five years.他住在國(guó)外長(zhǎng)達(dá)五年之久。3die of 死于(疾病、過(guò)度悲傷等)people are dying of cancer more and more often.死于癌癥的人越來(lái)越多了。my grandmother died of grief soon after her husbands death.祖父去世不久，祖母就因悲傷過(guò)度而死。be dying for.渴望be dying to do sth. 渴望做某事die off 相繼死亡(先后死去)die out (種族、家族等)滅絕；消失4stop sth. in its tracks 終止；消滅we must take action to stop water pollution in its tracks.我們必須采取行動(dòng)終止水污染。francis felt he would like to stop this conversation in its tracks.弗朗西斯認(rèn)為他應(yīng)該立刻停止這場(chǎng)談話。5be harmful to 對(duì)有害chemicals are harmful to the environment.化學(xué)制品對(duì)環(huán)境有害。smoking is harmful to your health.吸煙對(duì)你的身體健康有害。6having killed up to 50 million people in 18 months, with a tendency to strike the young and fit rather than the old, the spanish flu is believed to have been the most acute epidemic in history.西班牙流感在18個(gè)月的時(shí)間里奪去了5,000萬(wàn)人的生命，該病似乎傾向于襲擊年輕力壯的人，而非上了年紀(jì)的，它被認(rèn)為是歷史上最嚴(yán)重的一次傳染病。本句是一個(gè)簡(jiǎn)單句。having killed.18 months 為動(dòng)詞ing 短語(yǔ)，在句中作原因狀語(yǔ)。with.rather than the old為介詞短語(yǔ)作伴隨狀語(yǔ)。not knowing her address, i cant write to her.由于不知道她的地址，我沒(méi)法給她寫信。second,do some exercises in class to practice the