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1、Unit 21 Human BiologyLesson 3 Epidemics ExplainedLook at the Key Words. Which of these diseases can be epidemic?AIDSCancerHeadacheFluHeart diseaseStomachacheTBEpidemics: Work in pairs. Do you think these statements are true(T) or false(F)?1.TB and flu kill millions of people every year.2.Most of dis
2、eases are very new.3.Epidemics have affected historical events.4.It takes years for a disease to spread world wide.5.Epidemics can wipe out up to half of the population in highly populated areas.6.More people died of a flu epidemic in 1918/1919 than died in World War I.Sequencing of in formation:1.r
3、ead the text with gaps to get the general idea and see how it develops.2.Read the sentences before and after the gaps to give you an idea of what the beginning or end of the missing paragraph might refer to.3.Read the missing paragrapphs and look for these references.4.If a paragraph doesnt seem to
4、fit, you may have made a mistake, so carefully reread each paragraph. Now use the strategies to match the five paragraphs (A-E) with gaps 2,4,7,9 and 11 in the text.The answers:Paragraph AParagraph BParagraph CParagraph DParagraph EGap 2Gap 4Gap 7Gap 9Gap 11 Complete these sentences about the text i
5、n your own wordsHow did you feel after reading the article?Tell the classVoice your opinion:Language points1.epidemics explained解释传染病 epidemics n.流行传染病, 时疫. (风尚等的)流行; (流行病的)蔓延 adj.传染流行性的 cholera epidemic霍乱流行 mass epidemic大流行; 集体流行Eg. Violence is reaching epidemic levels.暴力达到了流行的程度。 2.epidemics throu
6、ghout history历史上的传染病病例 throughout prep.遍及, 贯穿 adv.到处, 始终, 全部Eg. The road is kept open throughout the year.这条路全年开通.3.with new health threats on the rise.对人类健康造成威胁的因素在不断增加。 rise n.上升, 增加, 上涨, 高地, 小山, 发生, 出现 vi.升起, 起身, 发源, 起义, 高耸, 增长, 上升, 复活 vt.使飞起 4.look at v.看, 考虑, 着眼于;回顾5.Bacteria and viruses have b
7、een around since the beginning of life on earth自从地球上有了生命,便有了各种细菌和病毒.6.as long as只要, 在.的时候;既然;以为条件Eg. You may borrow this book as long as you promise to give it back. 只要你答应归还，你就可以把这书借走。 As long as youve offered, I accept.既然你已给我，我就接受. I will cooperate as long as I am notified on time.只要及时告诉我，我就会合作. 7.
8、as early as 430 BC早在公元前430年 as early as早在8.on record adv.记录在案, 公开宣布的;记录下来的Eg. the coldest winter on record有记录以来最冷的冬天9.attempt to do sth. attempt n.努力, 尝试, 企图 vt.尝试, 企图Eg. The boys attempted to leave for camping but were stopped by their parents. 男孩子们想去野营但被他们的父母们拦住了。 She made an attempt to cook the d
9、inner.她试着做这顿饭。10.sweep through sweep v.扫, 打扫, 清扫, 席卷, 冲光, 扫过, 掠过Eg. The wind swept over the plain.疾风横扫平原11.die from the disease (病以外病以外)因某事而死因某事而死Eg. Every winter some old people die from hypothermia. 每年冬天都有些老人死于体温过低。每年冬天都有些老人死于体温过低。12.be known as v.被认为是被认为是;以以.知名知名; 被认为是被认为是; 称为称为 be known for 因因.而
10、著名而著名 be known to 为为.所知所知13.a lack of （常与（常与of连用）缺乏；需要连用）缺乏；需要 a lack of money 缺乏金钱缺乏金钱 There is no lack of vegetable.蔬菜不缺。蔬菜不缺。14.provide the perfect conditions for. provide for v.提供生活费提供生活费; 养活养活; 为为.作准备作准备, 防备防备;规定规定 provide for old age防老防老15.in highly populated areas 在人口密集的地区在人口密集的地区16.one half
11、to one third of the population was lost to the Black Death 有三分之一到一半的人死于黑死病有三分之一到一半的人死于黑死病. be lost to不再属于不再属于.所有所有;对对.无动于衷无动于衷17.it is believed to be被认为是被认为是18. die of the flu 死于死于, 因因.而死而死 .die in the war19.begin with 首先首先, end with 以以.结束结束Eg. Knowledge begin with practice.认识从实践开始。认识从实践开始。 to begin
12、 with首先；第一点（理由）首先；第一点（理由）Eg. We cant go. To begin with, its too cold. 我们不能去。首先，天太冷了。我们不能去。首先，天太冷了。 end up with 以告终以告终Eg. He ended his letter off with good wishes to his friend. 他给朋友的信以祝好这句话结束。他给朋友的信以祝好这句话结束。 The meeting ended up with the singing of The Internationale. 会议最后以唱会议最后以唱国际歌国际歌而结束。而结束。20.th
13、e number of 总数；总和总数；总和 作为一个集合名词，作为一个集合名词， number既可以跟动词单数形式也可以跟动词复数形式。既可以跟动词单数形式也可以跟动词复数形式。 当它前面是定冠词当它前面是定冠词 the时，后跟单数动词时，后跟单数动词.Eg. The number of skilled workers is small.熟练工人数较少。熟练工人数较少。 A number of the workers are unskilled.许多工人技术不熟练许多工人技术不熟练21.such as adv.例如例如.,象这种的象这种的;诸如诸如., 譬如说譬如说; 象象.那样的那样的;
14、如此如此.以致以致Eg. such things as iron, silver, and gold铁、银和金这一类东西铁、银和金这一类东西22.natural defences against the disease 对抗这种病的自然抗体对抗这种病的自然抗体23.be harmful toEg. Smoking can be harmful to your health.吸烟对身体有害。吸烟对身体有害。24.make up v.弥补弥补, 虚构虚构, 缝制缝制, 整理整理, 包装包装, 和解和解, 编辑编辑, 化妆化妆;补足补足,拼凑拼凑Eg. She made up her face to
15、 look prettier. 她把脸化了妆以便看上去漂亮些。她把脸化了妆以便看上去漂亮些。 The boy made up a story; it was not true. 男孩编了个故事，这故事不是真的。男孩编了个故事，这故事不是真的。 make up a bed整理床铺整理床铺25.expand across expand vt.使膨胀使膨胀, 详述详述, 扩张扩张 vi.张开张开, 发展发展Eg. The bird expanded its wings and flew off.鸟展开翅膀飞走了鸟展开翅膀飞走了 expand ones view阐述自己的观点阐述自己的观点 Match
16、 the words from the passage(1-10)with their meanings(a-j)1.Effects2.Abnormal2.Physician4.Harmful5.Staff6.Aspect7.Expand8.Techniques9.Accounts10.acquirea)Doctorb)Badc)Getd)Parte)Growf)Resultsg)Resultsh)Unusuali)Waysj)workers Find the correct prepositions to complete each of these phrases from the tex
17、t1.the beginning life Earth(para.1)2.25% and 50% the areas population died the disease(para 3)3.was one the key causes the fall the Roman Empire(pare 3)4.struck the end the first World War and continued the war.(para 6)Answers:1.of,on2.of,from3.of,of,of4.near,of,afterWork in pairs. Which of these things do you think will happen within the next 25 years?1.New drugs will stop all diseases.2.Doctors will find a cure for SARS.3.Flu will disappear.4.AIDS will cause large epidemics.copy the new words 同学们来学校和回家的路上要注意安全同学们来学校和回家的路上要注意安全
