高中英语 Unit21 lesson3 epidemics explained课件 北师大版选修7.ppt

* * Unit 21 Human Biology Lesson 3 Epidemics Explained Look at the Key Words. Which of these diseases can be epidemic? AIDS Cancer Headache Flu Heart disease Stomachache TB Epidemics: 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 diseases 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.read 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 doesn’t seem to 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 A Paragraph B Paragraph C Paragraph D Paragraph E Gap 2 Gap 4 Gap 7 Gap 9 Gap 11 Complete these sentences about the text in your own words How did you feel after reading the article? Tell the class Voice your opinion: Language points 1.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 throughout 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 been around si