高中英語unit21lesson3epidemicsexplained課件北師大版選修(已修改)
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【正文】 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)? and flu kill millions of people every year. of diseases are very new. have affected historical events. takes years for a disease to spread world wide. can wipe out up to half of the population in highly populated areas. people died of a flu epidemic in 1918/1919 than died in World War I. Sequencing of in formation: the text with gaps to get the general idea and see how it develops. 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. the missing paragrapphs and look for these references. 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 (AE) with gaps 2,4,7,9 and 1
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