高中英语Unit21lesson3epidemicsexplained课件北师大版选修7[共29页]

Unit21HumanBiologyLesson3EpidemicsExplainedLookattheKeyWords.Whichofthesediseasescanbeepidemic?AIDSCancerHeadacheFluHeartdiseaseStomachacheTBEpidemics:Workinpairs.Doyouthinkthesestatementsaretrue(T)orfalse(F)?1.TBandflukillmillionsofpeopleeveryyear.2.Mostofdiseasesareverynew.3.Epidemicshaveaffectedhistoricalevents.4.Ittakesyearsforadiseasetospreadworldwide.5.Epidemicscanwipeoutuptohalfofthepopu...