Lesson50课件
日期：2010-12-02 12:10
540morebabies5beborn6goon7hourafterhour8producefood9forover370，Unit13Theworld’spopulationLesson50Standingroomonly1Doyouthinktheworld’spopulationistoobig?Whyorwhynot?2Whatcanbedonetoslowdownthepopulationincrease?standingroomonlyduringthattime3increaseby2594over15，000moremouths10Multiplythisby36511inoneyear12inahundredyears13theincreasingpopulation14thegreatestchallenge15growfasterandfaster16twothousandyearsago17fourhundredyearsago18atthebeginningofthetwentiethcentury19in197020in199021atthebeginningofthe21stcentury22bytheyear201023inabout600years24onehalftoonesquaremetreofspace25Therewillbehardly…26enoughspace，
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