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1、根据本节教材用实验和猜测相结合的方法来说明生命起源的特点，教学方法也就选择学生观察投影片、猜测和查资料相结合的方法进行教学。有关保护环境的英语演讲稿 Wehaveonlyoneearth.Butnow,theenvironmentbecomesworseandworse. Asyouknow,there'snoenoughcleanwaterforpeople.Somanyofthemlosetheirlivesbecauseofwater.Inalotofcountries,peoplehavetocuttreesforliving.Sot
2、here'snothingtokeepwaterfromrunningaway.Alsowehavepollutedtheland,theriverandtheair.Sowehavetofacemoreandmorefloodsanddroughts. It'stimethatwemustdosomethingusefultoprotectourenvironment.Wecanplanttreesandtakegoodcareofthem.Wecansavethewaterandaskourparentstodoso.Wecan'tthro
3、wanylitterontothegroundandweshouldcollectthemforrecycling. Ifwetakegoodcareofourearthtoday,itwillbemorebeautifultomorrow. Weliveintheworldeveryday.Weeatfood,drinkwater,wearclothes,watchTV,usecomputersandsoon.Weareproducingwasteeverymoment. Generallyspeaking,therearefoursor
4、tsofwaste.意大利医生雷地证明腐肉不能生蛆的实验投影片，巴思德的“鹅颈瓶实验”投影片，原始地球的投影片，米勒实验的投影片。根据本节教材用实验和猜测相结合的方法来说明生命起源的特点，教学方法也就选择学生观察投影片、猜测和查资料相结合的方法进行教学。Theyarematerialwaste,organicwaste,inorganicwasteandpoisonous&harmfulwaste.Now,wearegoingtotalkabouteachsortofwasteonebyone. Materialwaste:itmeansthe
5、wasteofsubstanceorthingsfromwhichsomethingelsecanbemade.Forexample,peoplethrowawaytheusedmetalproductsandbuyanewone,sotheoldmetalwasteaccumulates.Atlast,theybecomewaste.Forexample,whenpeoplefinishreadingnewspaper,thepaperwillbecomewaste.Whentheglassisbroken,italsobecomeswaste
6、.Nobodywantstouseabrokenwindowordrinkwithabrokenglassorwearapairofbrokenglasses.Onceitisbroken,itbecomeswaste.Therateofusingplasticsisincreasingdaybyday.Peopleuseplasticbagsbecausetheyareconvenient.Whentheygethome,theythrowtheplasticsway,payingnoattentiontotheenvironment.Them
7、oreconvenienceplasticsbringstous,themoreplasticwasteisproduced.Thisiscalled“whitepollution”asmostplasticsarewhite.Someofourproductsweuseeverydayaremadeofrubber,justlikethetyresandthebottompartofourshoes.It’struethatrubberplaysanimportantroleinourlife.意大利医生雷地证明腐肉不能生蛆的实验投影片，巴思德
8、的“鹅颈瓶实验”投影片，原始地球的投影片，米勒实验的投影片。根据本节教材用实验和猜测相结合的方法来说明生命起源的特点，教学方法也就选择学
