module5alessoninlab单元教案（外研版必修1）

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1、ModuIe5AlessoninalabPeriod1Teachingaims:1.Letthestudentsknowsomewordsrelatedtoexperiments,thelabandsomethinglikethat2.Reviewtheusageofnumbers/fractions/percentages3・KnowsthaboutDegreesofcomparison.Teachingsteps:I.Allofushavelearnedphysics,biologyandchemistryinmiddleschool.Nowle

2、t^shaveatesttoseehowmuchyouknow.DealwithActivity1onpage41・Choosethecorrectanswerstothequiz.Nowplaythetapeforthestudentstolistenandchecktheiranswers.Answers:1a2a3a4a5b6b7bII.FirstreadthewordsandthenaskthesstotranslatethemintoChinese.Atlastputtheminpairsorgroups.Answers:air-gas-o

3、xygencontract-expandearth-sun-moongas-liquid-solidIII..Answerthequestions・Answers:1）Electricity,iron,somemetalsandairarenatural2）Steel,somemetalsandglassareman-made3）Electricityandsomemetalscanbeman-madeandoccurnaturallyIV.Turntopage42.Activity1Readthenumbers・Payattentiontothep

4、ositionoftheword“ancT.V.Fractions.基数词+序数词，当分子大于1吋，分母要加S作主语时，谓语动词要根据of后面的名词决定。Answers:two-fifthsfive-eighthsnine-tenthsthree-eighthsfive-sixthsVLPercentages基数词+percent/percent注意：percent7k远单数形式作主语时，谓语动词要根据of后面的名词决定。VII.Degreesofcomparison1&2英语倍数表达法用英语表达”A是B的N倍长（宽，高，大，重等）“，”A比B长（宽

5、，高，大,重等）N倍“或“A的长度（宽度，高度，大小，重量等）是B的N倍”，可用下列儿种句型。l."A+be+倍数+as+计量形容词原级+as+B”.Thistreeisthreetimesastallasthatone.这棵树是那棵树的三倍高。Hisfatheristwiceasoldashe.他父亲的年纪有他两倍大。2.”A+be+倍数+计量形容词比较级+than+B"TheYangtzeRiverisalmosttwicelongerthanthePearlRiver.长江差不多比珠江长两倍。Thedictionaryisexactlyfive

6、timesmoreexpensivethanthatone.这本字典比那本恰好贵5倍。3.“A+be+倍数+the+计量名词+of+B”Thenewlybroadenedsquareidfourtimesthesizeofthepreviousone.新扩建的广场是未扩建时的四倍大。4・”The+计量名词+of+A+be+倍数+that+of+BnThesizeofthenewlybroadenedsquareisfourtimesthatofthepreviousone.新扩建的广场为以前的四倍大。5•其它I'mtwice/doublehisage

7、.我的年龄是他的两倍。I'vepaidfivetimestheusualpriceforthestamp.我出了5倍于往常的价格买这枚邮票。Theaverageincomeofthestaffhasbeenincreasedby50percentcomparedwithlastyear.与去年相比，该单位职工的收入增加了50%.ThepriceofTVsaretwofold（adj.两部分的，双重的）downover（heseyears.近儿年来，电视机的价格下降了两倍。the+比较级，the+比较级意为“越……，越……覽前面部分是从句，后面部分是主

8、句。Theharderyouwork,themoresuccessfulyouwillbe.Theearli