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Module5AlessoninalabTeachingaims:Enablingthessto1.knowsomewordsrelatedtoexperiments,thelabandsomethinglikethat2.reviewtheusageofnumbers/fractions/percentages3.knowsthaboutDegreesofcomparison.Teachingsteps:I.Allofushavelearnedphysics,biologyandchemistryinmiddleschool.Nowlet’shaveatesttoseehowmuchyouknow.DealwithActivity1onpage41.Choosethecorrectanswerstothequiz.Nowplaythetapeforthestudentstolistenandchecktheiranswers.Answers:1a2a3a4a5b6b7bII.Activity2.FirstreadthewordsandthenaskthesstotranslatethemintoChinese.Atlastputtheminpairsorgroups.Answers:air-gas-oxygencontract-expandearth-sun-moongas-liquid-solidIII.Activity3.Answerthequestions.Answers:\n1)Electricity,iron,somemetalsandairarenatural2)Steel,somemetalsandglassareman-made3)Electricityandsomemetalscanbeman-madeandoccurnaturallyIV.Turntopage42.Activity1Readthenumbers.注意：and的位置billion,million,thousand,and------V.Fractions.基数词+序数词，当分子大于1时，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-sixthsVI.Percentages基数词+percent/percent注意：percent永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，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"，可用下列几种句型。\n1."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。
Thedictionaryisexactlyfivetimesmoreexpensivethanthatone.
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+B"
Thesizeofthenewlybroadenedsquareisfourtimesthatofthepreviousone.
新扩建的广场为以前的四倍大。5.其它
I'mtwice/doublehisage.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。\n
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)downovertheseyears.
近几年来，电视机的价格下降了两倍。the+比较级……，the+比较级……意为“越……，越……”。前面部分是从句，后面部分是主句。 Theharderyouwork,themoresuccessfulyouwillbe.Theearlieryoucome,thebetterplaceyoucanfind.“比较级+and+比较级”表示“越来越……”。Hebecomesfatterandfatter．比较级前还可以用much，even，still，alittle等来修饰。VIII.Dealwiththeexercisesonpages45,46and47
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