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解方程或解方程组
我们规定若关于x的一元一次方程ax=b的解为b﹣a则称该方程为差解方程例如2x=4的解为2且2=4﹣
解方程解方程+=1.
解方程.
规定若关于x的一元一次方程ax=b的解为b+a则称该方程为和解方程．例如方程2x=-4的解为x=-2
解方程组
解方程及不等式组解方程
我们规定若关于x的一元一次方程ax=b的解为b﹣a则称该方程为差解方程例如2x=4的解为2且2=4﹣
解方程:解方程:
我们规定若关于x的一元一次方程ax=b的解为b﹣a则称该方程为差解方程例如2x=4的解为2且2=4﹣
解方程组代入法及加减法两种方法解方程
解方程x²－2x－3=0
解方程或解方程组
解方程3x+1=7
下列解方程的过程中正确的是
x
2
＝－2，解方程，得x＝±
（x－2)
2
＝4，解方程，得x－2＝2，x＝4
4(x－1)
2
＝9，解方程，得4(x－1)＝±3，x
1
＝
，x
2
＝
(2x＋3)
2
＝25，解方程，得2x＋3＝±5，x
1
＝1，x
2
＝－4
理解同解方程的定义再解题1同解方程的定义为如果两个方程的解相同那么这两个方程叫同解方程反之如果两个方
马虎与粗心两位同学解方程组时马虎看错了m解方程组得粗心看错了n解方程组得试求:1常数mn的值;2原方
解方程:配方法解方程
我们规定若关于x的一元一次方程ax=b的解为b+a则称该方程为和解方程．例如方程2x=-4的解为x
某同学在解方程-1去分母时方程右边的-1没有乘以3因而求得方程的解为x=2试求a的值并正确的解方程．
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A Napogaisa12-year-oldgirlinGhana加纳Africa.Itishardforherfamilytogetcleanwater.Everymorningsheleaveshomeathalfpastfivetogetcleanwaterforherfamilyinavillagefaraway.Ittakeshersixhourstogetenoughcleanwaterfordaily日常的cookinganddrinking.Shehasnotimetogotoschoolortoplaywithherfriends.MillionsofpeopleintheworldarelikeNapoga.Theycan’tgetenoughcleanwatertokeephealthy. EarthDayisApril22.Butonallotherdayswemustalsorememberit.Thewaterweuseisthemostimportantnaturalresource自然资源ontheearth. Watercovers70%oftheearth’ssurface表面.Butmostofthatisseawater.Wecan’tuseitforverymanythings.Freshwatercoversonly1%oftheearth’ssurface. Youprobablyfeelluckythatyourlifeisn’tashardasNapoga’s.Butthatdoesn’tmeanyoudon’thavetoworryaboutwater.Weallfaceseriouswaterproblems.Oneofthemiswaterpollution.Allkindsofthingsfromcarsfactoriesfarmsandhomesmakeourriverslakesandoceansdirty.Pollutedwaterisverybadforpeopletodrink.Anddirtywaterisbadforfishtoo.Now34%ofallkindsoffisharedyingout. HowdocarsandfactoriesmakeourwaterdirtyFirsttheypollutetheair.Thenwhenitrainstherainwatercomesdownandmakesourdrinkingwaterdirty.Dirtyraincalledacidrain酸雨isalsobadforplantsanimalsandbuildings. Scientistssaythatin30yearsmorethanhalfofthepeopleintheworldwon’thaveenoughcleanwater.Wehavetolearnhowtosavemorewaterforourselvesandourchildren.Hereissomeadviceforsavingwater: Turnoffthewaterwhileyoubrushyourteeth.Youcansaveasmuchas450liters升eachmonth. Leakytaps水的龙头wastealotofwater.Fixthemrightaway! Youcaneasilycutyour1O-minuteshowers沐浴inhalf—andyou’llbejustasclean. Whenyouwashdishesdon’tletthewaterrun. Onlywashclotheswhenyouhavealottowash.Ifyourwashingmachineisn’tfullyou’rewastingwater! EverymorningNapogawenttogetcleanwater.
BWastecanbeseeneverywhereintheschool.Somestudentsaskformorefoodthantheycaneatandothersoftenforgettoturnoffthelightswhentheyleavetheclassroom.Theysaytheycanaffordthesethings.ButIdon’tagreewiththem.Wastecanbringalotofproblems.AlthoughChinaisrichinsomeresources资源weareshortof缺乏othersforexamplefreshwater淡水.Itisreportedthatwewillhavenocoal煤oroiltousein100years.SoifwegoonwastingourresourceswhatcanweuseinthefutureandwherecanwemoveThinkaboutit.Ithinkweshouldsaynotothestudentswhowastethingseveryday.Everybodyshouldstopwastingassoonaspossible.Inoureverydaylifewecandomanythingstopreventwastefromhappeningforexampleturnoffthewatertaps水龙头whenwefinishwashingturnoffthelightswhenweleavetheclassroomtrynottoordermorefoodthanweneedandsoon.Littlebylittleeverythingwillhechanged.Wastecanbestoppedonedayifwedoourbest.Whichisnotmentionedinthispassage
D PeopleoftensaythattheEnglishman’shomeishiscastle.Theymeanthatthehomeisveryimportantandpersonaltohim.MostpeopleinBritainliveinhousesratherthanflatsandmanypeopleowntheirhomes.Thismeansthattheycanmakethemindividual个体的;theycanpaintthemandchangetheminanywaytheylike.Mosthouseshaveagardenevenifitisaverysmalloneandthegardenisusuallyloved.Thehouseandthegardenaretheprivate私人的spaceoftheindividual. Peopleusuallyliketomarktheirspace.AreyousittingnowinyourhomeoronatrainHaveyoumarkedthespacearoundyourselfasyoursIfyouareonthetrainyoumayputyourcoatorsmallbagontheseatbesideyou.Ifyoushareaflatyoumayhaveonecornerorchairwhichisyourown. OnceIwastravellingonatraintoLondon.Iwasinasectionforfourpeopleandtherewasatablebetweenus.Themanontheoppositesidetomehadhisbriefcaseonthetable.Therewasnospaceonmysideofthetableatall.Iwasangry.Maybehethoughtthatheownedthewholetable.IhadreadabookaboutnonverbalcommunicationsoItookvariouspapersoutofmybagandputthemonhisbriefcase!WhenIdidthishestiffenedandhiseyesnearlypopped瞪出outofhishead.Ihadinvaded侵犯hisspace!AfewminuteslaterItookmypapersoffhiscaseinordertoreadthem.Heimmediatelymovedhiscasetohissideofthetable.Ofcourseitispossiblethathejustwantedtobehelpfultome! Ifyouarevisitinganothercountryyoumayfeelthatyoudon’thaveanyprivatespace.Hotelroomslookmuchthesameineverycountryintheworld.Alldaylongyousharepublicspaceswithotherpeople.Youseethelocalpeopleintheirprivatespacesandyoufeellonelyand"outside".Localpeoplecancreatetheirprivatespacesbytalkingaboutthingsyoudon’tknowabout.Andyouevenfeelthattheylikeyoutobeoutsidethemsothattheywillenjoybeinginsideevenmore!Thisisoneofthedifficultiesofbeingatraveller!Butifyouunderstanditthenithelpsyou.Haven’tyouenjoyedbeingpartofagroupand"owning"abitofspace WhichofthefollowingisTRUEaccordingtothepassage
It'sgoodfoodthatwealllikeitverymuch.
D PeopleoftensaythattheEnglishman’shomeishiscastle.Theymeanthatthehomeisveryimportantandpersonaltohim.MostpeopleinBritainliveinhousesratherthanflatsandmanypeopleowntheirhomes.Thismeansthattheycanmakethemindividual个体的;theycanpaintthemandchangetheminanywaytheylike.Mosthouseshaveagardenevenifitisaverysmalloneandthegardenisusuallyloved.Thehouseandthegardenaretheprivate私人的spaceoftheindividual. Peopleusuallyliketomarktheirspace.AreyousittingnowinyourhomeoronatrainHaveyoumarkedthespacearoundyourselfasyoursIfyouareonthetrainyoumayputyourcoatorsmallbagontheseatbesideyou.Ifyoushareaflatyoumayhaveonecornerorchairwhichisyourown. OnceIwastravellingonatraintoLondon.Iwasinasectionforfourpeopleandtherewasatablebetweenus.Themanontheoppositesidetomehadhisbriefcaseonthetable.Therewasnospaceonmysideofthetableatall.Iwasangry.Maybehethoughtthatheownedthewholetable.IhadreadabookaboutnonverbalcommunicationsoItookvariouspapersoutofmybagandputthemonhisbriefcase!WhenIdidthishestiffenedandhiseyesnearlypopped瞪出outofhishead.Ihadinvaded侵犯hisspace!AfewminuteslaterItookmypapersoffhiscaseinordertoreadthem.Heimmediatelymovedhiscasetohissideofthetable.Ofcourseitispossiblethathejustwantedtobehelpfultome! Ifyouarevisitinganothercountryyoumayfeelthatyoudon’thaveanyprivatespace.Hotelroomslookmuchthesameineverycountryintheworld.Alldaylongyousharepublicspaceswithotherpeople.Youseethelocalpeopleintheirprivatespacesandyoufeellonelyand"outside".Localpeoplecancreatetheirprivatespacesbytalkingaboutthingsyoudon’tknowabout.Andyouevenfeelthattheylikeyoutobeoutsidethemsothattheywillenjoybeinginsideevenmore!Thisisoneofthedifficultiesofbeingatraveller!Butifyouunderstanditthenithelpsyou.Haven’tyouenjoyedbeingpartofagroupand"owning"abitofspace youfeellonelyandoutsideinparagraph4meansthat.
—HiJanewouldyouliketogohikingwithmeonSunday—.Ihavetoomuchhomework．
LeiFengistheofallthepeopleinChin
millionlosegoldsinggofewrealfriendwecare Onsunnydaysyoucanenjoyyourselfonthebeaches．
Onceamanandhiswifeworkedforanoldman.Therewasabigboxintheoldman’slivingroom.Theoldmanpointedtotheboxandsaid"There’sonlyonethingyou1do.Don’topenthebox."2sayingthishelefthishome.Thewomansaidtoherhusband"Theremustbe3expensiveinthebox.Let’sopenitshallwe"Herhusbandsaid4toher.Butthewomandidn’tgiveupher5.Onedayshedecidedtofindout6wasinit.Herhusbanddidn’tstopher.Sheopenedtheboxandlookedinside.Tohersurpriseshefoundnothinginthebox.Shetriedhardtocloseitbutshe7Thateveningtheoldmancamehomeandfoundtheboxwas8.Hewasvery9andaskedthewomanandherhusbandtoleavehishome."Buttherewasnothinginthebox"thewomansaid."Wehaven’ttakenanythingatall."Theoldman10them"TheboxisnotimportantbutIcannotbelieveyou.That’simportant! 第7空应选择
—Whenshallwemeetagainnextweek—dayispossible.It'snoproblemwithme.
Onceamanandhiswifeworkedforanoldman.Therewasabigboxintheoldman’slivingroom.Theoldmanpointedtotheboxandsaid"There’sonlyonethingyou1do.Don’topenthebox."2sayingthishelefthishome.Thewomansaidtoherhusband"Theremustbe3expensiveinthebox.Let’sopenitshallwe"Herhusbandsaid4toher.Butthewomandidn’tgiveupher5.Onedayshedecidedtofindout6wasinit.Herhusbanddidn’tstopher.Sheopenedtheboxandlookedinside.Tohersurpriseshefoundnothinginthebox.Shetriedhardtocloseitbutshe7Thateveningtheoldmancamehomeandfoundtheboxwas8.Hewasvery9andaskedthewomanandherhusbandtoleavehishome."Buttherewasnothinginthebox"thewomansaid."Wehaven’ttakenanythingatall."Theoldman10them"TheboxisnotimportantbutIcannotbelieveyou.That’simportant! 第5空应选择
C OnChristmasEve—thenightbeforeChristmasDay—childrenalloverBritainputastockingattheendoftheirbedsbeforetheygotosleep.TheirparentsusuallytellthemthatFatherChristmaswillcomeduringthenight. FatherChristmasisverykind-hearted.Hegetstothetopofeachhouseandclimbsdownthechimneyintothefireplace.HefillseachofthestockingswithChristmaspresents. OfcourseFatherChristmasisn’treal.InJimandKate’shouse"FatherChristmas"isreallyMr.Green.Mr.Greendoesn’tclimbdownthechimney.Hewaitsuntilthechildrenareasleep.Thenhequietlygoesintotheirbedroomsandfillstheirstockingswithsmallpresents.WhentheywereveryyoungMr.Greensometimesworearedcoat.Buthedoesn’tdothatnow.Thechildrenarenolongeryoungandtheyknowwho"FatherChristmas"reallyis.Buttheystillputtheirstockingsattheendoftheirbeds. Whenthechildrenwereveryyoung.
Onceamanandhiswifeworkedforanoldman.Therewasabigboxintheoldman’slivingroom.Theoldmanpointedtotheboxandsaid"There’sonlyonethingyou1do.Don’topenthebox."2sayingthishelefthishome.Thewomansaidtoherhusband"Theremustbe3expensiveinthebox.Let’sopenitshallwe"Herhusbandsaid4toher.Butthewomandidn’tgiveupher5.Onedayshedecidedtofindout6wasinit.Herhusbanddidn’tstopher.Sheopenedtheboxandlookedinside.Tohersurpriseshefoundnothinginthebox.Shetriedhardtocloseitbutshe7Thateveningtheoldmancamehomeandfoundtheboxwas8.Hewasvery9andaskedthewomanandherhusbandtoleavehishome."Buttherewasnothinginthebox"thewomansaid."Wehaven’ttakenanythingatall."Theoldman10them"TheboxisnotimportantbutIcannotbelieveyou.That’simportant! 第1空应选择
—SusanIwon'tbebackfordinnerthisevening.—Don'tworryMomIcantakecareof.
Weshouldhelpherwhensheis.
Onceamanandhiswifeworkedforanoldman.Therewasabigboxintheoldman’slivingroom.Theoldmanpointedtotheboxandsaid"There’sonlyonethingyou1do.Don’topenthebox."2sayingthishelefthishome.Thewomansaidtoherhusband"Theremustbe3expensiveinthebox.Let’sopenitshallwe"Herhusbandsaid4toher.Butthewomandidn’tgiveupher5.Onedayshedecidedtofindout6wasinit.Herhusbanddidn’tstopher.Sheopenedtheboxandlookedinside.Tohersurpriseshefoundnothinginthebox.Shetriedhardtocloseitbutshe7Thateveningtheoldmancamehomeandfoundtheboxwas8.Hewasvery9andaskedthewomanandherhusbandtoleavehishome."Buttherewasnothinginthebox"thewomansaid."Wehaven’ttakenanythingatall."Theoldman10them"TheboxisnotimportantbutIcannotbelieveyou.That’simportant! 第3空应选择
Onceamanandhiswifeworkedforanoldman.Therewasabigboxintheoldman’slivingroom.Theoldmanpointedtotheboxandsaid"There’sonlyonethingyou1do.Don’topenthebox."2sayingthishelefthishome.Thewomansaidtoherhusband"Theremustbe3expensiveinthebox.Let’sopenitshallwe"Herhusbandsaid4toher.Butthewomandidn’tgiveupher5.Onedayshedecidedtofindout6wasinit.Herhusbanddidn’tstopher.Sheopenedtheboxandlookedinside.Tohersurpriseshefoundnothinginthebox.Shetriedhardtocloseitbutshe7Thateveningtheoldmancamehomeandfoundtheboxwas8.Hewasvery9andaskedthewomanandherhusbandtoleavehishome."Buttherewasnothinginthebox"thewomansaid."Wehaven’ttakenanythingatall."Theoldman10them"TheboxisnotimportantbutIcannotbelieveyou.That’simportant! 第9空应选择
Hehardlyhadanythingtoeathe
A Napogaisa12-year-oldgirlinGhana加纳Africa.Itishardforherfamilytogetcleanwater.Everymorningsheleaveshomeathalfpastfivetogetcleanwaterforherfamilyinavillagefaraway.Ittakeshersixhourstogetenoughcleanwaterfordaily日常的cookinganddrinking.Shehasnotimetogotoschoolortoplaywithherfriends.MillionsofpeopleintheworldarelikeNapoga.Theycan’tgetenoughcleanwatertokeephealthy. EarthDayisApril22.Butonallotherdayswemustalsorememberit.Thewaterweuseisthemostimportantnaturalresource自然资源ontheearth. Watercovers70%oftheearth’ssurface表面.Butmostofthatisseawater.Wecan’tuseitforverymanythings.Freshwatercoversonly1%oftheearth’ssurface. Youprobablyfeelluckythatyourlifeisn’tashardasNapoga’s.Butthatdoesn’tmeanyoudon’thavetoworryaboutwater.Weallfaceseriouswaterproblems.Oneofthemiswaterpollution.Allkindsofthingsfromcarsfactoriesfarmsandhomesmakeourriverslakesandoceansdirty.Pollutedwaterisverybadforpeopletodrink.Anddirtywaterisbadforfishtoo.Now34%ofallkindsoffisharedyingout. HowdocarsandfactoriesmakeourwaterdirtyFirsttheypollutetheair.Thenwhenitrainstherainwatercomesdownandmakesourdrinkingwaterdirty.Dirtyraincalledacidrain酸雨isalsobadforplantsanimalsandbuildings. Scientistssaythatin30yearsmorethanhalfofthepeopleintheworldwon’thaveenoughcleanwater.Wehavetolearnhowtosavemorewaterforourselvesandourchildren.Hereissomeadviceforsavingwater: Turnoffthewaterwhileyoubrushyourteeth.Youcansaveasmuchas450liters升eachmonth. Leakytaps水的龙头wastealotofwater.Fixthemrightaway! Youcaneasilycutyour1O-minuteshowers沐浴inhalf—andyou’llbejustasclean. Whenyouwashdishesdon’tletthewaterrun. Onlywashclotheswhenyouhavealottowash.Ifyourwashingmachineisn’tfullyou’rewastingwater! Acidrain.
学习的主体因素指
1868年俄罗斯心理学家乌申斯基出版了对当时的心理学发展成果进行结他因此被称为俄罗斯教育心理学的奠基人
E LastyearShanghai-bornCharlesK.KaoandtwoNorthAmericanscientistsgotthe2009NobelPrize诺贝尔奖inPhysicstogether.TheirworkmadetheInternetcomeintoanewage. Kao77wasborninShanghaiin1933.Heisfamousforfindingouthowtotransmit传输lightsignals信号overlongwaysthroughglassfibers玻璃纤维asthinasahumanhair.HisworkmakestheInternetinformationtransmitfasteraroundtheworld.Kaowasvicechancellor副校长oftheChineseUniversityofHongKongfrom1987to1996.Hedoesn’tworkandlivesinHongKongnow. TheChinesepeoplewerepleasedtolearnthegoodnews."ThepeopleofHongKongandIsendourcongratulationstoKaoonreceivingtheprize...Kaoisalsoatruegentleman.WearegreatlyproudtohavesuchanexcellentpersoninHongKong."ZengYinquanoncesaid. WillardBoyleaCanadianAmericanandGeorgeSmithoftheUnitedStatesgottheotherhalfoftheprize. TheChinesepeoplefeelatthenewsthatKaogottheNobelPrize.
按照学习迁移内容的抽象与概括化水平进行划分学习迁移可以分为
E LastyearShanghai-bornCharlesK.KaoandtwoNorthAmericanscientistsgotthe2009NobelPrize诺贝尔奖inPhysicstogether.TheirworkmadetheInternetcomeintoanewage. Kao77wasborninShanghaiin1933.Heisfamousforfindingouthowtotransmit传输lightsignals信号overlongwaysthroughglassfibers玻璃纤维asthinasahumanhair.HisworkmakestheInternetinformationtransmitfasteraroundtheworld.Kaowasvicechancellor副校长oftheChineseUniversityofHongKongfrom1987to1996.Hedoesn’tworkandlivesinHongKongnow. TheChinesepeoplewerepleasedtolearnthegoodnews."ThepeopleofHongKongandIsendourcongratulationstoKaoonreceivingtheprize...Kaoisalsoatruegentleman.WearegreatlyproudtohavesuchanexcellentpersoninHongKong."ZengYinquanoncesaid. WillardBoyleaCanadianAmericanandGeorgeSmithoftheUnitedStatesgottheotherhalfoftheprize. ZengYinquanthinksKaois.
C OnChristmasEve—thenightbeforeChristmasDay—childrenalloverBritainputastockingattheendoftheirbedsbeforetheygotosleep.TheirparentsusuallytellthemthatFatherChristmaswillcomeduringthenight. FatherChristmasisverykind-hearted.Hegetstothetopofeachhouseandclimbsdownthechimneyintothefireplace.HefillseachofthestockingswithChristmaspresents. OfcourseFatherChristmasisn’treal.InJimandKate’shouse"FatherChristmas"isreallyMr.Green.Mr.Greendoesn’tclimbdownthechimney.Hewaitsuntilthechildrenareasleep.Thenhequietlygoesintotheirbedroomsandfillstheirstockingswithsmallpresents.WhentheywereveryyoungMr.Greensometimesworearedcoat.Buthedoesn’tdothatnow.Thechildrenarenolongeryoungandtheyknowwho"FatherChristmas"reallyis.Buttheystillputtheirstockingsattheendoftheirbeds. ChristmasEveis.
标准化成绩测验
ANapogaisa12-year-oldgirlinGhana加纳Africa.Itishardforherfamilytogetcleanwater.Everymorningsheleaveshomeathalfpastfivetogetcleanwaterforherfamilyinavillagefaraway.Ittakeshersixhourstogetenoughcleanwaterfordaily日常的cookinganddrinking.Shehasnotimetogotoschoolortoplaywithherfriends.MillionsofpeopleintheworldarelikeNapoga.Theycan’tgetenoughcleanwatertokeephealthy.EarthDayisApril22.Butonallotherdayswemustalsorememberit.Thewaterweuseisthemostimportantnaturalresource自然资源ontheearth.Watercovers70%oftheearth’ssurface表面.Butmostofthatisseawater.Wecan’tuseitforverymanythings.Freshwatercoversonly1%oftheearth’ssurface.Youprobablyfeelluckythatyourlifeisn’tashardasNapoga’s.Butthatdoesn’tmeanyoudon’thavetoworryaboutwater.Weallfaceseriouswaterproblems.Oneofthemiswaterpollution.Allkindsofthingsfromcarsfactoriesfarmsandhomesmakeourriverslakesandoceansdirty.Pollutedwaterisverybadforpeopletodrink.Anddirtywaterisbadforfishtoo.Now34%ofallkindsoffisharedyingout.HowdocarsandfactoriesmakeourwaterdirtyFirsttheypollutetheair.Thenwhenitrainstherainwatercomesdownandmakesourdrinkingwaterdirty.Dirtyraincalledacidrain酸雨isalsobadforplantsanimalsandbuildings.Scientistssaythatin30yearsmorethanhalfofthepeopleintheworldwon’thaveenoughcleanwater.Wehavetolearnhowtosavemorewaterforourselvesandourchildren.Hereissomeadviceforsavingwater:Turnoffthewaterwhileyoubrushyourteeth.Youcansaveasmuchas450liters升eachmonth.Leakytaps水的龙头wastealotofwater.Fixthemrightaway!Youcaneasilycutyour1O-minuteshowers沐浴inhalf—andyou’llbejustasclean.Whenyouwashdishesdon’tletthewaterrun.Onlywashclotheswhenyouhavealottowash.Ifyourwashingmachineisn’tfullyou’rewastingwater!What’sthemainideaofthepassage
E LastyearShanghai-bornCharlesK.KaoandtwoNorthAmericanscientistsgotthe2009NobelPrize诺贝尔奖inPhysicstogether.TheirworkmadetheInternetcomeintoanewage. Kao77wasborninShanghaiin1933.Heisfamousforfindingouthowtotransmit传输lightsignals信号overlongwaysthroughglassfibers玻璃纤维asthinasahumanhair.HisworkmakestheInternetinformationtransmitfasteraroundtheworld.Kaowasvicechancellor副校长oftheChineseUniversityofHongKongfrom1987to1996.Hedoesn’tworkandlivesinHongKongnow. TheChinesepeoplewerepleasedtolearnthegoodnews."ThepeopleofHongKongandIsendourcongratulationstoKaoonreceivingtheprize...Kaoisalsoatruegentleman.WearegreatlyproudtohavesuchanexcellentpersoninHongKong."ZengYinquanoncesaid. WillardBoyleaCanadianAmericanandGeorgeSmithoftheUnitedStatesgottheotherhalfoftheprize. CharlesK.Kaowasbornin.
BWastecanbeseeneverywhereintheschool.Somestudentsaskformorefoodthantheycaneatandothersoftenforgettoturnoffthelightswhentheyleavetheclassroom.Theysaytheycanaffordthesethings.ButIdon’tagreewiththem.Wastecanbringalotofproblems.AlthoughChinaisrichinsomeresources资源weareshortof缺乏othersforexamplefreshwater淡水.Itisreportedthatwewillhavenocoal煤oroiltousein100years.SoifwegoonwastingourresourceswhatcanweuseinthefutureandwherecanwemoveThinkaboutit.Ithinkweshouldsaynotothestudentswhowastethingseveryday.Everybodyshouldstopwastingassoonaspossible.Inoureverydaylifewecandomanythingstopreventwastefromhappeningforexampleturnoffthewatertaps水龙头whenwefinishwashingturnoffthelightswhenweleavetheclassroomtrynottoordermorefoodthanweneedandsoon.Littlebylittleeverythingwillhechanged.Wastecanbestoppedonedayifwedoourbest.Whichofthefollowingisright
C OnChristmasEve—thenightbeforeChristmasDay—childrenalloverBritainputastockingattheendoftheirbedsbeforetheygotosleep.TheirparentsusuallytellthemthatFatherChristmaswillcomeduringthenight. FatherChristmasisverykind-hearted.Hegetstothetopofeachhouseandclimbsdownthechimneyintothefireplace.HefillseachofthestockingswithChristmaspresents. OfcourseFatherChristmasisn’treal.InJimandKate’shouse"FatherChristmas"isreallyMr.Green.Mr.Greendoesn’tclimbdownthechimney.Hewaitsuntilthechildrenareasleep.Thenhequietlygoesintotheirbedroomsandfillstheirstockingswithsmallpresents.WhentheywereveryyoungMr.Greensometimesworearedcoat.Buthedoesn’tdothatnow.Thechildrenarenolongeryoungandtheyknowwho"FatherChristmas"reallyis.Buttheystillputtheirstockingsattheendoftheirbeds. FatherChristmascomesintothehousethroughthe.
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（x－2)2＝4，解方程，得x－2＝2，x＝4 4(x－1)2＝9，解方程，得4(x－1)＝±3，x1＝
，x2＝
(2x＋3)2＝25，解方程，得2x＋3＝±5，x1＝1，x2＝－4
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