Unit3Ahelpinghand（Discovery）课件沪教版（五四学制）英语七年级下册

第六课时Unit3DiscoveryAhelpinghand初中英语沪教版（五四学制）七年级下册Learningobjectives通过本课时学习，学生能够：1.获取有关求助信号SOS以及聋哑人如何用手语向别人寻求帮助的

信息；2.运用阅读技巧获取关键信息，能够准确回答与文本相关的问题；3.思考并尝试发现其他可能的求救信号及其应用场景；4.增强安全意识，认识到求救信号在紧急情况下的重要性。

重点

重点WatchandanswerWhatisthewomantalkingabout?SheisexplainingSOS.Lookandanswer1.Doyouknowwhat’sinthepicture?

MorseCode(摩尔斯电码)Morsecodeisawaytosendmessagesusingshortandlongsignals.Thesesignalsarecalleddots(.)anddashes(-).Eachletterofthealphabetandeachnumberhasitsowncombinationofdotsanddashes.2.CanyouwritetheMorsecodeforSOSbasedonthepicture?S

O

S···---···dashesdotsLookandwriteLookandwrite3.CanyouwritetheMorsecodeforHELPbasedonthepicture?HELP······-···--·Lookandfind4.Canyoufindthelettersrepresentedby“191519”inthepicture?191519S

O

SLookandwrite5.Canyouwritedownwhatthesenumbersrepresent?03080914010912152205251521ChinaIloveyouSOSThebest-knownsignalforhelpmaybe“SOS”.It’saninternationalsignalthatcanbeusedinanyemergency.ItcomesfromtheMorsecode,whichusesdotsanddashes,soit’snottheshortformofanyEnglishwords.However,itdoeshavealess-knownform—“191519”,whicharethepositionsof“S”,“O”,“S”inthe26Englishletters.SkimandanswerSignalsforhelpSkimthetextandanswerthequestion.Signlanguagesforthedeaf-muteSignlanguagesallowthedeaf-mutetoaskforhelp,buttheyvaryfromcountrytocountry.InChina,showingyourpalmsoutandflappingtwicemeans“help”,butinAmerica,youhavetoputathumbuponyourotherpalmtodeliverthesamemessage.Whattwosignalsforhelpcanyoufindinthetext?ReadandanswerReadSOSandanswerthequestions.1.WheredoestheSOSsignalcomefrom?

2.WhatdoesMorsecodeuse?2.IsSOStheshortformofsomeEnglishwords?

3.Whatdoes“191519”representinthetext?

HowcanwesendMorsecodeinourdailylife?ItcomesfromtheMorsecode.No,it’snottheshortformofanyEnglishwords.Thepositionsof“S”,“O”,“S”inthe26Englishletters.Itusesdotsanddashes.ThinkandshareHowcanwesendMorsecodeinourdailylife?Dot(.)isrepresentedbyashortsoundortap(e.g.,abrieftap).Dash(-)isrepresentedbyalongsoundortap(e.g.,alongertap).1.

UsingSoundForexample,theletterA(.-)is:Dot(.)=shorttap.Dash(-)=longertap.2.

UsingLightSignalsDot(.)

isaquickflashoflight.Dash(-)

isalongerflashoflight.Forexample,theletterS(…)wouldbethreequickflashesoflight.3.UsingGesturesDot(.):Ashorthandmovement.Dash(-):Alongerhandmovement.4.UsingTextYoucanalsosendMorsecodebytypingitoutonpaperorthroughelectronicdevices.SimplylookuptheMorsecodeforeachletterornumberandwriteitdown.ReadandmatchChinaAmericaReadsignlanguagesforthedeaf-mute

andmatchthepicturewiththecountry.HELPReadandanswerReadagainandanswersomequestions.1.Whatallowthedeaf-mutetoaskforhelp?

2.Aresignlanguagesthesameallovertheworld?2.Howcanyouusesignlanguagetoshow“help”inChina?

3.Howcanyouusesignlanguagetoshow“help”inAmerica?

CanyouuseChinesesignlanguageandAmericansignlanguagerespectivelytoexpress“help”?Signlanguages.Showyourpalmsoutandflaptwice.Putathumbuponyourotherpalm.No,theyvaryfromcountrytocountry.Discussandshare1.WhymightChinaandtheUSusedifferentsignlanguages?2.Whatproblemscouldhappenifyouusethewronggestureabroad?SOSThebest-knownsignalforhelpmaybe“SOS”.It’saninternationalsignalthatcanbeusedinanyemergency.ItcomesfromtheMorsecode,whichusesdotsanddashes,soit’snottheshortformofanyEnglishwords.However,itdoeshavealess-knownform—“191519”,whicharethepositionsof“S”,“O”,“S”inthe26Englishletters.Let’sreadSignalsforhelpLet’sreadthetextloudlytogether.Signlanguagesforthedeaf-muteSignlanguagesallowthedeaf-mutetoaskforhelp,buttheyvaryfromcountrytocountry.InChina,showingyourpalmsoutandflappingtwicemeans“help”,butinAmerica,youhavetoputathumbuponyourotherpalmtodeliverthesamemessage.DiscussandshareDoyouknowanyothersignalsforhelp?BodysignalsForexample,raiseyourarmsaboveyourhead,andkeepswingingandwaving,especiallywhenyouseearescueplanepassingby.Smokeorfire:Coveringthefirewithsomegreenbrancheswithwaterwillproducewhitesmoke,whichcanbeseenseveralkilometresaway.Ifrubberisaddedtothefire,blacksmokewillbeproduced.ShoutingorcallingforhelpCallingout“Help!”inaloud,clearvoiceisoneofthemostbasicanddirectformsofsignalingforhelp.ThreeshortwhistleblastsBlowawhistleormakealoudsound(e.g.,usingahorn)inthreeshortbursts,followedbyapause,andrepeat.DiscussandshareDoyouknowanyothersignalsforhelp?Usinga“help”flagAflag(oranybrightlycoloredcloth,shirt,orobject)canbeusedasasignalforhelp.Thepersonwavesitintheairtoattractattention.MirrorsignalAsmallmirrororanyreflectivesurfacecanbeusedtoreflectsunlight,creatingavisibleflashthatcanbeseenfromadistance.NightsignalAglowstickorflashlightcanbeusedtocreatevisiblelightthatattractsattention.Atnight,aflashlightcanbeflashedinSOSpatterns.GroundsignalYoucancreatelargegroundsignalsthatcanbeseenfromtheair,suchasspellingoutSOSwithrocks,logs,oranyothermaterials.RoleplayWorkingroupstochooseoneoftheemergencysituations,useyourkn