全优课堂 英语 高考总复习 课件UNIT 4　JOURNEY ACROSS A VAST LAND

选择性必修

第二册UNIT4

JOURNEYACROSSAVASTLAND(本栏目对应学生用书P204)目录1每日早晚必背2课前语基夯实3考点多维突破4能力优化集训5课时作业★每日早晚必背假定你是李华，你的澳大利亚笔友James将和家人来中国旅游，想让你为他推荐一条旅游路线。请你给James回一封邮件。内容包括：

1.行程线路（包含2~3个城市）；2.景点介绍；3.交通方式。注意：1.词数80左右；2.可适当增加细节，以使行文连贯。【佳文背诵】DearJames，

Iam

delighted

to

hearthatyouandyourfamilyarecomingtoChinaforavisit.Based

oncarefulconsideration，IwanttorecommendarouteforyourvisittoChina. SinceyouwillarriveinBeijingfirst，youcanvisitthePalaceMuseumandtheGreatWall，bothofwhichare

famous

fortheirlonghistoryandgrandscenery.Thenyoucantakethehigh-speedtraintoXi’an，whereyoucanvisittheamazingTerracottaWarriorsandenjoyawidevarietyofdeliciouslocalfoodthere.Forthe

last

leg

ofyourtrip，IsuggestyouflytoGuilininGuangxiProvince.I’msurethenaturalbeautytherewillleave

a

deep

impression

on

you.

Allthebestwishes！Yours，LiHua【词汇积累】bedelightedtodo…很高兴做……basedon基于；根据recommendv.推荐befamousfor…因……而出名thelastlegof………的最后阶段leaveadeepimpressiononsb给某人留下深刻的印象【句式仿写】1.这个省有七大自然奇观，其中有三个离你不远。（“介词+which”引导非限制性定语从句）Therearesevennaturalwondersinthisprovince，

notfarfromwhereyouare.

2.我建议你尽快做决定并订好票。（suggest+宾语从句）

adecisionandbooktheticketsassoonaspossible.

threeofwhichareIsuggestyou（should）make▶高频重点词汇◎核心词汇

会运用1.

adj.准备前往（某地）；一定会

2.

adj.令人惊叹的；可怕的；很好的

3.

n.烤面包片；吐司；干杯

vt.为……干杯vt.&

vi.烤（尤指面包）4.

n.口音

5.

n.窗帘

★课前语基夯实boundawesometoastaccentcurtain6.

vi.行进；继续做

7.

adv.（结束交谈或转换话题时）不过；反正

8.

n.国界；边界（地区）

9.

n.最好或最精彩的部分

vt.突出；强调；使醒目10.

vi.起身；出现；由……引起

11.

n.束；串；捆

12.

adj.相反的；相对立的n.相反的事实（或事情）

proceedanyhowborderhighlightarisebunchcontrary【语境活用】根据汉语提示完成句子1.

（精彩之处）includeChina’smostsacredpeaksatMountTaiandHangzhou’srollinghills，waterwaysandpeacefultemples.

2.Astopresents，IproposethatyoushouldchoosesomewithNewZealandfeatures，whichis

（一定会）towinyourfriend’saffection.

Highlightsbound3.Anumberofhighbuildingshave

（出现）wheretherewasnothingbutruinsayearago.

4.ThereisanannouncementthatpassengersforRomeshould___________

（行进）toGate32forboarding.

5.PeoplefromdifferentpartsoftheUKspeakdifferently，sotherearelotsofdifferent

（口音）.

arisenproceedaccents◎拓展词汇

能提升1.

adj.令人愉快的；友好的→

n.高兴；快乐→

adj.高兴的；满意的

2.

n.大量；块；团→

adj.巨大的；非常严重的

3.

adj.逐字的→

adv.

字面上；真正地→

n.文学

4.

n.呼吸的空气→

v.呼吸→

adj.气喘吁吁的

pleasantpleasurepleasedmassmassiveliteralliterallyliteraturebreathbreathebreathless5.

vi.

&

vt.结冰；（使）冻住→

adj.极冷的；冰冻的→

adj.冷冻的；冻僵的

6.

vt.预料；预见；期望→

adj.受期待的→

n.预期；预料

7.

n.霜；严寒天气；霜冻vt.使蒙上霜vi.结霜→

adj.结霜的；天气严寒的；冷淡的

8.

n.最好或最精彩的部分vt.突出；强调；使醒目→

adj.突出的

freezefreezingfrozenanticipateanticipatedanticipationfrostfrostyhighlighthighlighted9.

n.岸；滨→

adv.在岸上

adj.在岸上的；在陆上的→

n.海（湖）岸线

10.

vt.使十分惊讶；使吃惊→

adj.令人吃惊的→

感到十分惊讶的→

n.吃惊；惊讶

11.

n.薄雾；水汽→

adj.多雾的；模糊的

12.

n.（informalad）广告；启事→

v.宣传；为……做广告→

n.登广告者；广告商

shoreashoreshorelineastonishastonishingastonishedastonishmentmistmistyadvertisementadvertiseadvertiser13.

n.钢；钢铁工业→

adj.钢铁般的；顽强的；冷酷的

14.

n.相片v.（给……）拍照→

n.摄影师；拍照者→

n.摄影

15.

vi.打雷；轰隆隆地响；轰隆隆地快速移动n.雷声；轰隆声→

adj.雷鸣般的；怒气冲冲的

16.

vt.欠（账、债、情等）→

adj.拖欠；未付；未偿还

steelsteelyphotographphotographerphotographythunderthunderousoweowing【语境活用】使用所给单词的适当形式填空1.Itis

outsidenow，andmoresnowisfallingonalready

streets.（freeze）

2.Tomy

，hedidn’tfeel

atthe

newsthattwofileshadgonemissing.（astonish）

3.Facingthetask，hetookseveral

tocalmhimselfdown.Afterfinishingit，he

asighofrelief.（breathe）

freezingfrozenastonishmentastonishedastonishingbreathsbreathed4.WhenIchosetomakethisvideo，Iwantedtocapturethefeelingofwonderand

andshowtheaudiencehowvastand

theuniverseis.（awe）

5.Whenpracticingforinterviews，he

somequestionsandgotready.Thenhewaited，nervousbutfullof

.（anticipate）

6.Therareanimalsaredisappearingonsucha

scalethatpeopleareshockedatthe

extinction.（mass）

aweawesomeanticipatedanticipationmassivemass▶高频短语串记※单元短语再现【语境活用】选用所给短语的适当形式填空1.

wateringrowsofsoil，thesystemprovidesjusttherightamounttoeachplant.

2.Ibelievethathisspeech

inspirelotsofteenagers.

takesb.’sbreathaway；freezingcold；proceedto；abunchof；owe…to…；contraryto；ratherthan；beboundtoRatherthanisboundto3.Theirsuccess

more

goodluckthantocarefulmanagement.

4.

popularbelief，manycatsdislikemilk.

5.Itwas

outside，soIdidn’twanttogetoutofthecar.

6.Visitorsleavingforthemuseumshould

thenextentrance.

7.Youmightliketoadd

freshherbstothestock.

8.WewenttoHainanwheretheblueseaandtheclearsky

.

owestoContrarytofreezingcoldproceedtoabunchoftookourbreathaway▶重点句型仿写1.含有not

until的强调句型Itwasnotuntil9：30a.m.thattheyfinallyreachedthecapitalofOntario，Toronto.

直到上午9点30分，他们才终于到达安大略省的首府多伦多。［仿写］

（直到半夜）hegothomeyesterday.

Itwasnotuntilmidnightthat2.as

soon

as引导时间状语从句Wewenttobedassoonaswearrivedatthehotelbecauseweweresotired.

［仿写］

（蛋糕一烤好），removeitfromtheoven.

Assoonasthecakeisdone3.省略if的虚拟句的倒装Shouldtheopportunityarise，I’dlovetogotoCanada.

如果将来有机会，我很想去加拿大。［仿写］

（如果下雨）tomorrow，wewouldnotgoclimbing.

Shoulditrain▶词汇精磨1.arise

vi.起身；出现；由……引起（arose；

arisen）【探究归纳】★考点多维突破【典例示范】Severalnewindustriesaroseinthetown.城里出现了好几种新行业。Thecivilwararose

fromthesocialinjusticespresentinthecountry.内战是由该国内部现存的社会不公所引起的。【拓展提升】词汇过去式/分词词义与用法示例arisearose；arisen不及物动词，意为“起身；出现；由……引起”Anewproblemhasarisen.一个新的问题出现了。riserose；risen不及物动词，意为“上升；升起；增长”Thesunrisesintheeast.太阳从东方升起。raiseraised；raised及物动词，意为“筹集；举起；提高；饲养，抚养”Heraisedhishandtoanswerthequestion.他举手回答问题。【即学即练】猜测黑体词的含义/完成句子（1）Seeinghismotherreturnhome，theboyarosefromhischairimmediately.

（2）Iamconfidentthatnewopportunitieswillariseandthatyouwillultimatelyachieveyourambition.

（3）Theyaroseatsunrisetogettotheparkearly.

起身出现起床（4）身体不适会引起情绪问题，所以保持身体健康很重要。Mentalproblemscan

aphysicalcause，soitisveryimportanttostayphysicallyhealthy.

arisefrom/outof2.bound

adj.准备前往（某地）；一定会【探究归纳】【典例示范】Ifyoufollowmysuggestions，Ibelieveyouare

bound

to

haveagreattime.如果你听从我的建议，我相信你一定会玩得很开心。【即学即练】单句语法填空/完成句子（1）You’vedonesomuchwork—you’rebound

（pass）theexam.

（2）Wearebound

Beijingtoattendhisanniversaryofmarriagenextweek.

（3）他工作太忙，没有很多时间陪孩子。He

hisworktohavemuchtimeforhischildren.

topassforistooboundupin3.freeze

vi.&

vt.结冰；（使）冻住【探究归纳】【典例示范】Ifwedon’tdosomethingsoon，we’llallfreeze

to

death.如果再不采取措施，我们都会被冻死的。Andifsomethinglikethat’severhappenedtoyou，youmightevenfreeze

upandfeelreallyawkward.如果这种事情发生在你身上的话，你可能会不知所措并感到非常尴尬。【即学即练】单句语法填空/完成句子（1）Thetemperatureremainedbelow

（freeze）pointthroughouttheday.

（2）Thesnowhadmelted，butthelakewasstill

（freeze）solid.

（3）天气变得如此寒冷，他担心自己会冻死。Theweatherturnedsocoldthathewasafraidthathemight

.

freezingfrozenfreezetodeath（4）每次你需要和面试官用英语交流的时候就愣在了那里。EverytimeyouneedtocommunicatewiththeinterviewerinEnglish，you

.

freezeup4.astonish

vt.使十分惊讶；使吃惊【探究归纳】【典例示范】Hewasastonishedtoseehowhishometownhadchangedinthepast10years.他惊讶地看到他的家乡在过去的十年里发生了多么大的变化。【即学即练】单句语法填空/同义句转换（1）Whenhelookedatthemenu，an

（astonish）lookquicklyappearedonhisface.

astonished

（2）Giventhe

（astonish）potentialofAItotransformourlives，weallneedtotakeactiontodealwithourAI-poweredfuture.

（3）Tomyastonishment，shedidn’tcareaboutmyfeelings.→Shedidn’tcareaboutmyfeelings，

.（定语从句）

→

shedidn’tcareaboutmyfeelings.（it作形式主语）

→

shedidn’tcareaboutmyfeelings.（主语从句）

astonishingwhichastonishedmeItwasastonishingthatWhatastonishedmewas5.owe

vt.欠（账、债、情等）【探究归纳】【典例示范】Shestillowesherfather￡3，000./Shestillowes

￡3，000toherfather.她还欠她父亲3000英镑。【即学即练】单句语法填空/完成句子（1）IknewthatIowedmylife

thedoctorsandnurses.

to（2）

（owe）tohisillness，Petercouldn’tkeepupwiththerestoftheclass.

（3）他去年夏天买东西欠的钱还没还。Hestill

whatheboughtlastsummer.

（4）我觉得你应该给自己放一天假。Ithinkyou

adayoffwork.

Owingowesforoweittoyourselftohave6.take

sb.’s

breath

away

令人惊叹【探究归纳】【典例示范】Shewassoonout

of

breath，butshedidn’tgiveup.她很快就上气不接下气，但她没有放弃。Johnheld

his

breathandwonderedwhatwouldhappennext.约翰屏住呼吸，想知道接下来会发生什么事。【即学即练】单句语法填空/完成句子（1）Asweroundedacurve，awaterfalltookourbreath

.

away（2）Hetookadeep

（breathe）beforehewentunder.

（3）Iheldthedryfloweruptomynoseand

（breathe）inthesmellofabeautifulrose.

（4）当我们气喘吁吁地到达车站时，火车已经离开一个小时了。Whenwegottothetrainstation

，thetrainhadleftforhalfanhour.

breathbreathedoutofbreath▶句型透视1.（教材P41）Wewenttobedas

soon

as

we

arrived

at

the

hotelbecauseweweresotired.

我们一到旅馆就上床睡觉了，因为我们太累了。【句式提炼】该句是由“assoonas”引导的时间状语从句。【归纳拓展】语法现象assoonas表示“一……就……”结构特点assoonas引导的状语从句的时态通常与主句保持一致，但有时也遵循“主将从现”原则同义表达instantly/immediately，theminute/moment/instant，on/upon+v.-ing等【典例示范】On/Upon

arrivinginBeijing，hecalledmeup.他一到北京就给我打了电话。Meowingstartsas

soon

asababycatisbroughttolifeandusesittogetthemother’sattentionandbefed.猫宝宝一出生就开始喵喵叫，喵喵叫是为了引起妈妈的注意，让妈妈给它喂食。【即学即练】同义句转换Hegotdowntobusinessassoonashesatatthedesk.→Hegotdowntobusiness

hesatatthedesk.（用副词引导从句）

→Hegotdowntobusiness

hesatatthedesk.（含有the的短语）

immediately/instantlythemoment/minute/instant2.（教材P39）It

was

not

until

9：30

a.m.thattheyfinallyreachedthecapitalofOntario，Toronto.

直到上午9点30分，他们才终于到达安大略省的首府多伦多。【句式提炼】本句是一个含有“notuntil”的强调句型。【归纳拓展】句型Itis/wasnotuntil…that/who…特点由于not已经前移，that后面的句子应改为肯定句常考点填写that/who或it注意和not…until…的倒装句要分清【典例示范】It

was

not

untilAlicehadababyofherownthatshebecameawarehowharditwasforhermothertohavebroughtuphersisterandheronherown.直到爱丽丝有了自己的孩子，她才意识到她的母亲养育她的妹妹和自己是多么的艰难。【即学即练】单句语法填空/同义句转换（1）Itwasthedaybeforeyesterday

Ilearnedaboutthenews.

（2）Notuntilshecalledthemanager’ssecretarythreetimes

（be）shetoldthatthemanagerwenttoanimportantmeeting.

（3）Themanwasnotabletospeakuntilatleastthirtysecondshadpassed.→

atleastthirtysecondshadpassed

themanwasabletospeak.

thatwasItwasnotuntilthatⅠ.语境辨义根据语境写出黑体词的词性及含义1.Butwiththisopeningofwhathadbeenamostlyclosedsystem，possibilitiesemerge，

literallywithoutlimit.

2.Therehadbeenamassivesearchunderway.

3.Hotelroomsaredifficulttofindatthepeakoftheholidayseason.

★能力优化集训adv.真正地adj.大量的；大规模的n.顶峰4.Nothingelsebigwashappeningintheworldandnewspaperslovetohighlightproblemsthatthetelevisionnetworksface.

5.Theseworkshops，usuallyofoneortwodays’

duration，bringteachersandindustrialmanagerstogether.

6.Unlessyourecogniseanidiomwhenitisbeingused，itiseasytomisunderstandwhatyoureadorhear.

7.TherearealsosomeinterestingoldbuildingstoseearoundtheShoreandattheold-worldfishingharbourofNewHaven._________________vt.强调n.持续时间n.习语；成语n.（海）港Ⅱ.单句语法填空1.Ifirmlybelievethatyouarebound

（lead）anideallifewithyourconsistentefforts.

2.Playerswhoproceed

thefinalsofthecompetitionareallfromChina.

3.Heconsumedsomuchfoodatatime，whichgreatly

（astonish）me.

4.Inthepastfewyears，differentcategoriesofcellphones______________

（arise）.

toleadtoastonishedhavearisen5.It’shightimethatI

（toast）thesuccessofyourassociation.

6.Totellthetruth，thespectacularsceneryliterallytookmy____________

（breathe）away.

7.The

atmosphereintheroomgreatly

me，whichbroughtmemuch

.（please）

8.The

has

manyfamousfilmstars.（photograph）

toasted/shouldtoastbreathpleasant/pleasingpleasedpleasurephotographerphotographed9.Imustputan

inanewspaperto

mynewshop.（advertise）

10.Ona

day，wecouldonlyseetheoutlineofthehousethroughthe

.（mist）

advertisementadvertisemistymistⅢ.选词填空用本单元所学词汇完成下列短文，并背诵该短文。（黑体词汇为本单元词汇）takesb.’sbreathaway；proceedto…；owe…to…；contraryto；freezingcold；beastonishedtoAphotographerwasenrolledinawintercampandona1.

.day，heboardedthetrainboundforaharbourcity.Theanticipatedarrivaltimewassixintheevening.Drawingbackthecurtain，he2..

__________seemistycloudsfloatingonthepeaksofamassivemountains.3.

hisinitialbelief，whatheconsideredboringonthetrainprovedtobeoneofthehighlightsoftheawesometrip.Withthetrainthunderingon，hereachedthedestinationatdusk.Spectacular

sceneryandpleasantfreshairliterally

4.

.Tallbuildingsofglassandsteel

aroseeverywhere.HewasattractedbytheexceptionalfreezingcoldwasastonishedtoContrarytotookhisbreathawayadvertisementsintheshoppingmall，sellingcrafts，antiquesandbunchesofflowers.Feelingalittlehungry，heboughtapieceoftoastinthesupermarketalongsidethestreet，wherehechattedwithpeoplewithdifferentaccents.Anyhow，he5.

hishappiness

thewintercamp.Thenextevening，hewould6.

thenextstop.

owedtoproceedtoⅣ.微写作根据汉语提示并运用本单元的词汇和语法写一段话去年夏天，我和朋友做出了我们一定要一起旅游的决定。因为这是我们第一次出国旅行，所以我们在网上浏览了大量的信息。我们被一则环游北美的广告吸引了。最后，我们决定前往加拿大，那里的壮观风光让我们叹为观止。当然，在这一周的时间里，我们体验了当地的文化和传统。然而，最让我们惊奇的是美食，比如咖啡、烤面包片和奶酪。【答案】Onepossibleversion：Lastsummer，myfriendandImadeadecisionthatwewereboundtotraveltogether.Becauseitwasourfirsttimetotravelabroad，welookedthroughmassiveinformationonline.WewereattractedbyanadvertisementoftravellingaroundNorthAmerica.Atlast，wedeterminedtoproceedtoCanadawhosespectacularscenerytookourbreathaway.Ofcourse，intheoneweek’sduration，weexperienceditscultureandtraditions.However，whatastonishedusmostwasthedeliciousfood，suchascoffee，

toast，andcheese.（本栏目对应课时作业P523）Ⅰ.阅读理解ACyclingincitieswithproperbikinginfrastructure（基础设施）cangivepeopleacloserexperienceoftravellingaroundaplacethatcarsandbusessimplycan’t.Herearefourcycle-friendlycitiesaroundtheworld.Utrecht，

NetherlandsWhiletheNetherlands’mostpopulouscity，Amsterdam，isdefinitelybikefriendly，we’reheadingsoutheasttoUtrecht，acitythathasafairclaimtobeingtheglobe’smostpro-two-wheeldestination.Initscentre，upto50%ofalljourneystakeplacebybikeandlocalauthoritiesarebuildinga12，500-spacecycleparkingfacilityadvertisedastheworld’sbiggest.Copenhagen，

Denmark

MorethanhalfthelocalsintheDanishcapitalcycletoworkorschool，andwithanestimatedbikepopulationof650，000thereareslightlymorecyclesthanpeople.Cityleadersdeterminenotjustonincreasingbikeusefurther，butpromotingsafebikeinfrastructurethatfeaturesbikelanes（车道）ofuptothreemetresinwidth.

Berlin，

Germany

Germanyhasbeenquietlygettingonwithboostingbikeuseinmanyofitscities.Berlinisthestandoutexample.About13%ofalltripsinthecityaremadebybike，nearlytwicetherateof20yearsago.Tokyo，

Japan

Inthisvastcapitalcity，anamazing14%ofalltripsaremadebybike.TherearepracticalreasonswhymanyTokyoresidentspreferabiketoacarforshorterjourneys.Beforeyoucanevenbuyacarinthecity，youmustproveyoupossessanoff-streetparkingspot（thatisusuallyexpensive）.However，fewpeoplecycletowork—distancestendtobelong，andpublictransportishugelyefficient.Also，alotofcyclingtakesplace—legally—onfootpathsandsidewalks.1.WhatisspecialaboutUtrecht？A.IthasamuchlargerpopulationthanAmsterdam.B.Itistheonlycycle-friendlycityinNetherlands.C.Cyclingaccountsforabouthalfoftripsdowntown.D.Ithastheworld’slargestnon-cyclingpopulation.√1.细节理解题。根据Utrecht，Netherlands部分中的“Initscentre，upto50%ofalljourneystakeplacebybike”可知，乌得勒支省的特殊之处在于骑自行车约占市中心出行的一半。故选C项。2.Whichcitytakessecurityintoconsiderationwhenbuildingbikeinfrastructure？A.Utrecht. B.Copenhagen.C.Berlin. D.Tokyo.√2.细节理解题。根据Copenhagen，Denmark部分中的“…promotingsafebikeinfrastructurethatfeaturesbikelanes（车道）ofuptothreemetresinwidth.”可知，哥本哈根在修建自行车基础设施时会考虑安全因素。故选B项。3.WhydosomecitizensinTokyohaveapreferenceforabicycle？A.Theyprefertotravellongdistancesbybike.B.Theyarenotallowedtocycleonsidewalks.C.Theyhavenoeasyaccesstobusesortrains.D.Theyprobablycan’taffordaparkingplace.√3.推理判断题。根据Tokyo，Japan部分中的“Beforeyoucanevenbuyacarinthecity，youmustproveyoupossessanoff-streetparkingspot（thatisusuallyexpensive）.”可知，一些东京市民偏爱自行车可能是因为他们买不起停车位。故选D项。【答案】【语篇解读】本文是一篇应用文。文章介绍了全球四个适合骑行的城市。BAtinyAlaskavillagehasexperiencedaboomintourisminrecentyearsaspolarbearsspendmoretimeonlandthanonArcticseaice.Morethan2，000peoplevisitedthenorthernAlaskavillageofKaktovikin2018toseepolarbearsinthewild.Thefarnorthcommunityliesinanareawhereincreasinglyhighertemperaturehasspedupthemovementofseaice，theprimaryhabitatofpolarbears.Asicehasgraduallymovedtodeepwaterbeyondthecontinentalshelf，morebearsareremainingonlandtolookforfood. PolarbearshavealwaysbeenacommonsightonseaicenearKaktovik，butvillagersstartednoticingachangeinthemid-1990s.Morebearsseemedtostayonland，andresearchersbegantakingnoteofmorefemalebearsmakinghomesinthesnowonlandinsteadofontheicetoraisetheirbabies.USAFishandWildlifeServicebiologistsbeganhearingreportsoftheincreasingnumberofpolarbearsintheareaintheearly2000s.Asmoreattentionwasgiventotheplight（困境）ofpolarbearsaboutadecadeago，moretouristsstartedheadingtoKaktovik. Thevillagehadfewerthan50visitorsannuallybefore2011，saidJenniferReed，aworkeroftheArcticNationalWildlifeRefuge.“Todaywe’retalkingabouthundredsandhundredsofvisitors，manyfromaroundtheworldeachyear，”Reedsaid.Mosttouristsvisitinthefall，whenbearsareforcedtowardlandbecauseseaiceisfarthestawayfromtheshore.BruceInglangasak，alocalhunterwhosometimesofferswildlife-viewingtours，saidhe’sbeenofferingpolarbeartourssince2004.MostofhisclientsarefromChinaandEurope，aswellasfromthelower48USAstates.Manytouristsstayseveraldaysinthevillage，whichhastwosmallhotels.Thevillagershavebenefitedalotfromthat.Inturn，theyprovidemoreeffectiveprotectionforpolarbearswithfinancialsupportfromtourismdevelopment.4.WhatcausesmorepolarbearstostayonlandinKaktovik？A.Foodshortage.B.Climatechange.C.Habitats’movementtoshore.D.Theirpreferenceforland.√4.细节理解题。根据第二段中的“…increasinglyhighertemperaturehasspedupthemovementofseaice，theprimaryhabitatofpolarbears.Asicehasgraduallymovedtodeepwaterbeyondthecontinentalshelf，morebearsareremainingonlandtolookforfood.”可知，全球变暖加速了海冰融化，破坏了北极熊原本的栖息地，所以越来越多的北极熊待在陆地上以寻找食物。故选B项。5.Howdidcommonpeoplefeelaboutmoresightofbearsonland？A.Excited. B.Puzzled.C.Concerned. D.Shocked.√5.推理判断题。根据第三段中的“Morebearsseemedtostayonland，andresearchersbegan…toraisetheirbabies.”和“Asmoreattentionwasgiventotheplight（困境）ofpolarbearsaboutadecadeago，moretouristsstartedheadingtoKaktovik.”可知，随着越来越多的北极熊出现在陆地上，研究人员、生物学家等也越来越多地关注北极熊所处的这一困境，随后，更多游客前往Kaktovik。由此可推知，大众对更多北极熊登上陆地的现象表示关注。故选C项。6.Whatcanbeinferredfromthelastparagraph？A.HotelsinKaktovikareindemandinautumn.B.Kaktovikhasabout50visitorsannually.C.Inglangasakmakesalivingasatourguide.D.Tourismaffectsthebalanceofnature.√6.推理判断题。根据最后一段中的“Mosttouristsvisitinthefall”和“Manytouristsstayseveraldaysinthevillage，whichhastwosmallhotels.”可知，大多数游客会选择在秋季参观Kaktovik，而且很多游客会在这个小村庄待上几天，而这个小村庄只有两个小旅馆。由此推知，在秋季，Kaktovik的旅馆的需求量很大。故选A项。7.Whichsayingcandescribethetext？A.Thefittestcansurvive.B.Afterastormcomesacalm.C.Thereisalwaysopportunityincrisis.D.Everycoinhastwosides.√7.推理判断题。通读全文内容，尤其第一段“AtinyAlaskavillagehasexperiencedaboomintourism…”第三段中的“Asmoreattentionwasgiventotheplight（困境）ofpolarbears”和最后一段中的“Thevillagershavebenefitedalotfromthat.Inturn，they…development.”可知，北极熊被迫登上陆地原本是一种困境，但却促进了一个村庄的旅游业的发展。D项“事物都有两面性”可以描述本文介绍的内容。故选D项。【答案】

【语篇解读】本文是一篇说明文。气候变暖导致海冰融化，北极熊待在陆地，为阿拉斯加的一个小村庄带来了巨大的人气，促进了当地旅游业发展，当地人又用旅游业的收入为北极熊提供积极的保护。C

Ifyou’veeverworriedthatwe’vesolvedallthemysteriesofnature，fearnot.Minnesota’sDevil’sKettleFallshasbeenattractinghikersandgeologistsforgenerations.Atthefalls，alongLakeSuperior’sNorthshore，ariverforksatarockoutcrop.Whileonesiderunsdownatwo-stepstonebankandcontinuesonlikeanormalwaterfall，theothersidevanishesintoadeepholeanddisappearsapparentlyforever. AndthisbafflingsituationonlygetsstrangewhengeologistsstartexplainingDevil’sKettle.Consider，forinstance，thesheerquantityofwaterpouringintothekettleeveryminuteofeveryday.Whiletheideaofsomekindofbroad，undergroundriverisanexcitingdeviceinmovies，therealityisthatthosesortsofdeepcavesarerare. Anotherideaisthatmillionsofyearsago，ahollowlavatubemayhaveformedbeneaththefalls，inthesubsurfacelayerofbasalt（玄武岩）.Overtime，thetheorysuggests，thefallingwatereroded（侵蚀）thesurfaceandfellstraightdownintotheancientlavatube，providingwide-openaccesstothefloorofLakeSuperior.Again，thereareproblemswiththistheory，becausenolavatubeshaveeverbeenfoundinanyofthehundredsofexposedbasaltbedsinthearea. InFebruary2017，scientistssaidthatwaterthatdisappearsintotherockatDevil’sKettleresurgesinthestreambelowthefalls.Toconfirmthetheory，scientistsplanonconductingadyetraceduringalow-waterflowperiod.They’llpouravegetable-baseddyeintothepotholeandwatchwherethedyeresurfaces.Thisisafluorescent（发荧光的）biodegradabledyethat’snoticeableat10partsperbillion，sothescientistswilluseonlyafewquarts. “Whatwethinkishappeningisthewaterisgoinginthekettle，andcomingupprettyclosetoimmediatelydownstreamofthefalls，”Greensaid.

Greenadmitsthatifthedyeisfoundbelowthefallslikethescientistssuspect，thenmuchoftheDevil’sKettleFallsmysterywillbegone.“There’salittlebitofthat，”hesaid，“thatfolksaren’tgoingtostandthereandwonder.Butitwillstillbeafascinatingspot，andabeautifulspot.”8.Whatisthepurposeofwritingthefirstparagraph？A.Toexplaintheformationofwaterfalls.B.Tointroduceamysteriousnaturalphenomenon.C.Todescribeabeautifullandscapescene.D.Torecommendanunusualwaterfalltoreaders.√8.推理判断题。通读第一段内容，尤其第一句“Ifyou’veeverworriedthatwe’vesolvedallthemysteriesofnature，fearnot.”和最后一句“Whileonesiderunsdown…disappearsapparentlyforever.”可推知，第一段用明达苏尼州的魔鬼水壶瀑布的例子来说明自然界还有未解之谜。故选B项。9.Whatdoestheunderlinedword“baffling”mean？A.Astonishing. B.Interesting.C.Puzzling. D.Challenging.√9.词义猜测题。根据第一段中的“Whileonesiderunsdown…disappearsapparentlyforever.”可知，魔鬼水壶瀑布的一侧正常流淌，另一侧却在洞穴里消失。由此推知，画线词意为“令人困惑的”，与puzzling意义一致。故选C项。10.Whatcanweinferfromthe2017theory？A.Ithasn’tbeenprovedyet.B.Itisconsideredridiculous.C.It