Unit 2 Healthy Lifestyle单元综合检测（含解析）高中英语人教版（2019）选择性必修 第三册

12/12单元综合检测(二)第一部分阅读第一节阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项。AWith1，500squaremilestoexplore，fromitsromanticattractionstoitswildlandscapesandtheeasyrurallifestyle，therearenodecentpublicfacilitiesbutcertainlynoshortageofbeautifulplacestostaywiththeLakeDistrict．Seebelowourhand-pickedselection．UlverstonLinedwithcharmingcobbledstreets，UlverstonisaprettyhistoricmarkettownlocatedjustSouthoftheLakeDistrict．Itisadelightfulescapefromthecrowd-filledattractionsintheSouthernLakes，yetisjustastone'sthrowawayfromthem．GrasmereGrasmereisforeverlinkedtotheworld-renownedLakelandpoets，mostnotablyWilliamWordsworth．Eachyear，manymakethetraveltoDoveCottageinGrasmere，wheresomeofWordsworth'smostfamousworkswerewritten．Fromtoweringpeakstotastytreats，aholidayinGrasmerewouldalsonotbecompletewithoutatasteofthefamousGrasmereGingerbreadthat'sbeenmadeheresincethemid-19thcentury．CartmelHometomanytraditionalstonebuildingsandcharmingscenery，CartmelisaprimitivevillageinSouthCumbria．Appreciatingthecolorfulglasswindowsandsculpturesmakesitamemorablevisit．Cartmel'sstickypudding，atraditionalEnglishdessertfromthisLakeDistrictvillage，isamusttry．Cartmel'srestaurantsandpubsprovideawiderangeoffoodsanddrinkstorechargethebatteriesafteranexhaustinghike．KendalKnownasthegatewaytotheLakes，Kendalisabusytownhostingaselectionofrestaurantsandshops，whichmakesitanexcellenttouringbase．Youcanalsoenjoythesurroundingviewsoflandscapesandlakesfromthehilltop．BothWindermereandtheCumbriancoastareeasytoreach，makingitafinelocationforloversofbothcoastandcountryside．1．WhatattractthetravelerstotheLakeDistrict?A．Luxuriousfacilities．B．Mysteriousadventures．C．Leisurelycountrysidesights．D．Convenienttransportationsystems．2．Whichdestinationbestsuitsloversofliterature?A．Ulverston． B．Grasmere．C．Cartmel． D．Kendal．3．WhatcantouristsdoatCartmel?A．Chargethebatteryforfree．B．Tasteauniquelocalsnack．C．Bicycleintheoldvillage．D．Admiremodernarchitectures．BLoveisoneoflife'sgreatestmotivators．ThatisexactlywhatinspiredZacktodesignafullyelectricoff-roadwheelchairforhisgirlfriendsufferingfromparalysis．Likemostwheelchairusers,Cambryhasalwaysbeenrestrictedtothepavementformostofheradultlife．Asidefromthat,usingawheelchairacrosslongdistancesmakeshershouldersache．ZackNelson,herboyfriend,wantedtogivehertheabilitytoexploremoreplacesconveniently,sohemadeaspecialwheelchairforher,whichwouldmakeitpossible．Zackbeganbycombiningtwoelectricbikesandinstallingaseatinthecenter．Itworked!Cambryexperiencedawholenewleveloffreedomusinghernew“ride”，andshecouldn'tbemoregratefultoZackforcomingupwithit．Fastforwardtoayearlater,CambryandZacktiedtheknot．Theyalsobeganmassproductionofthespecialwheelchair．Throughoutthattime,theyimprovedtheoriginaldesigntomakeitamorereliableoff-roader．Whilesimilarvehiclesalreadyexistinthemarket,theysaidthey'reeithersloworcostasmuchasacar．CambryandZackwantedtobuildsomethingquick,light,superlong-range,andaffordableatthesametime．However,comingupwiththatkindofelectricoff-roaderwasn'teasy．Thetoughestchallengewhendevelopingthespecialwheelchairistheprice．“Wewantedtocreatesomethingthatisaffordableforeveryone．Findingqualitycomponents,andasimpleenoughdesignatthecheapestpricepossiblytookquiteabitoftime，”saidZack．“ButIthinkwehavesomethingnowthateveryonewillbeabletoenjoy,atafraction(少量)ofthecostofother‘off-roadwheelchairs’currentlyonthemarket．”Anothergreatthingaboutthevehicleisthatit'ssilent．Itsriderwillhavenodifficultychattingwiththeircompanionwhileusingit．CambryandZackareveryhappywiththefullyelectricmachine,andtheyhopethatotherwheelchairuserswillalsobenefitfromit．4．WhatwasZack'smotivationtoinventafullyelectricwheelchair?A．Themarketdemands．B．Hisinterestininvention．C．Hisloveforhisgirlfriend．D．Therequestofhisgirlfriend．5．Whatdoestheunderlinedword“it”inparagraph2referto?A．Walkingonthepavementwithease．B．ThespecialwheelchairmadebyZack．C．Theabilitytoexploremoreplacesconveniently．D．Cambry'sdesiretoreducethepainofhershoulders．6．WhatdoesZackthinkoftheexistingwheelchairsinthemarket?A．They'relight．B．They'reexpensive．C．They'reugly．D．They'resmall．7．WhatcanwelearnaboutZackfromthelastparagraph?A．Hehasanambitiontointroducethewheelchairtoothers．B．Heissatisfiedwithpeople'sreactiontothewheelchair．C．Hecouldn'taffordthecomponentsofthewheelchair．D．Hespentmanyyearsdesigningthewheelchair．CAlmosteverymonth，anewpieceofresearchappearslinkingdietshighinprocessed“junk”foodswithobesityandpoorhealth．Itisn'tyetcleariftheyhaveacause-and-effectrelationship．Butdeeperresearchisstartingtoappearfromtrialsthatcomparedietswhicharebasedoneitherextremelyprocessedfoodsorwholefoods(天然食品)，yetarecarefullymatchedfornutrientsinallotherways．Thelinksneedinvestigatingasamatterofurgency．Iftheseprocessedfoodsreallydocarryessentialhealthrisks，itcouldmeanthatofficialadviceabouthealthyeatinghasbeenaimingatthewrongtargetfordecades．Inalmostallhigh-incomecountries，nutritionguidelinessaythekeytohealthyeatingisavoidingtoomuchfat，saltandsugar．Whilemanytypesofprocessedfoodscontainsignificantquantitiesofthesenot-well-thought-ofingredients，notalldo，andtherearewholefoodsthatarealsohighinsomeofthem．Redmeatandsomedairyproductscomewiththeirshareoffat，forinstance．Itisstillunclearifitisbettertoswitchto“healthier”low-fatversionsofprocessedfoods，ortocookfromscratch，whatevertheingredients．Equallynotcleariswhatactiongovernmentsshouldbetaking．Somecampaignersarenowcallingforhighertaxesonfactory-madefoods．Thatwouldbecontroversial，however，becausethesefoodsmakeupto60percentofpeople'sdietsincountriessuchastheUKandtheUS．Additionally，anypriceincreaseislikelytohitlower-incomehouseholdshardest，manyofwhichconsumemoreofsuchproductsbecauseprocessedfoodscanbecheaperthanmakingmealsfromtheiroriginalingredients，andthecostdifferenceisevengreaterifyoutakeintoaccountthetimetakentocookfromscratch．Ratherthantaxation，amostpracticalapproachmaybeforschoolstostartteachingpupilshowtomakequickandsimplehome-cookedmeals．Thisapproachwouldtakemanyyearstobearfruit，astheencroachment(侵蚀)ofprocessedfoodsintoWesterncuisinetookplaceoverdecades．Itisn'tgoingtobecompletelychangedovernight．8．Whatcanbelearnedaboutprocessedfoods?A．Theyaremorenutritiousthanwholefoods．B．Theycanhelpavoidbeingoverweightandunhealthy．C．Theyhavelessfat，saltandsugarthanwholefoods．D．Theydon'tnecessarilycarrysuchhighhealthrisks．9．Howdoestheauthordevelopparagraph3?A．Bygivingreasons．B．Bylistingfacts．C．Byansweringquestions．D．Byshowingastudyresult．10．What'stheauthor'sattitudetowardshighertaxationonprocessedfoods?A．Favorable． B．Tolerant．C．Opposed． D．Carefree．11．Whatwillbethefutureofprocessedfoods?A．Theywillbeover-taxed．B．Theywillstillexistinpeople'sdietsforsomeyears．C．TheywillberemovedfromWesterncuisine．D．Theywillbereplacedbyhome-mademealssoon．DLessthanaquarteroffamiliesinBritainsitdownfora“screen-free”dinnertogethereverydayawayfromTVs，phonesanddevices，accordingtoresearch．TheresearchwascarriedouttomarkthelaunchofVodafoneProwithAlexa，featuringaunique“Dinnertime”functionwhichallowsfamiliestohave30minutesofdigitaldowntime．Astudyof1，600parents，withatleastonechildathome，foundsixintenadmitgettingchildrentoswitchofftheirdevicesisthebiggestcauseofdisagreementsintheirhousehold，leadingtoanaverageoftwoquarrelsaday．Theresearchalsofoundittakesalmosttenminutesforachildtoswitchofftheirdevicesafterbeingaskedto．Almostallparentsfeelhavingabreakfromtechnologyisimportantforfamilyrelationships．And86percentthinkdinnertimeisanimportantpartofthedayforspendingqualitytimetogether．However，despitethis，93percentofparentsbelievetechnologyisimportantforachild'sdevelopment，with98percentusingdigitaldevicestoaidtheirlearning．Dr．AnnaColton，clinicalchildpsychologist，commented，“Technologyplaysahugepartinallofourlives，andimprovesourwork，learningandleisure．”Sheadded，“However，itisvitaltotaketimeawayfromourscreenandconnectwithfamilyandfriendsface-to-face，particularlyatmealtimes－bothforourselvesandforourrelationshipswithlovedones，todeveloprelationships．”MaxTaylor，consumerdirectoratVodafoneUK，said，“30minutesistheproperamountoftimeforfamiliestoconnectwithoneanotherawayfromscreens，becauseit'slongenoughtohavemeaningfulconversations，amealorplayagame—butnotsolongthatitfeelsworryingorstressful．”12．Whydochildrenoftenquarrelwiththeirparentsaccordingtothetext?A．Theyareunwillingtohelpwithhousework．B．Theyareurgedtoturnoffdigitaldevices．C．Theyarelatefordinnerwiththeirparents．D．Theyarestressedwithtoomuchhomework．13．WhatmessagedoesDr．Coltonmainlywanttoconvey?A．Technologyenablesfamiliestospendqualitytime．B．Screentimeisofimportancetochildren'slearning．C．Face-to-facecommunicationcanbuildgoodrelationships．D．30minutesisapropertimeformealtimecommunication．14．Howdoestheauthorpresenttheresearchfindings?A．Byprovidingsomedata．B．Bygivingsomeexamples．C．Bymakingacomparison．D．Byanalyzingthecause．15．Wherecanthetextbefound?A．Inatextbook．B．Inasciencereport．C．Inafashionmagazine．D．Inatravelbrochure．第二节阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。选项中有两项为多余选项。AsHoraceMann,thegreateducator,oncesaid,“Habitsarelikeacable．Weweaveastrandofiteverydayandsoonitcannotbebroken．”Ipersonallydonotagreewiththelastpartofhisexpression．16Habitscanbelearnedandunlearned．ButIalsoknowitisn'taquickfix．Itinvolvesaprocessandagreatcommitment．ThoseofuswhowatchedthelunarvoyageofApollo11weretransfixedaswesawthefirstmanwalkonthemoonandreturntotheearth．Wordssuchas“fantastic”and“incredible”wereinadequatetodescribethoseeventfuldays．Buttogetthere,thoseastronautsliterallyhadtobreakoutoftheenormousgravitypulloftheearth．17Habits,too,haveenormousgravitypullmorethanmostpeoplerealizeorwouldadmit．Breakingdeeplyrootedhabitualtendenciessuchasprocrastination,impatience,criticalness,orselfishnessthatviolatebasicprinciplesofhumaneffectivenessinvolvesmorethanalittlewillpowerandafewminorchangesinourlives．18Butoncewebreakoutofthegravitypull,ourfreedomtakesonawholenewdimension．19Thegravitypullofsomeofourhabitsmaycurrentlybekeepingusfromgoingwherewewanttogo．Butitisalsogravitypullthatkeepsourworldtogether,thatkeepstheplanetsintheirorbitsandouruniverseinorder．20Andwecanusethegravitypullofhabittocreatethecohesiveness(凝聚力)andordernecessarytoestablisheffectivenessinourlives．A．Iknowtheycanbebroken．B．“Lift-off”takesanenormouseffort．C．Excellenceisnotanact,butahabit．D．Itisapowerfulforceifusedeffectively．E．Habitsarepowerfulfactorsinourlives．F．Theirenergywasmostlyspentinthefirstfewminutesoflift-off．G．Likeanynaturalforce,gravitypullcanworkwithusoragainstus．第二部分语言运用第一节阅读下面短文，从每题所给的A、B、C、D四个选项中选出可以填入空白处的最佳选项。LastJuneIworkedasavolunteerinaremoteAboriginalcommunity．Theresidentsthereareshortofthemanymaterial21thatmostofusinbigcitieshave,buttheiroutlookonlifeisnotevencomparabletoours．Thiscommunitywashardhitbya22abouttwoyearsago．Manypeoplebecame23andmultiplefamilieshadtoliveunderoneroofinhousesthatwere24forjustonefamily．However,peoplefeltmoreofasenseof25whenfamilieshadtolivetogetherinsuchconditions．They26togethertohelpeachotherinrebuildingtheirlivesafterthehurricane．Familytook27overeverythinginthiscommunity．Ifsomeoneisinneed,theextendedfamilywillprovideany28needed．Childrenaretaughtfromanearlyagethatfamilyisworthmorethananymaterialpossessiontheywill29．Theypassthatvaluetothenext30，andthecyclecontinuesin31solidfamilyvalues．Onmythirddayinthiscommunity,twoelderssaidtheyhadfeltastrong32withmyspirit,andwantedtoadoptmeintotheirtribe．Itwasbeyondmy33astohowanoutsidercouldbe34afterjustthreedays!Oneoftheeldersexplainedthatnoonewasastrangerthere．Leavingthiscommunitywaschallengingindeed．Notonlydidmyoutlookchange,myunderstandingofhowlifecanbedefinedtooka35forthebetter．21．A．rewards B．possessionsC．advances D．impacts22．A．drought B．floodC．typhoon D．hurricane23．A．jobless B．anxiousC．homeless D．upset24．A．suitable B．possibleC．convenient D．necessary25．A．belonging B．humorC．timing D．hunger26．A．stood B．bandedC．defended D．grew27．A．priority B．concernC．evaluation D．preference28．A．attention B．trustC．patience D．support29．A．layout B．giveupC．comeacross D．dropoff30．A．generation B．familyC．group D．community31．A．increasing B．appreciatingC．treasuring D．sustaining32．A．contact B．connectionC．conflict D．contrast33．A．confidence B．capacityC．comprehension D．control34．A．educated B．encounteredC．attended D．accepted35．A．route B．turnC．role D．lead第二节阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。TheJiaoheAncientCityRuins，36．(locate)10kilometerswestofTurpan，XinjiangUygurAutonomousRegionisthelargest，oldestandbest-preservedearthenarchitecturalsiteintheworld，37．holdsgreatpolitical，cultural，historicalandartisticvalue．GuriBakri，a39-year-oldconservatoroftheJiaoheRuins，startsherdailyinspectionatthesiteasusual，ensuringthesafetyoftouristsand38．(make)photographicrecordsalongtheway．SheisthethirdgenerationofGuri'sfamilywhohavebeenworkingaslocalculturalconservators，39．(constant)guardingthishistoricsitesincehergrandfather40．(become)theonlyconservatorinJiaohein1961．Aftergraduatingin2013，Gurireturnedtoherhometownandbecameoneofherfather's41．(colleague)．TalkingaboutJiaohe，GurisaidthatshewouldalwaysrememberJune22，2014，whentheJiaoheAncientCityRuins42．(name)theWorldHeritageSite．Shewasproudofherparticipationintheapplication43．thetitle．Inrecentyears，thestateculturalprotectiondepartmenthasinvestedmorethan100millionyuan($14.8m)inthe44．(protect)ofJiaoheAncientCityRuins．Thisyear，JiaoheAncientCityRuinswilltakethefifthroundofstructuralreinforcement．45．teamofconservatorshasalsoexpandedto12．Thisoldcityofmorethan2，000yearsisgainingnewenergy．第三部分写作第一节假定你是李华，为了给同学们减压，上周五你校举办了一场羽毛球比赛。请你为校英文报写一篇关于该活动的报道，内容包括：1．活动目的；2．参赛人员；3．活动反响。注意：1．写作词数应为80左右；2．请按如下格式作答。ASuccessfulBadmintonMatch第二节阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文。WhenIwasalittlegirl,IknewthatIhadagiftformusic．Playingwasmylove．Whilemostkidswereoutsideintheburningsummersun,playingchildishgames,Iwashappytositinthecoolindoorsforhourspracticingmybelovedpiano．WhenIplayed,IfeltlikeIwasinawholenewworldwhereIwasfreeandeasy．AllIhadtoworryaboutwasmymusic．Playingwasneverboringforme．Ihadspentmonthspracticingandthebigdayfinallycame．ItwasthedayoftheAlbertaMusicCompetition．Themusichallwaspackedwithexcitedaudience．Isatinthefirstrowwithmymotherseatedbesideme．Asthefellowcompetitorswereplaying，Icouldn'tkeepmymindontheirmusic．Iwasjustmemorizingthenotesandpracticingthefingerings．Ihadknownmymusicwaslikethebackofmyhand．Butthistime,tomygreatsurprise,Ifoundmyfingerscompletelyoutofmycontrol．Theykeptshaking．Inearlyburstintotears．Seeingthis,mumheldmyhandstightlyinhers．Sheevenbreathedintothemasifshewantedtowarmthemup．Thenshewhisperedtomyear,“Sweetie,takeiteasy．Justlistenandenjoythemusic．”Ilookedupandturnedmyattentiontothecompetitorinthecenterofthestageforthefirsttime．Athinandtallboywassittingatthebeautifulredpiano．Helookedcalmandconfident．Hisfingertipsdancedonthekeyboard．Thesoftandgentlesoundofthepianoflewintheair．Foramoment,Itotallyforgotmynervousness．注意：1．续写词数应为150左右；2．请按如下格式作答。ThenIwasannouncedtoplaynextandIfeltanxiousagain．Suddenlymyfingersslipped(滑)andIhitawrongnote．单元综合检测(二)123456789101112CBBCCBADBCBB131415161718192021222324CABAFBGDBDCA2526272829303132333435ABADCADBCDB36．located37．which38．making39．constantly40．became41．colleagues42．wasnamed43．for44．protection45．The第三部分第一节[参考范文]ASuccessfulBadmintonMatchAwonderfulbadmintonmatchwasheldontheplaygroundofourschoollastFriday，whoseaimwastogiveusstudentsabreakfromheavyschoolworkpressure．Fivegirlsandfiveboyswerechosenfromeachclasstocompete，andtheirclassmatescheeredthemupduringthematch．Althoughitwascoldoutside，theplaygroundwasfilledwiththestudents'laughterandcheers．Theactivitywasthoughthighlyofbythestudents，whosaiditprovidedthemwithanopportunitytoenrichtheircampuslife．第二节[参考范文]ThenIwasannouncedtoplaynextandIfeltanxiousagain．Itseemedthatthousandsofbutterflieswerereallyflyinginmystomach．Mymothergavemeapatonthebackandsaidsoftly,“Justenjoyit,honey！”Ifoundencouragementandconfidenceinhereyes．Igotup,climbedupthestagestepsandbowedtotheaudience．Itriedmybesttokeepcalm．Islowlyplacedmyhandsonthekeyboard,tookadeepbreathandstartedtoplay．Tomydelight,everythingseemedunbelievablysmooth．Suddenlymyfingersslipped(滑)andIhitawrongnote．Icouldclearlyfeelthedisappointmentfromthecrowd'sdeepsigh．“Justenjoyit！”Mum'swordsechoedinmyears．Icontinuedplayingasifnothinghadhappened．SoonIfoundmyselfabsorbedinthefamiliarmusicworldagain．Eventually,whenIfinishedmylastnote,thecrowdallstoodupwithapplauseandcheering,whichwastotallyoutofmyexpectation．ThoughIdidn'twinthechampion,IknewIhadlearnedsomethingmorevaluable．Irealisedthatlearningtoenjoymusicwasmoreimportantthanthecompetitionitself．【语篇解读】本文是一篇说明文。文章主要介绍了四个让人感到非常悠闲、轻松的旅游胜地。1．C[细节理解题。根据第一段可知，是悠闲的乡村风光吸引游客到湖区来的。故选C项。]2．B[细节理解题。根据Grasmere中“Eachyear，manymakethetraveltoDoveCottageinGrasmere，wheresomeofWordsworth'smostfamousworkswerewritten．”可知，Grasmere这个目的地最适合文学爱好者。故选B项。]3．B[细节理解题。根据Cartmel中“Cartmel'sstickypudding，atraditionalEnglishdessertfromthisLakeDistrictvillage，isamusttry．”可知，游客在Cartmel可以品尝独特的当地小吃。故选B项。]【语篇解读】本文是一篇记叙文。文章讲述了爱是生活最大的动力之一。正是这种爱使Zack为瘫痪的女友设计了全电动越野轮椅。4．C[细节理解题。根据第一段可知，Zack设计全电动越野轮椅的动力是他对女友的爱。]5．C[代词指代题。根据第二段最后一句可知，it指的是方便地探索更多地方的能力。]6．B[推理判断题。根据第四段第一句可知，目前市场上的轮椅要么速度慢，要么价格贵。]7．A[推理判断题。根据最后一段最后一句可知，Zack希望其他使用轮椅的人也能从他设计的轮椅中受益，所以他有自己追求的目标——将他设计的轮椅推广给其他人。]【语篇解读】本文是一篇说明文。文章主要探讨了加工食品与健康的关系。8．D[推理判断题。根据第一段的前两句可知，尽管每个月几乎都有新的研究将加工食品与肥胖和健康状况不佳联系起来，但目前尚不明确它们之间是否真的存在因果关系。由此可推知，加工食品并不一定会带来如此高的健康风险。故选D项。]9．B[写作手法题。第三段首句为论点，即“不是所有的加工食品都含有大量的不合理成分，而且一些天然食品也含有这些成分”，后文则列举“红肉和一些乳制品的脂肪含量都很高”这一事实来阐明这一论点。因此，该段是通过列举事实的方式展开的。故选B项。]10．C[观点态度题。根据第四段中的“Thatwouldbecontroversial...hitlower-incomehouseholdshardest...”可知，在作者看来，由于加工食品在人们饮食中所占的比例比较高，征收更高的税有可能会引起争议，而且这对低收入家庭是很大的冲击。由此可推知，作者对向加工食品征收更高的税持反对态度。故选C项。]11．B[推理判断题。根据最后一段的最后两句可知，“不再食用加工食品”不会在短时间内发生，由此可推知，加工食品仍然会继续存在许多年。故选B项。]【语篇解读】本文是一篇说明文。文章主要讲述了英国的一项调查发现，只有不到1/4的家庭会每天放下电子设备一起吃饭，并介绍了一些人对此发现的观点。12．B[细节理解题。根据第二段中的“sixinten...twoquarrelsaday”可知，父母让孩子关掉电子设备是导致他们经常吵架的原因，故B项正确。]13．C[细节理解题。根据第四段中的“itisvitaltotaketimeawayfromourscreenandconnectwithfamilyandfriendsface-to-face...todeveloprelationships”可知，Dr．Colton认为远离屏幕，与家人和朋友面对面交流对建立良好关系是很重要的，故C项正确。]14．A[写作手法题。根据第二段中的“foundsixintenadmit”和第三段中的“Almostallparents...with98percent”可知，作者是通过罗列数据来呈现研究结果的，故A项正确。]15．B[文章出处题。根据第一段中的“accordingtoresearch”以及后文具体的研究内容和列举的数据可知，本文是一篇研究报告，故B项正确。]【语篇解读】本文是一篇说明文。作者主要介绍了自己对习惯的看法。16．A[由上下文可知，作者认为习惯是可以被打破的。由此可知，选项A“我知道它们可以被打破。”和上下文意思一致。故选A。]17．F[上文说明为了到达月球，宇航员要脱离地球的巨大引力。由此可知，选项F“他们的精力主要花在升空的最初几分钟。”和上文意思一致。故选F。]18．B[由上下文可知，作者认为我们可以“摆脱地心引力”，但是需要付出许多努力。由此可知，选项B“‘升空’需要