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如图所示,一匀强电场的电场线与圆O所在平面平行,AB为圆的一条直径,C为圆周上点,圆的半径为R,∠AOC=30°,在A点有一粒子源,能向圆O所在平面内各个方向以动能Ek发射同种带电粒子(不计重力),...
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高三下学期物理《》真题及答案
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如图所示AB.CD为一圆的两条直径且相互垂直O.点为圆心.空间存在一未知静电场场强方向与圆周所在平面
点运动到C.点,动能减少了W.;又从C.点运动到
点,动能增加了W.,那么关于此空间存在的静电场可能是( ) A.方向垂直于AB并由O.指向
的匀强电场 B.方向垂直于AB并由C.指向O.的匀强电场 C.位于O.点的正点电荷形成的电场
位于D.点的正点电荷形成的电场
如图所示在匀强电场中有一半径为R.的圆O.场强方向与圆O.所在平面平行场强大小为E.电荷量为q的带正
点进入圆形区域中,只在电场力作用下运动,从圆周上不同点离开圆形区域,其中从C.点离开圆形区域的带电微粒的动能最大,图中O.是圆心,AB是圆的直径,AC是与AB成α角,则( )
A.匀强电场的方向沿AC方向;
匀强电场的方向沿OC方向;
从A.到C.电场力做功为2qERcosα;
从A.到C.电场力做功为2qER cosαsinα。
如图所示电子从A.点以速度v0平行匀强电场等势面沿AO方向射入电场图中的平行线为匀强电场的等势面由B
如图所示AB.CD为一圆的两条直径且互相垂直O.点为圆心空间存在一未知静电场方向与圆周所在平面平行现
点运动至C.点,动能减少了W.;又从C.点运动至
点,动能增加了W.,那么关于此空间存在的静电场可能是;( ) A.方向垂直于AB并由O.指向
的匀强电场, B.方向垂直于AB并由C.指向O.的匀强电场, C.位于O.点的正点电荷形成的电场,
位于D.点的正点电荷形成的电场。
如图所示图中五点均在匀强电场中它们刚好是一个圆的四个等分点和圆心已知电场线与圆所在平面平行下列有关圆
a点的电势为6V
a点的电势为-2V
O.点的场强方向指向a点
O.点的场强方向指向电势为2V的点
如图所示abcd为某匀强电场中的四个点且ab∥cdab⊥bcbc=cd=2ab=20cm电场线与四边
如图所示AB.CD为一圆的两条直径且相互垂直O.点为圆心.空间存在一未知静电场场强方向与圆周所在平面
点运动到C.点,动能减少了W.;又从C.点运动到
点,动能增加了W.,那么关于此空间存在的静电场可能是( ) A.方向垂直于AB并由
指向O.的匀强电场 B.方向垂直于AB并由O.指向C.的匀强电场 C.位于O.点的正点电荷形成的电场
位于D.点的正点电荷形成的电场
如图所示圆O在匀强电场中场强方向与圆O所在平面平行带正电的微粒以相同的初动能沿着各个方向从A点进入圆
沿AB方向
沿AC方向
沿OC方向
沿BC方向
如图所示abcd为某匀强电场中的四个点且ab∥cdab⊥bcbc=cd=2ab=20cm电场线与四边
如图所示在水平向右的匀强电场中在O.点固定一电荷量为Q.的正电荷abcd为以O.为圆心的同一圆周上的
a、c两点的场强相同
b点的场强大于a点的场强
da间的电势差大于ab间的电势差
检验电荷在a点的电势能等于在c点的电势能
如图所示图中五点均在匀强电场中它们刚好是一个半径为R=0.2m的圆的四个等分点和圆心O..bcd三点
a点的电势为4V
O.点的电势为5V
电场强度方向由O.点指向b点
电场强度的大小为10
v/m
如图所示图中五点均在匀强电场中它们刚好是一个半径为R=0.2m的圆的四个等分点和圆心O..bcd三点
a点的电势为4V
O.点的电势为5V
电场强度方向由O.点指向b点
电场强度的大小为10
v/m
如图所示AB.CD为一圆的两条直径且相互垂直O.点为圆心空间存在一未知静电场方向与圆周所在平面平行现
点运动至C.点,电势能减少了E
P
;又从C.点运动至
点,电势能增加了E
P
,那么此空间存在的静电场可能是
A.匀强电场,方向垂直于AB由O.点指向
点B.匀强电场,方向垂直于AB由C.点指向O.点C.位于O.点的正点电荷形成的电场
位于D.点的负电荷形成的电场
如图所示图中五点均在匀强电场中它们刚好是一个圆的四个等分点和圆心已知电场线与圆所在平面平行下列有关圆
a点的电势为6V
a点的电势为-2V
O.点的场强方向指向a点
O.点的场强方向指向电势为2V的点
在地面上方空间有一匀强电场在该电场中有一个的点电荷以O为圆心R=10cm半径作一圆该圆面与匀强电场的
如图所示圆O.在匀强电场中匀强方向与圆O.所在平面平行带正电的微粒以相同的初动能沿着各个方向从
点进入圆形区域中,只在电场力作用下运动,从圆周上不同点离开圆形区域,其中从C.点离开圆形区域的带点微粒的动能最大,图中O.是圆心,AB是圆的直径,AC是与AB成α角的弦,则匀强电场的方向为 ( ) A.沿AB方向
沿AC方向
沿BC方向
沿OC方向
如图所示在匀强电场中有一半径为R.的圆场强方向与圆所在平面平行大小为E.电荷量为q带正电微粒以大小相
如图所示在匀强电场中abcd为矩形的四个顶点ef分别为ab边和cd的中点且ab长为ad长的2倍.已知
d点的电势为2V
电场线方向垂直于ac向下
电场线方向垂直于ec向下
一电子从a点运动到c点,电势能减少
如图所示abcd为某匀强电场中的四个点且ab∥cdab⊥bcbc=cd=2ab=20cm电场线与四边
如图所示AB.CD为一圆的两条直径且相互垂直O.点为圆心.空间存在一未知静电场场强方向与圆周所在平面
点运动到C.点,动能减少了W.;又从C.点运动到
点,动能增加了W.,那么关于此空间存在的静电场可能是( )
A.方向垂直于AB并由O.指向
的匀强电场 B.方向垂直于AB并由C.指向O.的匀强电场 C.位于O.点的正点电荷形成的电场
位于D.点的正点电荷形成的电场
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30分ItwasournormalThursdaymorningbusinessmeetingatourreal﹣estateoffice.Beforethemeetingwe41aroundthetableasusualwithourcoffee.Heanewfaceinaroomfullofoutgoingsalespeoplestoodasidelookingalittleshyand42.Iwentoverto43withhim.Maybehewasanew44? HesaidhewasaMarinejustbackfromKabulAfghanistan.Ourofficeandalocalschoolhadbeen45bysendingletterstohimandothertroopswhichhehadpostedontheAmericanEmbassydoorInKabul. Hecametoourofficetothankusforoursupportforallthe46duringthose47times.Icouldn'tbelievemyears.Hewantedtothankus?Weshouldbethankinghim.Buthow?HowcanIevershowhimmy48? Attheendofthesalesmeetinghesteppedforward49.Hestilllookedlikeashyl5﹣year﹣oldboy. ThisyoungMarinethisclean﹣facedboyhadno50infacingbulletsonthebattlefieldsothatImightenjoythefreedomtolivemy51life.Suddenlythemost52concernsofmylifeandcareerseemedasnothingandmyself﹣satisfactionflewrightoutofthewindowwithhiseveryword. He53forwardtoourmanagerand54aproperlyfoldedAmericanflaginhishands.Ithad55overtheEmbassy.Hesaidthanksagain.AsI56Isawredfaceseverywhereholdingbacktears. In57homesinsmalltownskidslikehimaregrowingup58tobeanAmerican.We'llframetheflagandputitinthehall.TheyoungAmericanMarineonlycametomyofficeonceandforjustafewminutesbutI59Iencounteredgreatnessinthefleshandinthetwinklingofaneyemylifewasforever60. 41.A.paced B.saw C.hung D.talked 42.A.strange B.brave C.awkward D.scared 43.A.accompany B.chat C.sit D.play 44.A.marine B.customer C.manager D.salesman 45.A.supportive B.positive C.active D.attentive 46.A.donation B.letters C.money D.medicines 47.A.pitiful B.exciting C.wonderful D.tough 48.A.admiration B.appreciation C.expectation D.satisfaction 49.A.quietly B.happily C.livelily D.shamefully 50.A.intention B.courage C.hesitation D.relation 51.A.fruitful B.painful C.regretful D.peaceful 52.A.stressful B.confusing C.academic D.unrealistic 53.A.looked B.pushed C.walked D.struggled 54.A.exchanged B.received C.placed D.rewarded 55.A.run B.fought C.manufactured D.flown 56.A.lookedout B.lookedaround C.lookedup D.lookedaway 57.A.usual B.ordinary C.crowded D.wealthy 58.A.proud B.anxious C.courageous D.ashamed 59.A.promised B.insisted C.expected D.realized 60.A.understood B.changed C.maintained D.ruined
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法国学者贝特朗发现在研究事件A“在半径为1的圆内随机地取一条弦其长度超过圆内接等边三角形的边长”的概率的过程中基于对“随机地取一条弦”的含义的不同理解事件A的概率PA存在不同的容案该问题被称为贝特朗悖论现给出种解释若固定弦的一个端点另个端点在圆周上随机选取则PA=
如图在矩形ABCD中AB=2AD=2E为AB的中点将△ADE沿DE翻折到△A1DE的位置A1∉平面ABCDM为A1C的中点则在翻折过程中下列结论正确的是
6分Cheatingisnothingnew.Butit'sbecomingalotmoresophisticated.Republicanvice﹣presidentialcandidateSarahPalinwascaughtoutonce.Aphototakenafterthespeechshe'dgivenonareturntoconservativeprinciplesshowedherlefthandcoveredwithcribnotes.TheseincludedthewordsenergybudgetcutstaxandliftAmericans'spirits.Thewordbudgethadbeencrossedout.Videofootagealsoshowedherreadingfromherhandwhenaskedwhattopthreethingsaconservative﹣ledcongressshoulddo.Writingnotesonyourhandisonewaytocheatinanexam.Butthesedaysit'saloteasier…especiallywiththeInternet. Anyonewhowantstocheatinanexamcanprobablyfindtheanswersonline.Therearehundredsofsitesofferingsolutionstoallsortsoftests.Andit'salucrativebusiness.OneoperatorinOregonmade﹩700000inaboutninemonthsbeforehisarrest.TheownerofawebsiteinOhiopocketedmorethan﹩300000.Andafamousoverseassiteisestimatedtosellabout146000setsofanswersandtakeinabout﹩10millionperyear.Actuallygettingholdoftheexamanswersisn'tthathard.Somedotheexamthemselvesandusebuttoncamerasordocument﹣scanningpenstocopythetests.Othersorganizeforagrouptotaketestsrepeatedlyuntiltheycanmemorizetheentireexambetweenthem.Otherssimplybribeexamadministrators. Atthemomentsuchbusinessisbooming.Moreandmorecompaniesnowrequiretheiremployeestotakeprofessionalexams.Andhundredsofbusinessesandtradeorganizationshaveintroducedformalcertificationprogramstomeasureemployeeskills.IntheUSaloneatleast2millionexamsaretakeneveryyearforinformationtechnologycertification.Butemployeesalsohavetotakeexamsforallsortsofprofessionsfromcraneoperatorstocourtreporterstoschoolbusdriversandfinancialplanners.Testofficialsestimatethathundredsofthousandsoftest﹣takershaveusedtheInternettobuyanswersforprofessionaltests.Andarecentsurveyfoundthat28percentoftestcentreshadatleastonecheatingincidentoverthelastfiveyears.Inoneincidenttensofthousandsofsoldiersobtainedanswerstotestsinarangeofmilitaryskills. Manyseethisasacauseforconcern.Manytestsareforworkinsensitiveareassuchasdefenceinstallationsandhospitals.Nowhowwouldyoufeelifyouknewthatthepeopleinchargeofthecomputerscontrollingnuclearweaponsmighthavecheatedintheirtestsandmaynotreallyknowwhatthey'redoing? 1WhydoestheauthormentionSarahPalininthefirstparagraph? A.Toshowmuchdisagreementastocheatingamongpoliticalleaders. B.Todiscourageaveragepeoplefromwritingnotesontheirhands. C.Toexhibitthefactthatcheatingiscommoninvariousfields. D.Tointroducethenegativeinfluencesofcheatinginfrontofthepublic. 2TheunderlinedwordlucrativeinParagraph2isclosestinmeaningto. A.profitable B.stable C.ripe D.fresh 3Whatisthemaincauseofmorecasesofcheating? A.Theformationofemployeeskills. B.Therequirementoftakingprofessionalexams. C.Thepopularityofthecheatingindustry. D.Theavailabilityofinformationtechnology.
6分ParentsinSpainarebeingurgedtogoonaweekendhomeworkstrikethismonthinprotestagainsttheunacceptableamountofafter﹣schooltaskstheirchildrenaregiven.ThehomeworkloadofSpanishchildrenhaslongbeenasorepointwithsomeparentswhoarguethattheburdenistoogreatplacestoomuchpressureonpupilsandeatsintofamilytime. AccordingtoastudybytheOrganizationforEconomicCo﹣operationandDevelopmentOECDSpanish15﹣year﹣oldshave6.5hoursofhomeworkaWeekcomparedwithanaverageof4.9acrossthe38OECDcountries.TheSpanishConfederationofAssociationsofMothersandFathersofStudentsCeapaiscallingonparentswhosechildrenattendSpanishstateschoolstoboycottweekendhomeworkinNovember. We'velostabitofcommonsenseinthiscountrywhenitcomestotalkingabouteducationandwe'vegotasysteminwhichboys'andgirls'freetimehasdisappearedsaidJosLuisPazospresidentofCeapa.Schoolsarepassingontaskstofamiliesthattheyshouldn'tbe.Itstartswithchildrenfromtheagesofthreetosixdoinghalfanhour'shomeworkeveryday.Forusthat'sanunacceptablesituation. PazossaidCeapadisagreedwiththebeliefthatchildrenshouldendurehugeamountsofhomeworkinthehopethatitwouldensurethemabetterfuture.Theyshouldbe.happywhenthey'relittleandthatlifeisn'tjustaboutsomeonetellingyouthatyouhavetosufferinexplicably难以理解地.Themodelneedstochangebecausesocietyhaschanged. Schoolchildrenhavetofittheirhomeworkaroundtheschooldaywhichvariesfromregiontoregionandschooltoschoolbutstartsearlyfromaround8amor9amandfinishesanywherebetween2pmand5pm.Howeverschoolsareincreasinglyusingan8am﹣2pmtimetabletosavemoneyandinthefaceofevidencethatsuggeststhelongerhoursdonotyieldbetterresults. AspokesmanfortheeducationdepartmentofMadridsaidhomeworkwasamatterforindividualschoolsratherthanregionalgovernments.They'retheoneswhoknowbestwhattheneedisineachcase. 1WhyareparentsinSpainbeingcalledontogoonastrike? A.Tostopschoolviolence. B.Toaskforlongerschooltime. C.Tosaynotoheavyhomeworkload. D.Torequestequaleducationfortheirkids. 2WhichofthefollowingwouldCeapaagreeto? A.Longerschoolhourswillensurebettergrades. B.Happinessisthemostimportantthingforachild. C.Hugeamountsofhomeworkmeansabetterfuture. D.The8am﹣2pmtimetableissuitableformostchildren. 3Whichofthefollowingshouldberesponsibleforstudents'homeworkaccordingtothespokesman? A.Ceapa. B.TheOECD. C.Regionalgovernments. D.Eachindividualschool.
8分I'maspeedreader.HavebeensinceIwasateen.Motherworkedforthecontinuingeducationdepartmentofauniversityandtheywereofferingaclassonspeedreadingandneededonemorepersontofillouttheclass.Ibecamethatoneperson. Theclassmetforonlyanhourortwoforafewweeksbutwhenthegoalofaclassisspeedyoudon'tneedtomeetforlong.Theinstructorsaidtomakeoureyesgoacrossthelinesofwordsasfastastheycouldandnottobeconcernedaboutwhatthewordsmeant.IreadAnimalFarmin10tenminutes.Covertocover.Theinstructoraskedwhatthebookwasabout.IsaidIdidn'tknowbutifIhadtoguessI'dsayitwasaboutanimalsonafarm.Helookeddispleased. I'vebeenspeedreadingeversince.Ican'tstopandIcan'tslowdown.TodayforexampleIplanonreadingChurchill'sHistoryoftheEnglishSpeakingPeoplesoverlunch.Ihopeit'smorememorablethanAnimalFarm. Asaresultofallthisspeed﹣readingIoftenexperienceadelaybetweenwhatIthinkIreadandwhatsomethingactuallysays. TheotherdayIpassedbyamallwithalargesignthatsaidAutoTheftSale.Ithoughthowefficientitwasforautothievestosimplysellallthestolecarsinabigtentatthemall.Ahalf﹣milelateritdawnedonmethatthesignhadsaidAutoTentSale. EverytimeIdrivethroughaconstructionzoneIgasp屏气.ThesignsaysHitaWorker﹩10000about62000yuan.Itreadslikethey'reofferingareward.Ofcourseit'snotanoffer.It'sjustthatmyeyesrarelytakeinthelastlinethatsaysFine.It'sa﹩10000fineifyouhitaworker.Someonereallyneedstorephrasethatone. Speedreadinghasbittenmeonthebacksidemorethanonce.Especiallyasawriter.Justaskanyofmyeditors. 1Whywastheauthorabletoattendclassesonspeedreading? A.Shetookachanceandfilledonevacancy空缺. B.Shewastheonlyteenagerapplicantfortheclass. C.She'dalreadypracticedspeedreadingbefore. D.Hermotherfoundhergiftedinspeedreading. 2Whatlefttheinstructorunsatisfiedintheclass? A.IttooktheauthortenminutestocompleteAnimalFarm. B.Theclasswasonlyanhourortwoforafewweeks. C.Theauthorreadfastbutdidn'tgetthemainideaofthebook. D.Alltheclassactuallyfailedtofollowhisadvice. 3Theauthortendstoprovethatthereisalwaysadelayinherunderstandingafterspeedreadingby. A.makingcomparisons B.analyzingcauseandeffect C.drawingaconclusion D.givingexamples 4Whichofthefollowingbestdescribestheauthor? A.Talentedandproductive. B.Truthfulandhumorous. C.Carelessandquick﹣tempered. D.Proudandhot﹣headed.
平行四边形ABCD中M是BC的中点若则λ+μ=
2分ThenthatDollyhadbecomeseriouslyill.CloningscientiststofindthatDolly'sillnessweremoreappropriatetoamucholderanimal.
10分ToreachonelocalrestaurantabowlofChinesenoodlestravelsacrosstheEurasiancontinentandsettlesontheScandinavianPeninsula1placebeforehungrypeoplevisitingthehomeofSantaClaus. AChinesemanbroughtlocaldishesreganmianandhotpottoRovaniemiFinlandbecomingthefirstChinese2openanrestaurantintheArcticCircle. HuLiangfromCentralChina'sHubeiprovincemigratedtoFinlandaftergraduationat21.Fortwelveyearhe3seemoreandmoreChinesetouristsvisitingthecountrytoenjoythewinterholidayAuroraBorealis北极光﹣andofcoursethepurported传说的homeofSantaClaus. Chinesepeoplearebecoming4richandmoreinternational.5hasnotchangedistheir6stomach.SoImade7decisiontoopentherestaurant. Hu'srestaurantservesreganmianatraditionalWuhannoodledishwithspicyflavorandasesamepaste芝麻酱dressingaswellasChinesehotpot.HeordersfoodmaterialsfromChinesetradecorporationsthroughe﹣commenceplatformsand8e﹣paymentpopularamongChinesepeoplesuchasAlipay. 9apriceof15euro$18.45abowlofreganmianisnotonlygreatcomfortforChinesetouristswhohavetraveledfromthousandsofmiles10butalsoanattractiontolocalFinns.
1分Whynotkeepadictionaryathandforc?Youcanlookupintothedictionarywheneveryoumeetnewwords.
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号^并在其下面写出该加的词. 删除把多余的词用\划掉. 修改在错的词下画一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. YoucanfindallkindsinformationinjustafewminuteontheInternet.It'slikegoingtoahugelibrarywithouthavingtowalkaroundtofindyourbooks.RecentlymanypeoplehadbeendiscussingthedangersoftheInternet.TheyhavebeenreportsinAmericaaboutpeopletryingtostealpersoninformationforbadpurposes.FindinformationOntheNetiseasy.Sonotallinformationisgoodtooursociety.Foranexampleyoucanfindsoinformationashowtokillpeople.Theproblemwillbecomelessseriousinthefuture.
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.错误涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号/\并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下面划一横线并在该词下面写出修改后的词. 注意1.每处错误及修改均限一词2.只允许修改10处多者从11处起不计分. Iwillshareoneexperiencewithyou.WiththecollegeEntranceExaminationdrawnearIwasfilledwithgreatanxiety.HoweverIcouldn'tbeabsorbedinstudyresultingfrommyfailingintheexamination.Igotverydiscouraging.JustthenmyteacherMissZhangapproachedtomeandsaidInlifeweallhavemomentswhenwecan'tachievewhatwewant.Itisnatural.Don'tallowthosemomentstoweakenyouandturnthemintomotivationtoinspireyourself. Herwordswerereminderthatprovidedmewithconstantencouragementtosmileatlife.ConsequentlyIgainedthatIdeserved. Soitisanoptimisticattitudewhichmattersmostofall.Itgivesyoutheconfidencetodealwithdifficultiesandtoachievewhatyouwantinyourlife.
“微信运动”是腾讯开发的一个记录跑步或行走情况步数里程的公众号用户通过该公众号可查看自己某时间段的运动情况.某人根据2018年1月至2018年11月期间每月离步的里程单位十公里的数据绘制了下面的折线图.根据该折线图下列结论正确的是
30分IwaslivinginSaoPauloBrazil.Itisa1citywithmorepeoplelivinginitthaninmywholecountry.Werentedaflatinaguardedcommunitybuttherewasafavela贫民窟quite2. ForseveralmonthsIdidn'thaveacar3threetimesaweekItookbusestogotothecitycentre.Duringthese4Iwouldridewiththepeoplewhotookthesamebusfromthefavelatogotowork.WhenIgotonthebusalltheseatswerealready5.Butwhenpeoplesawthatmybagwas6theyofferedtoholditontheirlegstomakemefeellighter7.AtfirstIwas8.ThenIrealizedthatthesepeoplehadabsolutelyno9tostealfrommetheyonlywantedto10. OnceonmywaybackIhadto11alongtimeatabusstop.Iwas12exceptforawomanwhowas13verypoor.Shecarriedasmallpaperbagofpopcornandnothingelse. Whilewewerewaitingshewalkedoverand14mesomepopcorn.I15herbutdidn'twanttohelpmyselftoit.Shethenrepeatedly16thatItakefromwhatwasclearlyher17food. ThatwasthefirsttimeIhadthoughtabouthowpeoplewhohavealmostnothingaresometimesableto18thelittletheyhavemore19thanthosewhoownalot.Iwonderifit'struethatthemoreyouhavethebiggertheburdenandthedifficultytoshareanythingwithothers.Iwassomovedbythatwoman'ssimple20thatday.Iclearlyhadmorethanshedidbutshenaturallyandjoyfullysharedwhatlittleshehadwithme. 1A.small B.beautiful C.warm D.huge 2A.similar B.near C.quiet D.noisy 3A.so B.because C.but D.or 4A.visits B.weekends C.holidays D.trips 5A.checked B.reserved C.emptied D.taken 6A.light B.big C.heavy D.worn 7A.standing B.sitting C.walking D.carrying 8A.doubtful B.disappointed C.appreciated D.satisfied 9A.patience B.intention C.chance D.approach 10A.greet B.meet C.help D.change 11A.lookfor B.askfor C.sitfor D.waitfor 12A.nervous B.hungry C.alone D.scared 13A.really B.obviously C.probably D.especially 14A.offered B.bought C.sold D.made 15A.refused B.thanked C.doubted D.promised 16A.argued B.ordered C.pretended D.insisted 17A.delicious B.special C.only D.sweet 18A.provide B.share C.sell D.present 19A.anxiously B.commonly C.easily D.skillfully 20A.generosity B.respect C.confidence D.encouragement
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