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下列分子中所有原子的价电子层都满足最外层8电子稳定结构的是（ ）
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分子中所有原子最外层都满足8电子稳定结构的化合物是
NaOH
N
2
PCl
5
COCl
2
下列各分子中所有原子都满足最外层为8电子稳定结构的是
.H2O
CH4
BF3
PCl3
下列各分子中所有原子都满足最外层8电子稳定结构的是
BF
3
H
2
O
PCl
5
CCl
4
下列分子中所有原子都满足最外层8电子稳定结构的是
BeCl
2
PCl
5
CCl
4
BF
3
下列分子中所有原子都满足最外层8电子稳定结构的是
N
2
PCl
5
BF
3
H
2
O
下列关于物质结构的说法中正确的是
BF
3
、HClO分子中所有原子都满足最外层8电子结构
某元素原子最外层电子数是次外层电子数的a（a为整数）倍，则该原子核内质子数为2a+2
D
2
O分子与H
2
O分子是所含电子总数不相等的分子
在任何物质分子中都含有化学键
下列分子中所有原子的价电子层都满足最外层8电子结构的是
六氟化氙（XeF
6
）
一氧化氮（NO）
光气（COCl
2
）
三氟化硼（BF
3
）
在下列分子结构中有原子的最外层电子不能满足8电子稳定结构的是
N2
PCl3
PCl5
CO2
下列分子中所有原子的价电子层都满足最外层8电子结构的是
氟化氙（XeF
6
）
次氯酸（HClO）
二氧化碳
三氟化硼（BF
3
）
下列分子中所有原子最外层都满足8电子稳定结构的是
BF
3
CO
2
NH
3
PCl
5
下列分子中所有原子都满足最外层为8电子稳定结构的是
H
2
O
2
CO
2
SF
6
BeCl
2
下列各分子中所有原子都满足最外层8电子稳定结构的是
H
2
O
BF
3
CCl
4
LiCl
下列分子中所有原子的最外层均为8电子稳定结构的是
BCl
3
H
2
S
NCl
3
SF
6
下列分子中所有原子都满足最外层8电子结构的是
HF
CO
2
BF
3
PCl
5
下列分子结构中所有原子不能都满足最外层为8电子稳定结构的是2B.CCl4
CO
2
H
2
O
N
下列各分子中所有原子都满足最外层8电子稳定结构且共用电子对发生偏移的是
BeCl
2
PCl
3
PCl
5
N
2
下列分子为直线形分子且分子中所有原子都满足最外层8电子稳定结构的是
BeCl
2
C
2
H
2
CO
2
NH
3
分子中所有原子最外层都满足8电子稳定结构的化合物是
SiO
2
N
2
PCl
5
COCl
2
下列分子中所有原子都满足最外层为8电子结构的是
BF3
H2O
PCl5
SiCl4
下列分子的结构中原子的最外层不能都满足8电子稳定结构的是
CO
2
PCl
3
CCl
4
HCl
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如图所示水平桌面上叠放着AB两物体均与桌面相对静止不动则B物体受力个数为
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4分全副武装的警察总在__后最先到达现场的人群之中.among
10分HowtoStudySmarterNotHarderHerearesomeofourfavoritestudytipsthatwillhelpanystudentstudysmarternotharder:Reciteasyoustudy.Reciting﹣sayingthingsoutloudshouldfirsttakeplaceasyoureadthrougheachparagraphorsection.Testyourself.Thiswillhelpyoutounderstandaswellaslearnfasterbecauseitismoreactivethanreadingorlistening.1Takefullernotes.Notesshouldbeinyourownwordsbriefandclear.2Writingnoteswillhelpyoubetterthanjustunderliningasyoureadsinceitforcesyoutorewriteideasinyourownwords.3Thebesttimetoreviewissoonafteryou'velearnedsomething.Youaremorelikelytorememberthematerialatthebeginningandtheendofthelessonsomakesureyoufocusonthemiddlewhenyoureview.Sleeponit.4It'seasiertoremembermaterialyou'vejustlearnedaftersleepingthanafteranequalperiodofdaytimeactivitybecauseyourbraincontinuestothinkevenafteryou'vefallenasleep.Combinememoryandunderstanding.Therearetwowaystoremember:bymemorizingandbyunderstanding.Multiplicationtablestelephonenumbersandmathformulasarebetterlearnedbyrote死记硬背.5Themorewaysyouhavetothinkaboutanideathemoremeaningsitwillhave;themoremeaningfulthelearningisthebetteryoucanrememberit.Payattentiontosimilaritiesinideasandconceptsandthentrytounderstandhowtheyfitinwiththingsyoualreadyknow.Neverbesatisfiedwithanythinglessthanacompletelyclearunderstandingofwhatyouarereading.Ifyouarenotabletofollowthethoughtgobacktotheplacewhereyoufirstgotconfusedandtryagain.A.Studythemiddle.B.Focusonthebeginning.C.Theyshouldbetidyandeasytoread.D.Butreadingisasimportantasreciting.E.Ideasarebestlearnedbyunderstanding.F.Studybeforegoingtobedunlessyouareverytired.G.Itwillalsohelpyoutonoticeyourmistakesandthetopicsyouhavetroubleunderstanding.
15分ABiteofChinaNotripwouldbecompletewithoutexperiencingthelocalfoodculture.1actualChinahasvariouskindsofdeliciousfoodincludingawidevarietyoflocalsnacks.WithoutadoubtforthemajorityoftheforeignersIcontactedandmyself2includePekingDuckDimSumMongolianHotPotwerethefavoriteChinese3dish.Chinaisaplace4thefoodisnotonlydeliciousbutthe5cheapI'veeverfound.6mylastnightinBeijingbeforereturningtotheStatesIwenttoaPekingDuckrestaurantthathadbeensuggestformetotry.WhataBeautifulplace!Splendidwoodblockprintsonthewallsfreshflowersinthevasesonthetableattractivesilverwareandbeautifulchopsticks.Iwashanded7menuand8findmostofthepriceswereespeciallycheapforthehighqualityofthefood.Theduckcameinwholeorhalfalongwithallthelittledecorationsthatyouknowifyou'veevereatenPekingduck﹣alittletortilla玉米饼toputtheslicedduckandvegetablesinchoppedonionsauce.AnywayIendedup9orderawholeduckandthoughtI'djusttaketherestbacktomyhoteltoeatlaterifIcouldn'tfinishit.Unbelievablyintheendtherewas10ofthewholeduckleftontheplate.Ummyummy!
15分Onedayawolfhadabone1stickinhisthroatunexpectedlyand2suffergreatestpain.Heran3anddownaskingeveryanimalhemettoremovethebonefromhimatthesametime4suggestarewardtothesuccessfuloperator.Acrane鹤movedby5promiseventuredherlongneckdownthewolf'sthroatanddrewoutthebone.Shethenaskedforthepromisedreward.Toherquestionthewolfshowinghisteethwith6uglysmilerepliedUngratefulcreature!Youputyourheadintoawolf'smouthandtookitoutin7safe.8dareyouaskformorerewardthanthis Those9areonlyinthehopeofareturnmustnotbesurprisedwhentheycomefacetofacewithbadmen.Whattheymeetwitharemorelaughs10thanks.
1.5分Thea气氛changedassoonasshewalkedin.
在“研究匀变速直线运动的规律”的实验中某同学获得的一条纸带如图所示． 1已知打点计时器电源频率为50Hz则纸带上打相邻两点的时间间隔为． 2ABCDEFG是纸带上7个计数点每两个相邻计数点间有四个点没有画出从图中读出AB两点间距x＝m 3C点对应的速度是m/s小车运动的加速度为m/s2．计算结果保留二位有效数字． 4若实验后发现实际所用交流电的频率高于50hz则上述计算结果与实际值相比是．填“偏大”“偏小”还是“不变”
10分HaveyouconsideredhowyoucanplanaweekendgetawayonabudgetItisthegrowingtrendforhardworkingAmericanstotakeseveralweekendtripsoverthecourseofayearinsteadofonelargeweek﹣longvacation.Thereareavarietyofthingstoseetoanddowithoutspendingalongtimeoralotofmoneydoingit.Sohowcanyouafunandunforgettableweekendgetawaywithabudget1LeavingonThursdayswillallowmuchcheaperpricesonplaneticketshotelroomsrentalcarsandvacationpackages.Avoidtravelingonholidayweekends.PricesareraisedandthingsarebookedearlyandsoldoutonweekendsduringtheholidayssuchasMemorialDayNationalDayThanksgivingandLaborDay.2Considertravelinglastminute.Althoughitmaybehardtoplanespeciallyifchildrenareinvolvedmanyplacessuchashotelsandairlinesoffergreatdiscountedratesforlastminutebookings.3Findcheapthingstodo.Someofthesemayincludenationalorstateparksamusementparksstatefairsandcamping.Saveevenmoremoneybyfindingsomethingnearbywithindrivingdistanceinsteadofflying.Havearelaxingweekendbygettingmuchrest.Don'tcram塞满alotofthingstodointoaweekendtrip.Notonlywillthissavemoneybutitwillofferarefreshingpick﹣upandnotfindthetravelermoretiredafterthetripthanbefore.4Traveltoplacesduringdowntimes.DestinationssuchastheCaribbeanandskiresortsoffermanyfunactivitiesduringthesummerwhichisnotpeaktravelingtime.5A.Bewellpreparedbeforehand.B.Sodon'tplanaholidayweekend.C.Travelingabroadwillincreaseyourtravelcost.D.Travelinglastminutecansaveyousomemoney.E.Priceswillbemuchlowerduringthesetimes.F.StarttheweekendonThursdayinsteadofFridaytosavemoney.G.Spendtheweekendinthewoodsreadinganovelorbaskinginthesun.
7.5分Theanswertoprotectingandsavingmarine海洋wildlifecanstartwithcuttingbackonsomethingAmericansuseeveryday﹣plasticdrinkingstraws.ActorAdrienGrenierbestknownforplayingVincentChaseinthe2015movieEntouragelaunchedacampaigntoreducetheamountofsingle﹣useplasticusageinthiscountryinordertoprotectandsavemarinewildlifeandtheenvironment.Plasticdrinkingstrawsareamongmanymanysingle﹣useplasticproductscontributingtotheshockinglossofmarinelifebutthey'reagreatplacetostartbecausethey'resomethingAmericansareusingbythehundredsofmillionswithoutanyawarenessthatthey'resodamaging. AccordingtoEcocycleaninternationalenvironmentalorganizationAmericansusemorethan500millionstrawsdailywhichareenoughtofill127schoolbuseseachdayandtheycan'tberecycled.That meansplasticstrawsendupinlandfillsoroceanswherefishandothermarinewildlifemistakethesmallbitsforfoodandswallowthem.AfterseeingaphotoofawhalebeachedontheshorewithabellyfullofplasticGrenierfelttheinspirationtolaunchtheLonelyWhaleFoundationhopingtoinspireandeducateothersonthechallengesfacingmarinelife. AlongwithstoppingtheuseofstrawsGrenierhopestoeducateconsumersonthedangersofothersingle﹣useplasticitemssuchasgrocerybagsandwaterbottles.WhilemanyAmericansusetheseplasticproductsintheirdailylifetherearemoresustainablealternativesthatcanhelpprotecttheenvironmentEcocyclerecommendstheuseofstrawsmadefromstainlesssteelglassandevenbambooinsteadofplastic.Youcanbuyanumberoftheseenvironmentallyfriendlystrawsonlineandinstores. 1WhatistheprimarypurposeoftheLonelyWhaleFoundation A.Toadvocateagreenlifestyle. B.TopromoteGrenierslatestmovie. C.Toencouragepeopletoprotectoceanlife. D.Tosavepreciousnaturalresources. 2WhatcausedGreniertostarttheLonelyWhaleFoundation A.Apictureofadeadwhale. B.Plasticstrawsinlandfills. C.Theseveredamagedonetothesea. D.Thedisappearanceofsomespeciesunderthesea. 3Ecocycleadvisespeopletousestrawsthatare. A.easytorecycle B.harmlesstotheenvironment C.specialtomarinelife D.convenienttouse
6分Myson.ThephrasefeltdifficultandstrangethefirsttimeIsaiditandIhadtopracticeitathousandtimes.Istartedsayingthewordstomyselfthedaywhentheultrasound超声波toldmewewerehavingababy. Finallymysonwasborn. Thenursecameoutofthedeliveryroomholdingatinyhowlinghumanbeingwrappedinawhitesheethissmallhandsanddelicatefingersshakingnervously. BabySanchezsheaskedlookingattheroomfullofexpectantfathers. Istoodupholdingmybreath. Sheshowedmemybaby.MysonIwhispered.Thelittleguyscreamedwaaaaaaaaaah. ButinmyheartIheardhimcryoutDaaaaaaad!Idon'tcareifeveryoneintheroomwillsaytheydidn'thearmybabysaythat.IcalledhimMysonandhecalledmeDadandthat'sthat. PeopleaskmeWhatdidIfeelatthatmomentIcan'tevenbegintoanswer.I'mawriteryetItryhardtofindtherightwords.Joyfulisn'tpowerfulenough.Bliss狂喜isnotsweetenough.Peacefulisn'tcalmenough.Happyisn'ttenseenough. AftermysonwastakenawaytothenurseryIsatdownandshutmyeyes.Buttearsescapedthemaway.Thensuddenlymy80﹣year﹣oldfatherenteredandweembraced拥抱. DadIwhispered. Mysonmyheartheardhimsaying. Suddenlythepast33yearsfoldedintothepresentandIwasnowthebabybundledinwhitewithmyfatherstandingoverme. MysonIimaginedhimsaying. Daaaaaaaaaad!Icriedmylittlelungsout. AtthatpointIknewIwasgoingtobeagreatfather.Theoldmaninfrontofmeseemedtoagree.Hesmiledandwewalkedoutoftheroominsearchofthelittlehumanbeingthatwouldchangeourlivesforever. 1Theauthorcouldn'ttellhowhefeltatthemomentbecause. A.hewasawriter B.hewastooexcited C.hewastoonervous D.it'safeelingtoohardtoexpress 2WecanlearnthefollowingfromthepassageEXCEPTthat. A.theauthorgothisfirstbaby B.heprobablyhadalungdisease C.theauthordidn'treallyhearDaaaaadfromhisbaby D.thebabywouldchangetheauthor'slife 3Whywasthewritersurehewasgoingtobeagreatfather A.Becausehissonissogifted. B.Becausehehadmuchexperienceinbringingupchildren. C.Becausehisfatherpromisedtohelphim. D.Becausehisfatherhadalreadysethimagoodexample.
30分IwasshoppinginasupermarketlastnightwhenIsawahomelesswomanwithatrolley手推车fullofallherthings.Shewassittinginsidetokeep1.Iwentuptoherandtriedtogiveher2forsomethingtoeat.Shewouldn't3it.IsaidIwantedtohelpher4shesaidthatifenoughmoneywasgiventoherthatdayandshehadmoneyonherotherhomelesspeoplewould5itfromherwhilesheslept. I6thatIwantedtohelpherandaskedifIcouldbuyhersomethingwarm.7shesaidno.Shethankedmeandsaidhow8shewasthatIhadspokentoherandoffered9.WeintroducedourselvesandshesaidthatwhenIsawherthenexttimeshewould10accepthelp. Iwalkedoutintothecoldwinter11andgavethemoneytoahomelessmanwhowasfreezing.Iaskedhimhisname12IalwayswanttoknowandItoldhimmine.HappearedtohavehadadrinkingordrugproblembutIwas13thatheacceptedmyhelp. Ihadthis14thatstayedwithme.IfeltthatIhadbeeninthepresenceofsomeonereallyspecialearlier.Ialways15whatitwouldbeliketobeinahomelessperson'sshoesIknowhow16IamandhowgratefulIamforwhatI17inmylife. Ilearnedavaluable18fromtheladyImet:Notall19peoplewilltakemoneyorhelpiftheyfeelenoughhasbeengiventothemthatday.Shewasgratefulfortheday.IwillmakesureI20heragain. 1Acalm B.warm C.healthy D.energetic 2A.time B.freedom C.money D.choice 3A.take B.make C.eat D.receive 4A.and B.or C.so D.but 5A.spend B.steal C.find D.hide 6A.agreed B.wondered C.apologized D.explained 7A.Again B.Besides C.Instead D.Thus 8A.proud B.curious C.regretful D.grateful 9A.help B.food C.strength D.advice 10A.generously B.willingly C.slightly D.politely 11A.morning B.noon C.afternoon D.night 12A.unless B.when C.because D.though 13A.glad B.sure C.astonished D.puzzled 14A.hope B.feeling C.belief D.courage 15A.expect B.believe C.imagine D.remember 16A.lucky B.unique C.serious D.confident 17A.observe B.own C.support D.respect 18A.fact B.quality C.lesson D.subject 19A.lonely B.hungry C.helpless D.homeless 20A.call B.ask C.meet D.follow
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