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在允许加热的条件下，只用一种试剂就可以鉴别硫酸铵、氯化钾、氯化镁、硫酸铝和硫酸铁溶液，这种试剂是( )。
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在允许加热的条件下只用一种试剂就可以鉴别NH42SO4KClMgCl2Al2SO43和Fe2SO43
NaOH
NH
3
·H
2
O
AgNO
3
BaCl
2
在允许加热的条件下只用一种试剂就可以鉴别硫酸铵氯化钾氯化镁硫酸铝和硫酸铁溶液这种试剂是
NaOH
NH
3
•H
2
O
AgNO
3
KSCN
现有①氯化钾②硫酸镁③氢氧化钾④氯化铜四种溶液不用其他试剂仅用观察法和相互反应就可以区别开则鉴别开的
③②①④
④③②①
④②③①
②①③④
现有硫酸钠氯化铵氯化钠硫酸铵四种无色溶液只用一种试剂且各取一次将它们鉴别开来可加热这种试剂是
盐酸
碳酸钠溶液
氢氧化钡溶液
氢氧化钠溶液
在允许加热的条件下只用一种试剂就可以鉴别硫酸铵氯化钾氯化镁硫酸铝和硫酸铁溶液这种试剂是
NaOH
NH
3
·H
2
O
AgNO
3
BaCl
2
不可以在葡萄马铃薯茶树甜菜等忌氯作物上施用的肥料是
硫酸钾
氯化钾
氯化铵
硫酸铵
下列各组物质只用一种试剂括号内物质及相互之间的反应不能鉴别开来的是
固体：食盐、硝酸铵、烧碱（水）
固体：硫酸铜、熟石灰、碳酸钙（稀盐酸）
溶液：纯碱、食盐、盐酸（酚酞试液）
溶液：氯化钠、氯化钾、硫酸钾（硝酸银溶液）
下列鉴别物质所使用的试剂或方法正确的是
CO和CO
2
—— 看颜色，闻气味
氧气和氮气 —— 燃着的木条
硫酸铵和氯化钾 —— 加水看溶解性
稀硫酸和氯化钠溶液 ——酚酞溶液
下列各组溶液不用其它试剂就可以将它们区别开的是
盐酸、氯化钾、硫酸钾、碳酸钾
氢氧化钾、碳酸钾、硫酸镁、硫酸氢钾
氯化钡、硝酸钡、硫酸钠、硝酸钾
硝酸钠、盐酸、氯化铵、氢氧化钾
在允许加热的条件下只用一种试剂就可以鉴别硫酸铵氯化钾氯化镁硫酸铝和硫酸铁溶液这种试剂是
AgNO
3
BaCl
2
NaOH
氨水
在允许加热的条件下只用一种试剂就可以鉴别NH42SO4KClMgCl2Al2SO43和Fe2SO43
NaOH
NH
3
·H
2
O
AgNO
3
BaCl
2
允许加热的条件下只用一种试剂就可以鉴别硫酸铵氯化钾氯化镁硫酸铝和硫酸铁溶液下列溶液中可选用的是
NH
3
•H
2
O
NaOH
AgNO
3
BaCl
2
有一包化学肥料可能是硫酸铵碳酸氢铵过磷酸钙氯化钾中的一种取少量样品观察到其外观为白色晶体加水后能全部
氯化钾
碳酸氢铵
硫酸铵
过磷酸钙
为鉴别硫酸钾氢氧化钡盐酸氯化钾氢氧化钾五种无色溶液先加入一种试剂鉴别出一种物质并把未鉴别出的物质分
有一包化学肥料可能是硫酸铵碳酸氢铵硝酸铵氯化钾中的一种．取少量样品与熟石灰混合研磨没有刺激性气体放
氯化钾
碳酸氢铵
硫酸铵
硝酸铵
在允许加热的条件下只用一种试剂就可以鉴别硫酸铵氯化钾氯化镁硫酸铝和硫酸铁溶液这种试剂是
NaOH
NH
3
・H
2
O
AgNO
3
BaCl
2
只用一种试剂就可以鉴别氢氧化钠溶液氢氧化钙溶液稀硫酸这种试剂是
石蕊试液
酚酞试液
碳酸钠溶液
氯化铵溶液
只用一种试剂就可以鉴别氯化钾氯化镁硫酸铝和硫酸铁溶液这种试剂是
NaCl
HCl
NH
3
·H
2
O
NaOH
只用一种试剂就可一次性鉴别稀硫酸氢氧化钾溶液氯化钙溶液的是
氯化钾溶液
碳酸钾溶液
稀盐酸
硝酸钠溶液
在允许加热的条件下只用一种试剂就可以鉴别硫酸铵氯化钾氯化镁和硫酸铁溶液这种试剂是
NaOH
Na
2
CO
3
AgNO
3
BaCl
2
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Fromchildhoodtooldagewealluselanguageasameansofbroadeningourknowledgeofourselvesandtheworldaboutus.Whenhumansfirst16theywerelikenewbornchildrenunabletousethis17tool.Yetoncelanguagedevelopedthepossibilitiesforhumankind’sfuture18andculturalgrowthincreased.Manylinguistsbelievethatevolutionis19forourabilitytoproduceanduselanguage.They20thatourhighlyevolvedbrainprovidesus21aninnatelanguageabilitynotfoundinlower22.Proponentsofthisinnatenesstheorysaythatour23forlanguageisinbornbutthatlanguageitselfdevelopsgradually24afunctionofthegrowthofthebrainduringchildhood.Thereforetherearecritical25timesforlanguagedevelopment.Current26oftheinnatenesstheoryaremixed;howeverevidencesupportingtheexistenceofsomeinnateabilitiesisundeniable.27moreandmoreschoolsarediscoveringthatforeignlanguagesarebesttaughtin28grades.Youngchildrenoftencanlearnseverallanguagesbybeing29tothemwhileadultshaveamuchhardertimelearninganotherlanguageoncethe30oftheirfirstlanguagehavebecomefirmlyfixed.31someaspectsoflanguageareundeniablyinnatelanguagedoesnotdevelopautomaticallyinavacuum.Childrenwhohavebeen32fromotherhumanbeingsdonotpossesslanguage.Thisdemonstratesthat33withotherhumanbeingsisnecessaryforproperlanguagedevelopment.Somelinguistsbelievethatthisisevenmorebasictohumanlanguage34thananyinnatecapacities.Thesetheoristsviewlanguageasimitativelearnedbehavior.35childrenlearnlanguagefromtheirparentsbyimitatingthem.Parentsgraduallyshapetheirchild’slanguageskillsbypositivelyreinforcingpreciseimitationsandnegativelyreinforcingimpreciseones.Ⅱ．完形填空/Cloze阅读下列短文掌握其大意然后从每小题所给的四个选项ABCD中选出最佳选项
Fromchildhoodtooldagewealluselanguageasameansofbroadeningourknowledgeofourselvesandtheworldaboutus.Whenhumansfirst16theywerelikenewbornchildrenunabletousethis17tool.Yetoncelanguagedevelopedthepossibilitiesforhumankind’sfuture18andculturalgrowthincreased.Manylinguistsbelievethatevolutionis19forourabilitytoproduceanduselanguage.They20thatourhighlyevolvedbrainprovidesus21aninnatelanguageabilitynotfoundinlower22.Proponentsofthisinnatenesstheorysaythatour23forlanguageisinbornbutthatlanguageitselfdevelopsgradually24afunctionofthegrowthofthebrainduringchildhood.Thereforetherearecritical25timesforlanguagedevelopment.Current26oftheinnatenesstheoryaremixed;howeverevidencesupportingtheexistenceofsomeinnateabilitiesisundeniable.27moreandmoreschoolsarediscoveringthatforeignlanguagesarebesttaughtin28grades.Youngchildrenoftencanlearnseverallanguagesbybeing29tothemwhileadultshaveamuchhardertimelearninganotherlanguageoncethe30oftheirfirstlanguagehavebecomefirmlyfixed.31someaspectsoflanguageareundeniablyinnatelanguagedoesnotdevelopautomaticallyinavacuum.Childrenwhohavebeen32fromotherhumanbeingsdonotpossesslanguage.Thisdemonstratesthat33withotherhumanbeingsisnecessaryforproperlanguagedevelopment.Somelinguistsbelievethatthisisevenmorebasictohumanlanguage34thananyinnatecapacities.Thesetheoristsviewlanguageasimitativelearnedbehavior.35childrenlearnlanguagefromtheirparentsbyimitatingthem.Parentsgraduallyshapetheirchild’slanguageskillsbypositivelyreinforcingpreciseimitationsandnegativelyreinforcingimpreciseones.Ⅱ．完形填空/Cloze阅读下列短文掌握其大意然后从每小题所给的四个选项ABCD中选出最佳选项
Amiddle-agedmanwithalongbeardwasarrestedbythepolicefordisorderlyconductandpropertydamage.Morechargesmightheaddedlatersaidapoliceofficer.ThemanidentifiedasBillWildcheckedintotheMotelFivelastnightaboutanhouraftersunset.Tellingtheclerkthathewouldbestayingfournightshepaidcashinadvance.ShesaidthatthenearestgrocerystorewasJohn-Johnswhichwasonlytwoblocksaway.ThepolicesaidthatWildwenttoJohn-Johnsandpurchasedthreegallonsofhoneyandfourgallonsofchocolatesyrup糖浆.Thecheckeraskedhimwhattheoccasionwas.HerepliedI’mtryingtobecomeasweeterperson.Thecheckersmiledatthejoke.Wilddrovebacktothemotel.Heopenedallsevencontainersandpouredthemintothebathtub.Headdedwarmwatertothemix.Thenheplacedhisboomboxonthebathroomfloornexttothetub.Hetunedtheradiotoanoperastation.Hegotundressedhoppedintothetubandstartedsingingloudlywiththemusic.Fifteenminuteslaterthelodgersintheroomnextdoorphonedtheclerk.ShebangedonWild’sdoorbuthekeptsinging.Shephonedhisroombuthedidn’tanswer.Thenshecalledthepolicewhoarrivedquickly.Wellatleasthepaidinadvancesaidtheclerk.Thatmoneywillhelppayfortheplumber管子工.Thebathtubdrainwascompletelyclogged阻塞.Thetubremainedfullofchocolateandhoney.Youjustneverknowaboutpeoplesaidtheclerk.Heseemedsoniceandfriendly.Who’dhavethoughthewasabathtub-singingnutThepolicesaidthiswasthethirdtimethatWildhadbeenarrestedforthiskindofbehavior.WhatdoyouthinkofBillWildWhyPleaseanswerwithin30words
______withyouIdon'tlikeplayingfootball.
Amiddle-agedmanwithalongbeardwasarrestedbythepolicefordisorderlyconductandpropertydamage.Morechargesmightheaddedlatersaidapoliceofficer.ThemanidentifiedasBillWildcheckedintotheMotelFivelastnightaboutanhouraftersunset.Tellingtheclerkthathewouldbestayingfournightshepaidcashinadvance.ShesaidthatthenearestgrocerystorewasJohn-Johnswhichwasonlytwoblocksaway.ThepolicesaidthatWildwenttoJohn-Johnsandpurchasedthreegallonsofhoneyandfourgallonsofchocolatesyrup糖浆.Thecheckeraskedhimwhattheoccasionwas.HerepliedI’mtryingtobecomeasweeterperson.Thecheckersmiledatthejoke.Wilddrovebacktothemotel.Heopenedallsevencontainersandpouredthemintothebathtub.Headdedwarmwatertothemix.Thenheplacedhisboomboxonthebathroomfloornexttothetub.Hetunedtheradiotoanoperastation.Hegotundressedhoppedintothetubandstartedsingingloudlywiththemusic.Fifteenminuteslaterthelodgersintheroomnextdoorphonedtheclerk.ShebangedonWild’sdoorbuthekeptsinging.Shephonedhisroombuthedidn’tanswer.Thenshecalledthepolicewhoarrivedquickly.Wellatleasthepaidinadvancesaidtheclerk.Thatmoneywillhelppayfortheplumber管子工.Thebathtubdrainwascompletelyclogged阻塞.Thetubremainedfullofchocolateandhoney.Youjustneverknowaboutpeoplesaidtheclerk.Heseemedsoniceandfriendly.Who’dhavethoughthewasabathtub-singingnutThepolicesaidthiswasthethirdtimethatWildhadbeenarrestedforthiskindofbehavior.WhichsentenceinthepassagecanbereplacedbythefollowingoneHelookssokindandamicablethatwehadneverthoughthewasamadmanwholikestosinginbathtub.
Howshouldoneinvestasumofmoneyinthesedaysofinflation通货膨胀Leftinabankitwillhardlykeepitsvaluehoweverhightheinterestrateis.OnlyabravemanoraveryrichonedarestobuyandsellontheStockMarket.Todayitseemsthatoneofthebestwaystoprotectyoursavingsandevenincreaseyourwealthistobuybeautifulobjectsfromthepast.HereIamgoingtooffersomeadviceoncollectingantiqueclockswhichIpersonallyconsiderareamongthemostinterestingofantiques.Isometimeswonderwhatabeingfromanotherplanetmightreportbackaboutourwayoflife.TheplanetEarthisruledbyamysteriouscreaturethatsitsorstandsinaroomandmakesastrangetickingsound.Ithasafacewithtwelveblackmarksandtwohands.Mencandonothingwithoutitspermissionanditfastensitsyoungroundpeople’swristssothateverywheremengotheyarestillunderitscontrol.ThiscreatureistherealmasterofEarthandmenareitsslaves.Whetherornotweareslavesoftimetodaydependsonourcultureandpersonalitybutitisbelievedthatmanyyearsagokingskeptspecialslavestotellthetime.Certainmenwereverycleveratmeasuringthetimeofdayaccordingtothebeatingoftheirownhearts.Theyweremadetostandinafixedplaceandeveryhourorsowouldshoutthetime.Soitseemsthatthefirstclockswerehumanbeings.Howevermenquicklyfoundmoreconvenientandreliablewaysoftellingthetime.Theylearnedtousetheshadowscastbythesun.Theymarkedthehoursoncandlesusedsandinhourglassesandinventedwater-clocks.Indeedanyseriousstudentofantiquesshouldspendasmuchtimeaspossiblevisitingpalacesstatelyhomesandmuseumstoseesomeofthefinestexamplesofclocksfromthepast.Antiqueclockscouldbeveryexpensivebutoneofthejoysofcollectingclocksisthatitisstillpossibletofindquitecheaponesforyourownhome.AfterallifyouaregoingtoberuledbythetimewhynotinvestinairantiqueclockandperhapsmakeafutureprofitAccordingtothepassagecollectingantiqueclocks______.
Fromthehealthpointofviewwearelivinginamarvelousage.Weareimmunizedfrombirthagainstmanyofthemostdangerousdiseases.Alargenumberofoncefatalillnessescannowbecuredbymoderndrugsandsurgery.Itisalmostcertainthatonedayremedieswillbefoundforthemoststubbornremainingdiseases.Theexpectationoflifehasincreasedenormously.Butthoughthepossibilityoflivingalongandhappylifeisgreaterthaneverbeforeeverydaywewitnesstheincredibleslaughterofmenwomenandchildrenontheroads.Manversusthemotorcar!Itisanever-endingbattlewhichmanislosing.Thousandsofpeopleovertheworldarekilledorhorriblykilledeachyearandwearequietlysittingbackandlettingithappen.Ithasbeenrightlysaidthatwhenamanissittingbehindasteeringwheelhiscarbecomestheextensionofhispersonality.Thereisnodoubtthatthemotorcaroftenbringsoutaman’sveryworstqualities.Peoplewhoarenormallyquietandpleasantmaybecomeunrecognizablewhentheyarebehindasteering-wheel.Theysweartheyareill-manneredandaggressivewillfulastwo-year-oldsandutterlyselfish.Alltheirhiddenfrustrationsdisappointmentsandjealousiesseemtobebroughttothesurfacebytheactofdriving.Thesurprisingthingisthatsocietysmilessobenignlyonthemotoristandseemstocondonehisbehaviour.Everythingisdoneforhisconvenience.Citiesareallowedtobecomealmostuninhabitablebecauseofheavytraffic;townsaremadeuglybyhugecarparks;thecountrysideisdesecratedbyroadnetworks;andthemassannualslaughterbecomesnothingmorethanastatistictobeconvenientlyforgotten.Itishightimeaworldcodewerecreatedtoreducethissenselesswasteofhumanlife.Withregardtodrivingthelawsofsomecountriesarenotoriouslylaxandeventhestrictestarenotstrict:enough.Acodewhichwasuniversallyacceptedcouldonlyhaveadramaticallybeneficialeffectontheaccidentrate.Hereareafewexamplesofsomeofthethingsthatmightbedone.Thedrivingtestshouldbestandardizedandmadefarmoredifficultthanitis;allthedriversshouldbemadetotakeatesteverythreeyearsorso;theageatwhichyoungpeopleareallowedtodriveanyvehicleshouldheraisedtoatleast21;allvehiclesshouldbeputthroughstringentannualtestsforsafety.Eventhesmallestamountofalcoholinthebloodcanimpairaperson’sdrivingability.Presentdrinkinganddrivinglawswheretheyexistshouldhemadmuchstricter.Maximumandminimumspeedlimitsshouldbeimposedonallroads.GovernmentsshouldlaydownsafetyspecificationsformanufacturersashasbeendoneintheUSA.Alladvertisingstressingpowerandperformanceshouldbebanned.Thesemeasuresmaysoundinordinatelyharsh.Butsurelynothingshouldbeconsideredassevereifitresultsinreducingtheannualtollofhumanlife.Afteralltheworldisforhumanbeingsnotmotorcars.WhichofthefollowingisNOTmentionedasawayagainsttrafficaccidents
Thereason______hegaveforbeinglatewas______heoversleptthismorning.
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemsthatfouroutoffiveyoungpeoplenowgetonwiththeirparentswhichistheoppositeofthepopularly-heldimage形象ofunhappyteenagerslockedintheirroomafterendlessfamilyquarrels.Animportantnewstudyintoteenageattitudessurprisinglyshowsthattheirfamilylifeismoreharmoniousthanithaseverbeeninthepast.Weweresurprisedbyjusthowpositivetoday’syoungpeopleseemtobeabouttheirfamiliessaidonememberoftheresearchteamThey’reexpectedtoberebellious叛逆的andselfishbutactuallytheyhaveotherthingsontheirminds:theywantacarandmaterialgoodsandtheyworryaboutwhetherschoolisservingthemwell.There’smorenegotiation商议anddiscussionbetweenparentsandchildrenandchildrenexpecttotakepartinthefamilydecision-makingprocess.Theydon’twanttorocktheboat.Soitseemsthatthisgenerationofparentsismuchmorelikelythanparentsof30yearsagototreattheirchildrenasfriends.Myparentsarehappytodiscussthingswithmeandwillingtolistentomesays17-year-oldDanielLazallIalwaystellthemwhenI’mgoingoutclubbing.AslongastheyknowwhatI’mdoingthey’refinewithit.SusanCromewhoisnow21agrees.Lookingbackonthelast10yearstherewasalotofwhatyoucouldcallnegotiation.ForexampleaslongasI’ddoneallmyhomeworkIcouldgooutonaSaturdaynight.ButIthinkmygrandparentswerealotstricterwithmyparentsthanthat.Maybethispositiveviewoffamilylifeshouldnotbeunexpected.Itispossiblethattheideaofteenagerebellionisnotrootedinrealfacts.AresearchercommentsOursurprisethatteenagerssaytheygetalongwellwiththeirparentscomesbecauseofabriefperiodinoursocialhistorywhenteenagerswereregardedasdifferentbeings.Butthatideaofrebellingandbreakingawayfromtheirparentsreallyonlyhappenedduringthatonetimeinthe1960swheneveryonerebelled.Thenormalsituationthroughouthistoryhasbeenasmoothchangefromhelpingoutwiththefamilybusinesstotakingitover./Comparedwithparentsof30yearsagotoday’sparents______.
IamSergeyBrin!IwasborninMoscow.In1979whenIwas5myfamilyimmigratedtotheU.S.A.California.Irememberthatonmy9thbirthdayIgotmyfirstcomputerCommodore64.LaterIgraduatedwithhonorsintheUniversityofMarylandinMathematicsandIT.Themainfieldofmyscienceresearchwasthetechnologiesusedtocollectdatafromunsystematicsourcesaswellaslargequantitiesoftextsandsciencedata.IwastheauthorofdozensofarticlesinleadingAmericanacademicmagazines.Thegreatesteventinmylifehappenedwhenin1998Iwaspreparingforthedefense论文答辩ofmyDoctor’sdegreeinStanfordUniversity.TherethefatemadememeetLarryPage—ayoungcomputergenius.Larrybelongedtotheintellectual知识分子society.LarryandIquicklybecamefriendswhenweworkedtogether.WeweresearchingdayandnightontheInternet.Wewerefindingalotofinformationbutwiththefeelingwestillcouldn’tfindenoughofwhatwewerelookingfor.Naturallytheideaforasearchenginethatwouldallowspecificinformationtobefoundintheendlesspoolofdatawasbornlikeitcametous.Itwasn’tourplansbutwegaveuptheeducationattheuniversity.Youknowthenextpartmaybe—wemanagedtoturnanordinarygarageinMeploParkCaliforniatheU.S.A.intoourfirstofficeinwhichGooglewasborn.WithexcitementwetypedthenameofthethingwhichwecreatedwithloveonSeptember14th1998—www.Google.com.Nowafterthoseyearsweboughtthisgarage.Asasymbolitwillalwaysremindusthateverythingispossible.SergeyBrinactuallygraduatedfrom______.
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemsthatfouroutoffiveyoungpeoplenowgetonwiththeirparentswhichistheoppositeofthepopularly-heldimage形象ofunhappyteenagerslockedintheirroomafterendlessfamilyquarrels.Animportantnewstudyintoteenageattitudessurprisinglyshowsthattheirfamilylifeismoreharmoniousthanithaseverbeeninthepast.Weweresurprisedbyjusthowpositivetoday’syoungpeopleseemtobeabouttheirfamiliessaidonememberoftheresearchteamThey’reexpectedtoberebellious叛逆的andselfishbutactuallytheyhaveotherthingsontheirminds:theywantacarandmaterialgoodsandtheyworryaboutwhetherschoolisservingthemwell.There’smorenegotiation商议anddiscussionbetweenparentsandchildrenandchildrenexpecttotakepartinthefamilydecision-makingprocess.Theydon’twanttorocktheboat.Soitseemsthatthisgenerationofparentsismuchmorelikelythanparentsof30yearsagototreattheirchildrenasfriends.Myparentsarehappytodiscussthingswithmeandwillingtolistentomesays17-year-oldDanielLazallIalwaystellthemwhenI’mgoingoutclubbing.AslongastheyknowwhatI’mdoingthey’refinewithit.SusanCromewhoisnow21agrees.Lookingbackonthelast10yearstherewasalotofwhatyoucouldcallnegotiation.ForexampleaslongasI’ddoneallmyhomeworkIcouldgooutonaSaturdaynight.ButIthinkmygrandparentswerealotstricterwithmyparentsthanthat.Maybethispositiveviewoffamilylifeshouldnotbeunexpected.Itispossiblethattheideaofteenagerebellionisnotrootedinrealfacts.AresearchercommentsOursurprisethatteenagerssaytheygetalongwellwiththeirparentscomesbecauseofabriefperiodinoursocialhistorywhenteenagerswereregardedasdifferentbeings.Butthatideaofrebellingandbreakingawayfromtheirparentsreallyonlyhappenedduringthatonetimeinthe1960swheneveryonerebelled.Thenormalsituationthroughouthistoryhasbeenasmoothchangefromhelpingoutwiththefamilybusinesstotakingitover./Whatisthepopularimageofteenagerstoday
When______helponeoftensaysThankyouorIt'skindofyou.
Fromchildhoodtooldagewealluselanguageasameansofbroadeningourknowledgeofourselvesandtheworldaboutus.Whenhumansfirst16theywerelikenewbornchildrenunabletousethis17tool.Yetoncelanguagedevelopedthepossibilitiesforhumankind’sfuture18andculturalgrowthincreased.Manylinguistsbelievethatevolutionis19forourabilitytoproduceanduselanguage.They20thatourhighlyevolvedbrainprovidesus21aninnatelanguageabilitynotfoundinlower22.Proponentsofthisinnatenesstheorysaythatour23forlanguageisinbornbutthatlanguageitselfdevelopsgradually24afunctionofthegrowthofthebrainduringchildhood.Thereforetherearecritical25timesforlanguagedevelopment.Current26oftheinnatenesstheoryaremixed;howeverevidencesupportingtheexistenceofsomeinnateabilitiesisundeniable.27moreandmoreschoolsarediscoveringthatforeignlanguagesarebesttaughtin28grades.Youngchildrenoftencanlearnseverallanguagesbybeing29tothemwhileadultshaveamuchhardertimelearninganotherlanguageoncethe30oftheirfirstlanguagehavebecomefirmlyfixed.31someaspectsoflanguageareundeniablyinnatelanguagedoesnotdevelopautomaticallyinavacuum.Childrenwhohavebeen32fromotherhumanbeingsdonotpossesslanguage.Thisdemonstratesthat33withotherhumanbeingsisnecessaryforproperlanguagedevelopment.Somelinguistsbelievethatthisisevenmorebasictohumanlanguage34thananyinnatecapacities.Thesetheoristsviewlanguageasimitativelearnedbehavior.35childrenlearnlanguagefromtheirparentsbyimitatingthem.Parentsgraduallyshapetheirchild’slanguageskillsbypositivelyreinforcingpreciseimitationsandnegativelyreinforcingimpreciseones.Ⅱ．完形填空/Cloze阅读下列短文掌握其大意然后从每小题所给的四个选项ABCD中选出最佳选项
IamSergeyBrin!IwasborninMoscow.In1979whenIwas5myfamilyimmigratedtotheU.S.A.California.Irememberthatonmy9thbirthdayIgotmyfirstcomputerCommodore64.LaterIgraduatedwithhonorsintheUniversityofMarylandinMathematicsandIT.Themainfieldofmyscienceresearchwasthetechnologiesusedtocollectdatafromunsystematicsourcesaswellaslargequantitiesoftextsandsciencedata.IwastheauthorofdozensofarticlesinleadingAmericanacademicmagazines.Thegreatesteventinmylifehappenedwhenin1998Iwaspreparingforthedefense论文答辩ofmyDoctor’sdegreeinStanfordUniversity.TherethefatemadememeetLarryPage—ayoungcomputergenius.Larrybelongedtotheintellectual知识分子society.LarryandIquicklybecamefriendswhenweworkedtogether.WeweresearchingdayandnightontheInternet.Wewerefindingalotofinformationbutwiththefeelingwestillcouldn’tfindenoughofwhatwewerelookingfor.Naturallytheideaforasearchenginethatwouldallowspecificinformationtobefoundintheendlesspoolofdatawasbornlikeitcametous.Itwasn’tourplansbutwegaveuptheeducationattheuniversity.Youknowthenextpartmaybe—wemanagedtoturnanordinarygarageinMeploParkCaliforniatheU.S.A.intoourfirstofficeinwhichGooglewasborn.WithexcitementwetypedthenameofthethingwhichwecreatedwithloveonSeptember14th1998—www.Google.com.Nowafterthoseyearsweboughtthisgarage.Asasymbolitwillalwaysremindusthateverythingispossible.WhydidtheyfoundGoogle
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemsthatfouroutoffiveyoungpeoplenowgetonwiththeirparentswhichistheoppositeofthepopularly-heldimage形象ofunhappyteenagerslockedintheirroomafterendlessfamilyquarrels.Animportantnewstudyintoteenageattitudessurprisinglyshowsthattheirfamilylifeismoreharmoniousthanithaseverbeeninthepast.Weweresurprisedbyjusthowpositivetoday’syoungpeopleseemtobeabouttheirfamiliessaidonememberoftheresearchteamThey’reexpectedtoberebellious叛逆的andselfishbutactuallytheyhaveotherthingsontheirminds:theywantacarandmaterialgoodsandtheyworryaboutwhetherschoolisservingthemwell.There’smorenegotiation商议anddiscussionbetweenparentsandchildrenandchildrenexpecttotakepartinthefamilydecision-makingprocess.Theydon’twanttorocktheboat.Soitseemsthatthisgenerationofparentsismuchmorelikelythanparentsof30yearsagototreattheirchildrenasfriends.Myparentsarehappytodiscussthingswithmeandwillingtolistentomesays17-year-oldDanielLazallIalwaystellthemwhenI’mgoingoutclubbing.AslongastheyknowwhatI’mdoingthey’refinewithit.SusanCromewhoisnow21agrees.Lookingbackonthelast10yearstherewasalotofwhatyoucouldcallnegotiation.ForexampleaslongasI’ddoneallmyhomeworkIcouldgooutonaSaturdaynight.ButIthinkmygrandparentswerealotstricterwithmyparentsthanthat.Maybethispositiveviewoffamilylifeshouldnotbeunexpected.Itispossiblethattheideaofteenagerebellionisnotrootedinrealfacts.AresearchercommentsOursurprisethatteenagerssaytheygetalongwellwiththeirparentscomesbecauseofabriefperiodinoursocialhistorywhenteenagerswereregardedasdifferentbeings.Butthatideaofrebellingandbreakingawayfromtheirparentsreallyonlyhappenedduringthatonetimeinthe1960swheneveryonerebelled.Thenormalsituationthroughouthistoryhasbeenasmoothchangefromhelpingoutwiththefamilybusinesstotakingitover./Whatisthepassagemainlyabout
Howshouldoneinvestasumofmoneyinthesedaysofinflation通货膨胀Leftinabankitwillhardlykeepitsvaluehoweverhightheinterestrateis.OnlyabravemanoraveryrichonedarestobuyandsellontheStockMarket.Todayitseemsthatoneofthebestwaystoprotectyoursavingsandevenincreaseyourwealthistobuybeautifulobjectsfromthepast.HereIamgoingtooffersomeadviceoncollectingantiqueclockswhichIpersonallyconsiderareamongthemostinterestingofantiques.Isometimeswonderwhatabeingfromanotherplanetmightreportbackaboutourwayoflife.TheplanetEarthisruledbyamysteriouscreaturethatsitsorstandsinaroomandmakesastrangetickingsound.Ithasafacewithtwelveblackmarksandtwohands.Mencandonothingwithoutitspermissionanditfastensitsyoungroundpeople’swristssothateverywheremengotheyarestillunderitscontrol.ThiscreatureistherealmasterofEarthandmenareitsslaves.Whetherornotweareslavesoftimetodaydependsonourcultureandpersonalitybutitisbelievedthatmanyyearsagokingskeptspecialslavestotellthetime.Certainmenwereverycleveratmeasuringthetimeofdayaccordingtothebeatingoftheirownhearts.Theyweremadetostandinafixedplaceandeveryhourorsowouldshoutthetime.Soitseemsthatthefirstclockswerehumanbeings.Howevermenquicklyfoundmoreconvenientandreliablewaysoftellingthetime.Theylearnedtousetheshadowscastbythesun.Theymarkedthehoursoncandlesusedsandinhourglassesandinventedwater-clocks.Indeedanyseriousstudentofantiquesshouldspendasmuchtimeaspossiblevisitingpalacesstatelyhomesandmuseumstoseesomeofthefinestexamplesofclocksfromthepast.Antiqueclockscouldbeveryexpensivebutoneofthejoysofcollectingclocksisthatitisstillpossibletofindquitecheaponesforyourownhome.AfterallifyouaregoingtoberuledbythetimewhynotinvestinairantiqueclockandperhapsmakeafutureprofitWhichofthefollowingisNOTmentionedasawaytomeasurethetime
Fromchildhoodtooldagewealluselanguageasameansofbroadeningourknowledgeofourselvesandtheworldaboutus.Whenhumansfirst16theywerelikenewbornchildrenunabletousethis17tool.Yetoncelanguagedevelopedthepossibilitiesforhumankind’sfuture18andculturalgrowthincreased.Manylinguistsbelievethatevolutionis19forourabilitytoproduceanduselanguage.They20thatourhighlyevolvedbrainprovidesus21aninnatelanguageabilitynotfoundinlower22.Proponentsofthisinnatenesstheorysaythatour23forlanguageisinbornbutthatlanguageitselfdevelopsgradually24afunctionofthegrowthofthebrainduringchildhood.Thereforetherearecritical25timesforlanguagedevelopment.Current26oftheinnatenesstheoryaremixed;howeverevidencesupportingtheexistenceofsomeinnateabilitiesisundeniable.27moreandmoreschoolsarediscoveringthatforeignlanguagesarebesttaughtin28grades.Youngchildrenoftencanlearnseverallanguagesbybeing29tothemwhileadultshaveamuchhardertimelearninganotherlanguageoncethe30oftheirfirstlanguagehavebecomefirmlyfixed.31someaspectsoflanguageareundeniablyinnatelanguagedoesnotdevelopautomaticallyinavacuum.Childrenwhohavebeen32fromotherhumanbeingsdonotpossesslanguage.Thisdemonstratesthat33withotherhumanbeingsisnecessaryforproperlanguagedevelopment.Somelinguistsbelievethatthisisevenmorebasictohumanlanguage34thananyinnatecapacities.Thesetheoristsviewlanguageasimitativelearnedbehavior.35childrenlearnlanguagefromtheirparentsbyimitatingthem.Parentsgraduallyshapetheirchild’slanguageskillsbypositivelyreinforcingpreciseimitationsandnegativelyreinforcingimpreciseones.Ⅱ．完形填空/Cloze阅读下列短文掌握其大意然后从每小题所给的四个选项ABCD中选出最佳选项
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