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四面体的四个表面三角形中，直角三角形最多有______
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在正方体上任意选择 4 个顶点它们可能是下列某些几何形状的 4 个顶点 ①矩形 ②不是矩形的平行四
从正方体的八个顶点中任意选择4个顶点它们可能是如下几种几何体或平面图形的4个顶点这些几何体或平面图形
某四面体的三视图如图所示则该四面体的四个面中直角三角形的面积和是_______.
2017年·上海中学模拟8如果一个四面体的三个面是直角三角形下列三角形1直角三角形2锐角三角形3钝
在正方体上任意选择4个顶点它们可能是如下各种几何形体的4个顶点这些几何形体是写出所有正确结论的编号.
四面体的三视图如图所示三个三角形均为直角三角形则该四面体的外接球表面积是______________
把一个正四面体的每个表面都分成9个相同的等边三角形用任意颜色给这些小三角形上色要求有公共边的小三角形
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把一个正四面体的每个表面都分成9个相同的等边三角形用任意颜色给这些小三角形上色要求有公共边的小三角形
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把一个正四面体的每个表面都分成9个相同的等边三角形用任意颜色给这些小三角形上色要求有公共边的小三角形
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在正方体上任意选择4个顶点作为以下几何体的 4 个顶点①矩形②不是矩形的平行四边形③有三个面为等腰直
在底面为正方形的长方体上任意选择 4 个顶点它们可能是如下各种几何形体的 4 个顶点 ①矩形 ②不
①②④⑤
①②③⑤
①②③④
①③④⑤
在正方体上任意选择4个顶点作为如下五种几何形体的4个顶点①矩形②不是矩形的平行四边形③有三个面为等腰
已知一几何体的三视图如图所示正视图和侧视图都是矩形俯视图为正方形在该几何体上任意选择4个顶点以这4个
①②③
②③
①③
①②
把一个正四面体的每个表面都分成9个相同的等边三角形用任意颜色给这些小三角形上色要求有公共边的小三角形
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"It’snouseMum"saidJohnny．"I’mjustnogoodatdancing．" "You’vegottokeeptrying．Tonightwillbe16dear．TryaturnwiththatprettyLisette．" Johnny17EverySaturdaynightusedtobethebestoftheweek．Heandhisparentswenttothe18attheClubwherehisheroAlcideplayedtheaccordion手风琴withtheband．Butlatelyeverythinghadchanged．NowthatJohnnywasolderhewas19todancewithagirl! 20JohnnyandhisparentsarrivedattheClubmusichadalreadystarted．Johnnygotuphis21toapproachLisette．“MayIhavethisdance”Johnnyasked．“That’sallright”saidLisette．JohnnystruggledtokeepupwithLisette’s22stepsbuthewasalwaysonebeatbehindher.ThenJohnnyheardhisfriendPierresay"Look!Johnnyhastwoleftfeet!"23burstfromthecrowd.Johnny24andranoutsidedeterminednevertogotoanotherdance. ThenextSaturdayAlcide25toJohnny’shouseforsomepotatoes.HehappenedtohearJohnnyplayingtheaccordion.Alcide’seyes26"Bringthataccordionandplaysomesongsto-night"Alcidesaid.ThenhedroveoffleavingJohnnystaringopen-mouthed27him. AttheClubJohnnyscannedthecrowdforLisetteand28her.ThebandplayedforalongtimebeforeAlcidesaid"DearfriendsIgota29foryoutonight.YoungJohnnyisgoingtojoinus!"30Johnnysteppedupontheplatformhiseyesonthefloor.Hebegantoplayandtheband31behindhim.Whenthesongendedheheardcheers.Johnnykeptplayinguntilthedancewas32"Youdidafinejobtonight.PlaywithusagainnextSaturdaynight"Alcidesaid."Yessir!"saidJohnny.33hewentoutsideJohnnysawLisetteandherfriendsnearthedoor.Lisettestepped34smiling."Youplayedreallygoodtonight!"shesaid. "Thankyou"Johnnyblushed脸红.AshewalkedonPierre35movedoutofthewayforhimtopass. Johnnypattedhisaccordion.CometothinkofitinhiswholelifehehadneveronceseenAlcideoutonthedancefloor. 20
C Statusesaremarveloushumaninventionsthatenableustogetalongwithoneanotherandtodeterminewherewe"fit"insociety.Aswegoaboutoureverydayliveswementallyattempttoplacepeopleintermoftheirstatuses.Forexamplewemustjudgewhetherthepeopleinlibraryisareaderoralibrarianwhetherthetelephonecallerisafriendorasalesmanwhethertheunfamiliarpersononourpropertyisathieforameterreaderandsoon. Thestatusesweassumeoftenvarywiththepeopleweencounterandchangethroughoutlife.Mostofuscanatveryhighspeedassumethestatusesthatvarioussituationsrequire.Muchofsocialinteractionconsistsofidentifyingandselectingamongappropriatestatusesandallowingotherpeopletoassumetheirstatusesinrelationtous.Thismeansthatwefitouractionstothoseofotherpeoplebasedonaconstantmentalprocessofappraisalandinterpretation.Althoughsomeofusfindthetaskmoredifficultthanothersmostofusperformitrathereffortlessly. Statuseshasbeencomparedtoready-madeclothes.Withincertainlimitsthebuyercanchoosestyleandfabric.ButanAmericanisnotfreetochoosethecostumeofaChinesepeasantorthatofaHinduprince.Wemustchoosefromamongtheclothingpresentedbyfitaswellasbyourpocket-boob.Havingmadeachoicefromminoradjustmentswetendtobelimitedtowhatthestoreschoiceamongthemislimited. ThewordappraisalLine5Para.2mostprobablymeans
D Howshouldoneinvestasumofmoneyinthesedaysofinflation通货膨胀Leftinabankitwillhardlykeepitsvaluehoweverhightheinterestrateis.OnlyabravemanoraveryrichonedarestobuyandsellontheStockMarket.Todayitseemsthatoneofthebestwaystoprotectyoursavingsandevenincreaseyourwealthistobuybeautifulobjectsfromthepast.HereIamgoingtooffersomeadviceoncollectingantiqueclockswhichIpersonallyconsiderareamongthemostinterestingofantiques. Isometimeswonderwhatabeingfromanotherplanetmightreportbackaboutourwayoflife."TheplanetEarthisruledbyamysteriouscreaturethatsitsorstandsinaroomandmakesastrangetickingsound.Ithasafacewithtwelveblackmarksandtwohands.Mencandonothingwithoutitspermissionanditfastensitsyoungroundpeople’swristssothateverywheremengotheyarestillunderitscontrol.ThiscreatureistherealmasterofEarthandmenareitsslaves." Whetherornotweareslavesoftimetodaydependsonourcultureandpersonalitybutitisbelievedthatmanyyearsagokingskeptspecialslavestotellthetime.Certainmenwereverycleveratmeasuringthetimeofdayaccordingtothebeatingoftheirownhearts.Theyweremadetostandinafixedplaceandeveryhourorsowouldshoutthetime.Soitseemsthatthefirstclockswerehumanbeings. Howevermenquicklyfoundmoreconvenientandreliablewaysoftellingthetime.Theylearnedtousetheshadowscastbythesun.Theymarkedthehoursoncandlesusedsandinhour-glassesandinventedwater-clocks.Indeedanyseriousstudentofantiquesshouldspendasmuchtimeaspossiblevisitingpalacesstatelyhomesandmuseumstoseesomeofthefinestexamplesofclocksfromthepast. Antiqueclockscouldbeveryexpensivebutoneofthejoysofcollectingclocksisthatitisstillpossibletofindquitecheaponesforyourownhome.Afterallifyouaregoingtoberuledbythetimewhynotinvestinairantiqueclockandperhapsmakeafutureprofit Byquoting引用theremarkofabeingfromanotherplanettheauthorintendsto
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B Treesshouldonlybepruned修剪whenthereisagoodandclearreasonfordoingsoandfortunatelythenumberofsuchreasonsissmall.Pruninginvolvescuttingawayofovergrownandunwantedbranchesandtheinexperiencedgardenercanbeencouragedbythethoughtthatmoredamageresultsfromdoingitunnecessarilythanfromleavingthetreestogrowintheirownways. Firstpruningmaybedonetomakesurethattreeshaveadesiredshapeorsize.Theobjectmaybetogetatreeoftherightheightandatthesametimetohelpthegrowthofsmallsidebrancheswhichwillthickenitsappearanceorgiveitaspecialshape.Secondlypruningmaybedonetomakethetreehealthier.Youmaycutoutdiseasedordeadwoodorbranchesthatarerubbingagainsteachotherandthuscausingwounds.Thehealthofatreemaybeencouragedbyremovingthebranchesthatarelockingupthecentreandsopreventingthefreemovementofair. Oneresultofpruningisthatanopenwouldisleftonthetreeandthisprovidesaneasyentryfordiseasesbutitisawoundthatwillheal愈合.Oftenthereisaracebetweenthehealingandthediseaseastowhetherthetreewillliveordieorthatthereisaperiodwhenthetreeisatrisk.Itshouldbetheaimofeverygardenertoreducetheriskasfaraspossible.Itisessentialtomaketheareawhichhasbeenprunedsmoothandcleanforhealingwillbesloweddownbyroughness.Youshouldallowthecutsurfacetdryforafewhoursandthenpaintitwithoneofthesubstancesavailablefromgardenshopsproducedespeciallyforthispurpose.Pruningisusuallydoneinwinterforthenyoucanseetheshapeofthetreeclearlywithouttheinterference妨碍fromtheleavesanditistooveryunlikelythatthecutsyoumakewillbleed.Ifthisdoeshappenitisofcourseimpossibletopaintthemproperly. Agoodgardenerprunesatree
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"It’snouseMum"saidJohnny．"I’mjustnogoodatdancing．" "You’vegottokeeptrying．Tonightwillbe16dear．TryaturnwiththatprettyLisette．" Johnny17EverySaturdaynightusedtobethebestoftheweek．Heandhisparentswenttothe18attheClubwherehisheroAlcideplayedtheaccordion手风琴withtheband．Butlatelyeverythinghadchanged．NowthatJohnnywasolderhewas19todancewithagirl! 20JohnnyandhisparentsarrivedattheClubmusichadalreadystarted．Johnnygotuphis21toapproachLisette．“MayIhavethisdance”Johnnyasked．“That’sallright”saidLisette．JohnnystruggledtokeepupwithLisette’s22stepsbuthewasalwaysonebeatbehindher.ThenJohnnyheardhisfriendPierresay"Look!Johnnyhastwoleftfeet!"23burstfromthecrowd.Johnny24andranoutsidedeterminednevertogotoanotherdance. ThenextSaturdayAlcide25toJohnny’shouseforsomepotatoes.HehappenedtohearJohnnyplayingtheaccordion.Alcide’seyes26"Bringthataccordionandplaysomesongsto-night"Alcidesaid.ThenhedroveoffleavingJohnnystaringopen-mouthed27him. AttheClubJohnnyscannedthecrowdforLisetteand28her.ThebandplayedforalongtimebeforeAlcidesaid"DearfriendsIgota29foryoutonight.YoungJohnnyisgoingtojoinus!"30Johnnysteppedupontheplatformhiseyesonthefloor.Hebegantoplayandtheband31behindhim.Whenthesongendedheheardcheers.Johnnykeptplayinguntilthedancewas32"Youdidafinejobtonight.PlaywithusagainnextSaturdaynight"Alcidesaid."Yessir!"saidJohnny.33hewentoutsideJohnnysawLisetteandherfriendsnearthedoor.Lisettestepped34smiling."Youplayedreallygoodtonight!"shesaid. "Thankyou"Johnnyblushed脸红.AshewalkedonPierre35movedoutofthewayforhimtopass. Johnnypattedhisaccordion.CometothinkofitinhiswholelifehehadneveronceseenAlcideoutonthedancefloor. 16
C Statusesaremarveloushumaninventionsthatenableustogetalongwithoneanotherandtodeterminewherewe"fit"insociety.Aswegoaboutoureverydayliveswementallyattempttoplacepeopleintermoftheirstatuses.Forexamplewemustjudgewhetherthepeopleinlibraryisareaderoralibrarianwhetherthetelephonecallerisafriendorasalesmanwhethertheunfamiliarpersononourpropertyisathieforameterreaderandsoon. Thestatusesweassumeoftenvarywiththepeopleweencounterandchangethroughoutlife.Mostofuscanatveryhighspeedassumethestatusesthatvarioussituationsrequire.Muchofsocialinteractionconsistsofidentifyingandselectingamongappropriatestatusesandallowingotherpeopletoassumetheirstatusesinrelationtous.Thismeansthatwefitouractionstothoseofotherpeoplebasedonaconstantmentalprocessofappraisalandinterpretation.Althoughsomeofusfindthetaskmoredifficultthanothersmostofusperformitrathereffortlessly. Statuseshasbeencomparedtoready-madeclothes.Withincertainlimitsthebuyercanchoosestyleandfabric.ButanAmericanisnotfreetochoosethecostumeofaChinesepeasantorthatofaHinduprince.Wemustchoosefromamongtheclothingpresentedbyfitaswellasbyourpocket-boob.Havingmadeachoicefromminoradjustmentswetendtobelimitedtowhatthestoreschoiceamongthemislimited. Inthefirstparagraphthewritertellsusthatstatusescanhelpus
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ItssomewhatambitioustitlewasTheBookofLifeanditattemptedtoshowhowmuchanobservantmanmightlearnbyanaccurateandsystematicexaminationofallthatcameinhisway.
"It’snouseMum"saidJohnny．"I’mjustnogoodatdancing．" "You’vegottokeeptrying．Tonightwillbe16dear．TryaturnwiththatprettyLisette．" Johnny17EverySaturdaynightusedtobethebestoftheweek．Heandhisparentswenttothe18attheClubwherehisheroAlcideplayedtheaccordion手风琴withtheband．Butlatelyeverythinghadchanged．NowthatJohnnywasolderhewas19todancewithagirl! 20JohnnyandhisparentsarrivedattheClubmusichadalreadystarted．Johnnygotuphis21toapproachLisette．“MayIhavethisdance”Johnnyasked．“That’sallright”saidLisette．JohnnystruggledtokeepupwithLisette’s22stepsbuthewasalwaysonebeatbehindher.ThenJohnnyheardhisfriendPierresay"Look!Johnnyhastwoleftfeet!"23burstfromthecrowd.Johnny24andranoutsidedeterminednevertogotoanotherdance. ThenextSaturdayAlcide25toJohnny’shouseforsomepotatoes.HehappenedtohearJohnnyplayingtheaccordion.Alcide’seyes26"Bringthataccordionandplaysomesongsto-night"Alcidesaid.ThenhedroveoffleavingJohnnystaringopen-mouthed27him. AttheClubJohnnyscannedthecrowdforLisetteand28her.ThebandplayedforalongtimebeforeAlcidesaid"DearfriendsIgota29foryoutonight.YoungJohnnyisgoingtojoinus!"30Johnnysteppedupontheplatformhiseyesonthefloor.Hebegantoplayandtheband31behindhim.Whenthesongendedheheardcheers.Johnnykeptplayinguntilthedancewas32"Youdidafinejobtonight.PlaywithusagainnextSaturdaynight"Alcidesaid."Yessir!"saidJohnny.33hewentoutsideJohnnysawLisetteandherfriendsnearthedoor.Lisettestepped34smiling."Youplayedreallygoodtonight!"shesaid. "Thankyou"Johnnyblushed脸红.AshewalkedonPierre35movedoutofthewayforhimtopass. Johnnypattedhisaccordion.CometothinkofitinhiswholelifehehadneveronceseenAlcideoutonthedancefloor. 18
—Haveyougotanyideaforthesummervacation—Idon’tmindwherewego______there’ssunseaandbeach．
墨子的教育思想中除注重文史知识的掌握和逻辑思维能力的培养外还包括
"It’snouseMum"saidJohnny．"I’mjustnogoodatdancing．" "You’vegottokeeptrying．Tonightwillbe16dear．TryaturnwiththatprettyLisette．" Johnny17EverySaturdaynightusedtobethebestoftheweek．Heandhisparentswenttothe18attheClubwherehisheroAlcideplayedtheaccordion手风琴withtheband．Butlatelyeverythinghadchanged．NowthatJohnnywasolderhewas19todancewithagirl! 20JohnnyandhisparentsarrivedattheClubmusichadalreadystarted．Johnnygotuphis21toapproachLisette．“MayIhavethisdance”Johnnyasked．“That’sallright”saidLisette．JohnnystruggledtokeepupwithLisette’s22stepsbuthewasalwaysonebeatbehindher.ThenJohnnyheardhisfriendPierresay"Look!Johnnyhastwoleftfeet!"23burstfromthecrowd.Johnny24andranoutsidedeterminednevertogotoanotherdance. ThenextSaturdayAlcide25toJohnny’shouseforsomepotatoes.HehappenedtohearJohnnyplayingtheaccordion.Alcide’seyes26"Bringthataccordionandplaysomesongsto-night"Alcidesaid.ThenhedroveoffleavingJohnnystaringopen-mouthed27him. AttheClubJohnnyscannedthecrowdforLisetteand28her.ThebandplayedforalongtimebeforeAlcidesaid"DearfriendsIgota29foryoutonight.YoungJohnnyisgoingtojoinus!"30Johnnysteppedupontheplatformhiseyesonthefloor.Hebegantoplayandtheband31behindhim.Whenthesongendedheheardcheers.Johnnykeptplayinguntilthedancewas32"Youdidafinejobtonight.PlaywithusagainnextSaturdaynight"Alcidesaid."Yessir!"saidJohnny.33hewentoutsideJohnnysawLisetteandherfriendsnearthedoor.Lisettestepped34smiling."Youplayedreallygoodtonight!"shesaid. "Thankyou"Johnnyblushed脸红.AshewalkedonPierre35movedoutofthewayforhimtopass. Johnnypattedhisaccordion.CometothinkofitinhiswholelifehehadneveronceseenAlcideoutonthedancefloor. 22
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Someadvancedmaterialsareanoldstandardwithanewtwist.Thenewestfiberopticcablesthatcarrytelephonecallscross-countryaremadeofglasssotransparentthatapieceof100milesthickisclearerthanastandardwindowpane.
E Manypeoplebelievetheglarefromsnowcausessnowblindnenss.Yetdarkglassesornottheyfindthemselvessufferingfromheadachesandwateringeyesandevensnowblindnesswhenex-posedtoseveralhoursof"snowlight". TheUnitedStatesarmyhasnowdeterminedthatglarefromsnowdoesnotcausesnowblindnessintroopsinasnow-coveredcountry.Ratheraman’seyesfrequentlyfindnothingtofocusoninabroadexpanseofbarrensnow-coveredterrain.Sohisgazecontinuallyshiftsandjumpsbackandforthovertheentirelandscapeinsearchofsomethingtolookat.Findingnothinghourafterhourtheeyesneverstopsearchingandtheeyeballsbecomesoreandtheeyemusclesache.Natureoffsetsthisirritationbyproducingmoreandfluidwhichcoverstheeyeball.Thefluidcoverstheeyeballinincreasingquantityuntilvisionblursthenisobservedandtheresultistotaleventhoughtemporarysnowblindness. Experimentsledthearmytoasimplemethodofovercomingthisproblem.Scoutsaheadofamainbodyoftroopsaretrainedtoshakesnowfromevergreenbushescreatingadottedlineastheycrosscompletelysnow-coveredlandscape.Eventhescoutsthemselvesthrowlightweightdarkcoloredobjectsaheadonwhichtheytoocanfocus.Themenfollowingcanthenseesomething.Theirgazeisarrested.Theireyesfocusonabushandhavingfoundsomethingtoseestopscouringthesnow-blanketedlanscape.Byfocusingtheirattentionononeobjectatatimethemencancrossthesnowwithoutbecominghopelesslysnowblindorlost.Inthiswaytheproblemofcrossingasolidwhiteterrainisovercome. Topreventheadacheswateringeyesandblindnesscausedbytheglarefromsnowdarkglassesare
C Statusesaremarveloushumaninventionsthatenableustogetalongwithoneanotherandtodeterminewherewe"fit"insociety.Aswegoaboutoureverydayliveswementallyattempttoplacepeopleintermoftheirstatuses.Forexamplewemustjudgewhetherthepeopleinlibraryisareaderoralibrarianwhetherthetelephonecallerisafriendorasalesmanwhethertheunfamiliarpersononourpropertyisathieforameterreaderandsoon. Thestatusesweassumeoftenvarywiththepeopleweencounterandchangethroughoutlife.Mostofuscanatveryhighspeedassumethestatusesthatvarioussituationsrequire.Muchofsocialinteractionconsistsofidentifyingandselectingamongappropriatestatusesandallowingotherpeopletoassumetheirstatusesinrelationtous.Thismeansthatwefitouractionstothoseofotherpeoplebasedonaconstantmentalprocessofappraisalandinterpretation.Althoughsomeofusfindthetaskmoredifficultthanothersmostofusperformitrathereffortlessly. Statuseshasbeencomparedtoready-madeclothes.Withincertainlimitsthebuyercanchoosestyleandfabric.ButanAmericanisnotfreetochoosethecostumeofaChinesepeasantorthatofaHinduprince.Wemustchoosefromamongtheclothingpresentedbyfitaswellasbyourpocket-boob.Havingmadeachoicefromminoradjustmentswetendtobelimitedtowhatthestoreschoiceamongthemislimited. BysayingthatanAmericanisnotfreetochoosethecostumeofaChinesepeasantorthatofaHinduprinceLines23Para.3thewritermeans
普通中小学教育的性质是
"It’snouseMum"saidJohnny．"I’mjustnogoodatdancing．" "You’vegottokeeptrying．Tonightwillbe16dear．TryaturnwiththatprettyLisette．" Johnny17EverySaturdaynightusedtobethebestoftheweek．Heandhisparentswenttothe18attheClubwherehisheroAlcideplayedtheaccordion手风琴withtheband．Butlatelyeverythinghadchanged．NowthatJohnnywasolderhewas19todancewithagirl! 20JohnnyandhisparentsarrivedattheClubmusichadalreadystarted．Johnnygotuphis21toapproachLisette．“MayIhavethisdance”Johnnyasked．“That’sallright”saidLisette．JohnnystruggledtokeepupwithLisette’s22stepsbuthewasalwaysonebeatbehindher.ThenJohnnyheardhisfriendPierresay"Look!Johnnyhastwoleftfeet!"23burstfromthecrowd.Johnny24andranoutsidedeterminednevertogotoanotherdance. ThenextSaturdayAlcide25toJohnny’shouseforsomepotatoes.HehappenedtohearJohnnyplayingtheaccordion.Alcide’seyes26"Bringthataccordionandplaysomesongsto-night"Alcidesaid.ThenhedroveoffleavingJohnnystaringopen-mouthed27him. AttheClubJohnnyscannedthecrowdforLisetteand28her.ThebandplayedforalongtimebeforeAlcidesaid"DearfriendsIgota29foryoutonight.YoungJohnnyisgoingtojoinus!"30Johnnysteppedupontheplatformhiseyesonthefloor.Hebegantoplayandtheband31behindhim.Whenthesongendedheheardcheers.Johnnykeptplayinguntilthedancewas32"Youdidafinejobtonight.PlaywithusagainnextSaturdaynight"Alcidesaid."Yessir!"saidJohnny.33hewentoutsideJohnnysawLisetteandherfriendsnearthedoor.Lisettestepped34smiling."Youplayedreallygoodtonight!"shesaid. "Thankyou"Johnnyblushed脸红.AshewalkedonPierre35movedoutofthewayforhimtopass. Johnnypattedhisaccordion.CometothinkofitinhiswholelifehehadneveronceseenAlcideoutonthedancefloor. 26
E Manypeoplebelievetheglarefromsnowcausessnowblindnenss.Yetdarkglassesornottheyfindthemselvessufferingfromheadachesandwateringeyesandevensnowblindnesswhenex-posedtoseveralhoursof"snowlight". TheUnitedStatesarmyhasnowdeterminedthatglarefromsnowdoesnotcausesnowblindnessintroopsinasnow-coveredcountry.Ratheraman’seyesfrequentlyfindnothingtofocusoninabroadexpanseofbarrensnow-coveredterrain.Sohisgazecontinuallyshiftsandjumpsbackandforthovertheentirelandscapeinsearchofsomethingtolookat.Findingnothinghourafterhourtheeyesneverstopsearchingandtheeyeballsbecomesoreandtheeyemusclesache.Natureoffsetsthisirritationbyproducingmoreandfluidwhichcoverstheeyeball.Thefluidcoverstheeyeballinincreasingquantityuntilvisionblursthenisobservedandtheresultistotaleventhoughtemporarysnowblindness. Experimentsledthearmytoasimplemethodofovercomingthisproblem.Scoutsaheadofamainbodyoftroopsaretrainedtoshakesnowfromevergreenbushescreatingadottedlineastheycrosscompletelysnow-coveredlandscape.Eventhescoutsthemselvesthrowlightweightdarkcoloredobjectsaheadonwhichtheytoocanfocus.Themenfollowingcanthenseesomething.Theirgazeisarrested.Theireyesfocusonabushandhavingfoundsomethingtoseestopscouringthesnow-blanketedlanscape.Byfocusingtheirattentionononeobjectatatimethemencancrossthesnowwithoutbecominghopelesslysnowblindorlost.Inthiswaytheproblemofcrossingasolidwhiteterrainisovercome. Asuitabletideforthispassagewouldbe
E Manypeoplebelievetheglarefromsnowcausessnowblindnenss.Yetdarkglassesornottheyfindthemselvessufferingfromheadachesandwateringeyesandevensnowblindnesswhenex-posedtoseveralhoursof"snowlight". TheUnitedStatesarmyhasnowdeterminedthatglarefromsnowdoesnotcausesnowblindnessintroopsinasnow-coveredcountry.Ratheraman’seyesfrequentlyfindnothingtofocusoninabroadexpanseofbarrensnow-coveredterrain.Sohisgazecontinuallyshiftsandjumpsbackandforthovertheentirelandscapeinsearchofsomethingtolookat.Findingnothinghourafterhourtheeyesneverstopsearchingandtheeyeballsbecomesoreandtheeyemusclesache.Natureoffsetsthisirritationbyproducingmoreandfluidwhichcoverstheeyeball.Thefluidcoverstheeyeballinincreasingquantityuntilvisionblursthenisobservedandtheresultistotaleventhoughtemporarysnowblindness. Experimentsledthearmytoasimplemethodofovercomingthisproblem.Scoutsaheadofamainbodyoftroopsaretrainedtoshakesnowfromevergreenbushescreatingadottedlineastheycrosscompletelysnow-coveredlandscape.Eventhescoutsthemselvesthrowlightweightdarkcoloredobjectsaheadonwhichtheytoocanfocus.Themenfollowingcanthenseesomething.Theirgazeisarrested.Theireyesfocusonabushandhavingfoundsomethingtoseestopscouringthesnow-blanketedlanscape.Byfocusingtheirattentionononeobjectatatimethemencancrossthesnowwithoutbecominghopelesslysnowblindorlost.Inthiswaytheproblemofcrossingasolidwhiteterrainisovercome. Snowblindnessmaybeavoidedby
"It’snouseMum"saidJohnny．"I’mjustnogoodatdancing．" "You’vegottokeeptrying．Tonightwillbe16dear．TryaturnwiththatprettyLisette．" Johnny17EverySaturdaynightusedtobethebestoftheweek．Heandhisparentswenttothe18attheClubwherehisheroAlcideplayedtheaccordion手风琴withtheband．Butlatelyeverythinghadchanged．NowthatJohnnywasolderhewas19todancewithagirl! 20JohnnyandhisparentsarrivedattheClubmusichadalreadystarted．Johnnygotuphis21toapproachLisette．“MayIhavethisdance”Johnnyasked．“That’sallright”saidLisette．JohnnystruggledtokeepupwithLisette’s22stepsbuthewasalwaysonebeatbehindher.ThenJohnnyheardhisfriendPierresay"Look!Johnnyhastwoleftfeet!"23burstfromthecrowd.Johnny24andranoutsidedeterminednevertogotoanotherdance. ThenextSaturdayAlcide25toJohnny’shouseforsomepotatoes.HehappenedtohearJohnnyplayingtheaccordion.Alcide’seyes26"Bringthataccordionandplaysomesongsto-night"Alcidesaid.ThenhedroveoffleavingJohnnystaringopen-mouthed27him. AttheClubJohnnyscannedthecrowdforLisetteand28her.ThebandplayedforalongtimebeforeAlcidesaid"DearfriendsIgota29foryoutonight.YoungJohnnyisgoingtojoinus!"30Johnnysteppedupontheplatformhiseyesonthefloor.Hebegantoplayandtheband31behindhim.Whenthesongendedheheardcheers.Johnnykeptplayinguntilthedancewas32"Youdidafinejobtonight.PlaywithusagainnextSaturdaynight"Alcidesaid."Yessir!"saidJohnny.33hewentoutsideJohnnysawLisetteandherfriendsnearthedoor.Lisettestepped34smiling."Youplayedreallygoodtonight!"shesaid. "Thankyou"Johnnyblushed脸红.AshewalkedonPierre35movedoutofthewayforhimtopass. Johnnypattedhisaccordion.CometothinkofitinhiswholelifehehadneveronceseenAlcideoutonthedancefloor. 24
D Howshouldoneinvestasumofmoneyinthesedaysofinflation通货膨胀Leftinabankitwillhardlykeepitsvaluehoweverhightheinterestrateis.OnlyabravemanoraveryrichonedarestobuyandsellontheStockMarket.Todayitseemsthatoneofthebestwaystoprotectyoursavingsandevenincreaseyourwealthistobuybeautifulobjectsfromthepast.HereIamgoingtooffersomeadviceoncollectingantiqueclockswhichIpersonallyconsiderareamongthemostinterestingofantiques. Isometimeswonderwhatabeingfromanotherplanetmightreportbackaboutourwayoflife."TheplanetEarthisruledbyamysteriouscreaturethatsitsorstandsinaroomandmakesastrangetickingsound.Ithasafacewithtwelveblackmarksandtwohands.Mencandonothingwithoutitspermissionanditfastensitsyoungroundpeople’swristssothateverywheremengotheyarestillunderitscontrol.ThiscreatureistherealmasterofEarthandmenareitsslaves." Whetherornotweareslavesoftimetodaydependsonourcultureandpersonalitybutitisbelievedthatmanyyearsagokingskeptspecialslavestotellthetime.Certainmenwereverycleveratmeasuringthetimeofdayaccordingtothebeatingoftheirownhearts.Theyweremadetostandinafixedplaceandeveryhourorsowouldshoutthetime.Soitseemsthatthefirstclockswerehumanbeings. Howevermenquicklyfoundmoreconvenientandreliablewaysoftellingthetime.Theylearnedtousetheshadowscastbythesun.Theymarkedthehoursoncandlesusedsandinhour-glassesandinventedwater-clocks.Indeedanyseriousstudentofantiquesshouldspendasmuchtimeaspossiblevisitingpalacesstatelyhomesandmuseumstoseesomeofthefinestexamplesofclocksfromthepast. Antiqueclockscouldbeveryexpensivebutoneofthejoysofcollectingclocksisthatitisstillpossibletofindquitecheaponesforyourownhome.Afterallifyouaregoingtoberuledbythetimewhynotinvestinairantiqueclockandperhapsmakeafutureprofit TheunderlinedphrasestatelyhomesinParagraph4means
人际关系的功能主要体现在哪些方面
Thegirllikes______and______．
在实施中小学继续教育工程中要把放在突出地位
—Whichofthetwocomputergamesdidyouprefer—ActuallyIdidn’tlike______.
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