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tan15°+cot15°的值是（）
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如图在Rt△ABC中∠C.＝90°斜边AB的垂直平分线分别交ABBC于点E.和点D.已知BD∶CD＝
理解数学兴趣小组在探究如何求tan15°的值经过思考讨论交流得到以下思路思路一如图1在Rt△ABC中
如图小明打算测量旗杆AH的高度他首先在教学楼四楼的点B.处测得旗杆顶端A.的仰角为15°然后在三楼的
tan15°的值是
A
B
C
D
计算tan75°－tan15°－tan15°·tan75°的结果等于
－
－
如图山脚下有一棵树AB小华从点B沿山坡向上走50米到达点D用高为1.5米的测角仪CD测得树顶的仰角为
AB为晨昏线O.处有一旗杆为5米且该日旗杆影长始终不变为18.5米并作顺时针旋转C.处所在整条纬线此
15°N，150°W
15°S，30°E
15°N， 30°E
15°S，150°W 16.此时，属于该日的地区占全球的比例大约是( ) A.9／24B.15／24C.11／12D.7／2 17.右图中的H.的值为（ ） A.60° B.36° C.30° D.47° 18.该日C.点一天内人影变化为（ ）
如图在ΔABC中∠C.=900延长CA至D.使AD=AB∠BAC=300则由图可得cot150的值是
某水库决定对堤坝进行处理如右图所示水库大巴的迎水面的坡角为坝高为10米现要价高大坝使坡度为11坡度坡
10cotα-10
10tanα-10
10tanα
10cotα
已知αβ都是第二象限角且cosα>cosβ则
α<β
sinα>sinβ
tanα>tanβ
cotα
要求tan30°的值可构造如图所示的直角三角形进行计算作Rt△ABC使∠C=90°斜边AB=2直角边
设αβ是第二象限的角且sinα＜sinβ则下列不等式能成立的是．
cosα＜cosβ
tanα＜tanβ
cotα＞cotβ
secα＜secβ
如图在顶角为30°的等腰三角形ABC中.AB=AC.若过点C.作CD⊥AB于点D.则∠BCD=15°
要求30°角的正切值可以构造如图所示的直角三角形进行计算．作Rt△ABC使∠C=90°斜边AB=2直
要求tan30°的值可构造如图14所示的直角三角形进行计算作Rt△ABC使∠C=90°斜边AB=2直
设αβ是第二象限的角且sinα＜sinβ则下列不等式能成立的是
cosα＜cosβ
tanα＜tanβ
cotα＞cotβ
secα＜secβ
如图在顶角为30°的等腰三角形ABC中AB=AC若过点C.作CD⊥AB于点D.则∠BCD=15°.根
tan15°+cot15°等于
2
4
某商场为方便消费者购物准备将原来的阶梯式自动扶梯改造成斜坡式自动扶梯.如图十四所示已知原阶梯式自动扶
要求tan30°的值可构造如图24-3-9所示的直角三角形进行计算作Rt△ABC使∠C=90°斜边A
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A Fromthehealthpointofviewwearelivinginamarvelousage.Weareimmunizedfrombirthagainstmanyofthemostdangerousdiseases.Alargenumberofoncefatalillnessescannowbecuredbymoderndrugsandsurgery.Itisalmostcertainthatonedayremedieswillbefoundforthemoststubbornremainingdiseases.Theexpectationoflifehasincreasedenormously.Butthoughthepossibilityoflivingalongandhappylifeisgreaterthaneverbeforeeverydaywewitnessthein-credibleslaughterofmenwomenandchildrenontheroads.Manversusthemotorcar!Itisanever-endingbattlewhichmanislosing.Thousandsofpeopleovertheworldarekilledorhorriblykilledeachyearandwearequietlysittingbackandlettingithappen. Ithasbeenrightlysaidthatwhenamanissittingbehindasteeringwheelhiscarbecomestheextensionofhispersonality.Thereisnodoubtthatthemotorcaroftenbringsoutaman’sveryworstqualities.Peoplewhoarenormallyquietandpleasantmaybecomeunrecognizablewhentheyarebe-hindasteering-wheel.Theysweartheyareill-manneredandaggressivewillfulastwo-year-oldsandutterlyselfish.Alltheirhiddenfrustrationsdisappointmentsandjealousiesseemtobebroughttothesurfacebytheactofdriving. Thesurprisingthingisthatsocietysmilessobenignlyonthemotoristandseemstocondonehisbehaviour.Everythingisdoneforhisconvenience.Citiesareallowedtobecomealmostuninhabitablebecauseofheavytraffic;townsaremadeuglybyhugecarparks;thecountrysideisdesecratedbyroadnetworks;andthemassannualslaughterbecomesnothingmorethanastatistictobeconvenientlyforgotten. Itishightimeaworldcodewerecreatedtoreducethissenselesswasteofhumanlife.Withregardtodrivingthelawsofsomecountriesarenotoriouslylaxandeventhestrictestarenotstrictenough.Acodewhichwasuniversallyacceptedcouldonlyhaveadramaticallybeneficialeffectontheaccidentrate.Hereareafewexamplesofsomeofthethingsthatmightbedone.Thedrivingtestshouldbestandardizedandmadefarmoredifficultthanitis;allthedriversshouldbemadetotakeatesteverythreeyearsorso;theageatwhichyoungpeopleareallowedtodriveanyvehicleshouldberaisedtoatleast21;allvehiclesshouldbeputthroughstringentannualtestsforsafety.Eventhesmallestamountofalcoholinthebloodcanimpairaperson’sdrivingability.Presentdrinkinganddrivinglawswheretheyexistshouldbemademuchstricter.Maximumandminimumspeedlimitsshouldbeimposedonallroads.GovernmentsshouldlaydownsafetyspecificationsformanufacturersashasbeendoneintheUSA.Alladvertisingstressingpowerandperformanceshouldbebanned.Thesemeasuresmaysoundinordinatelyharsh.Butsurelynothingshouldbe’consideredassevereifitresultsinreducingtheannualtollofhumanlife.Afteralltheworldisforhumanbeingsnotmotorcars. WhichofthefollowingisNOTmentionedasawayagainsttrafficaccidents
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C Statusesaremarveloushumaninventionsthatenableustogetalongwithoneanotherandtodeterminewherewe"fit"insociety.Aswegoaboutoureverydayliveswementallyattempttoplacepeopleintermoftheirstatuses.Forexamplewemustjudgewhetherthepeopleinlibraryisareaderoralibrarianwhetherthetelephonecallerisafriendorasalesmanwhethertheunfamiliarpersononourpropertyisathieforameterreaderandsoon. Thestatusesweassumeoftenvarywiththepeopleweencounterandchangethroughoutlife.Mostofuscanatveryhighspeedassumethestatusesthatvarioussituationsrequire.Muchofsocialinteractionconsistsofidentifyingandselectingamongappropriatestatusesandallowingotherpeopletoassumetheirstatusesinrelationtous.Thismeansthatwefitouractionstothoseofotherpeoplebasedonaconstantmentalprocessofappraisalandinterpretation.Althoughsomeofusfindthetaskmoredifficultthanothersmostofusperformitrathereffortlessly. Statuseshasbeencomparedtoready-madeclothes.Withincertainlimitsthebuyercanchoosestyleandfabric.ButanAmericanisnotfreetochoosethecostumeofaChinesepeasantorthatofaHinduprince.Wemustchoosefromamongtheclothingpresentedbyfitaswellasbyourpocket-boob.Havingmadeachoicefromminoradjustmentswetendtobelimitedtowhatthestoreschoiceamongthemislimited. Accordingtothewriterpeopleoftenassumedifferentstatuses
B Treesshouldonlybepruned修剪whenthereisagoodandclearreasonfordoingsoandfortunatelythenumberofsuchreasonsissmall.Pruninginvolvescuttingawayofovergrownandunwantedbranchesandtheinexperiencedgardenercanbeencouragedbythethoughtthatmoredamageresultsfromdoingitunnecessarilythanfromleavingthetreestogrowintheirownways. Firstpruningmaybedonetomakesurethattreeshaveadesiredshapeorsize.Theobjectmaybetogetatreeoftherightheightandatthesametimetohelpthegrowthofsmallsidebrancheswhichwillthickenitsappearanceorgiveitaspecialshape.Secondlypruningmaybedonetomakethetreehealthier.Youmaycutoutdiseasedordeadwoodorbranchesthatarerubbingagainsteachotherandthuscausingwounds.Thehealthofatreemaybeencouragedbyremovingthebranchesthatarelockingupthecentreandsopreventingthefreemovementofair. Oneresultofpruningisthatanopenwouldisleftonthetreeandthisprovidesaneasyentryfordiseasesbutitisawoundthatwillheal愈合.Oftenthereisaracebetweenthehealingandthediseaseastowhetherthetreewillliveordieorthatthereisaperiodwhenthetreeisatrisk.Itshouldbetheaimofeverygardenertoreducetheriskasfaraspossible.Itisessentialtomaketheareawhichhasbeenprunedsmoothandcleanforhealingwillbesloweddownbyroughness.Youshouldallowthecutsurfacetdryforafewhoursandthenpaintitwithoneofthesubstancesavailablefromgardenshopsproducedespeciallyforthispurpose.Pruningisusuallydoneinwinterforthenyoucanseetheshapeofthetreeclearlywithouttheinterference妨碍fromtheleavesanditistooveryunlikelythatthecutsyoumakewillbleed.Ifthisdoeshappenitisofcourseimpossibletopaintthemproperly. Whyshouldpruningbedone
—I’mgoingonatriptoHainanaftertheexam．—Really______!
C Statusesaremarveloushumaninventionsthatenableustogetalongwithoneanotherandtodeterminewherewe"fit"insociety.Aswegoaboutoureverydayliveswementallyattempttoplacepeopleintermoftheirstatuses.Forexamplewemustjudgewhetherthepeopleinlibraryisareaderoralibrarianwhetherthetelephonecallerisafriendorasalesmanwhethertheunfamiliarpersononourpropertyisathieforameterreaderandsoon. Thestatusesweassumeoftenvarywiththepeopleweencounterandchangethroughoutlife.Mostofuscanatveryhighspeedassumethestatusesthatvarioussituationsrequire.Muchofsocialinteractionconsistsofidentifyingandselectingamongappropriatestatusesandallowingotherpeopletoassumetheirstatusesinrelationtous.Thismeansthatwefitouractionstothoseofotherpeoplebasedonaconstantmentalprocessofappraisalandinterpretation.Althoughsomeofusfindthetaskmoredifficultthanothersmostofusperformitrathereffortlessly. Statuseshasbeencomparedtoready-madeclothes.Withincertainlimitsthebuyercanchoosestyleandfabric.ButanAmericanisnotfreetochoosethecostumeofaChinesepeasantorthatofaHinduprince.Wemustchoosefromamongtheclothingpresentedbyfitaswellasbyourpocket-boob.Havingmadeachoicefromminoradjustmentswetendtobelimitedtowhatthestoreschoiceamongthemislimited. Inthelastsentenceofthesecondparagraphthepronounitrefersto
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E Manypeoplebelievetheglarefromsnowcausessnowblindnenss.Yetdarkglassesornottheyfindthemselvessufferingfromheadachesandwateringeyesandevensnowblindnesswhenex-posedtoseveralhoursof"snowlight". TheUnitedStatesarmyhasnowdeterminedthatglarefromsnowdoesnotcausesnowblindnessintroopsinasnow-coveredcountry.Ratheraman’seyesfrequentlyfindnothingtofocusoninabroadexpanseofbarrensnow-coveredterrain.Sohisgazecontinuallyshiftsandjumpsbackandforthovertheentirelandscapeinsearchofsomethingtolookat.Findingnothinghourafterhourtheeyesneverstopsearchingandtheeyeballsbecomesoreandtheeyemusclesache.Natureoffsetsthisirritationbyproducingmoreandfluidwhichcoverstheeyeball.Thefluidcoverstheeyeballinincreasingquantityuntilvisionblursthenisobservedandtheresultistotaleventhoughtemporarysnowblindness. Experimentsledthearmytoasimplemethodofovercomingthisproblem.Scoutsaheadofamainbodyoftroopsaretrainedtoshakesnowfromevergreenbushescreatingadottedlineastheycrosscompletelysnow-coveredlandscape.Eventhescoutsthemselvesthrowlightweightdarkcoloredobjectsaheadonwhichtheytoocanfocus.Themenfollowingcanthenseesomething.Theirgazeisarrested.Theireyesfocusonabushandhavingfoundsomethingtoseestopscouringthesnow-blanketedlanscape.Byfocusingtheirattentionononeobjectatatimethemencancrossthesnowwithoutbecominghopelesslysnowblindorlost.Inthiswaytheproblemofcrossingasolidwhiteterrainisovercome. Thescoutsshakesnowfromevergreenbushesinorderto
"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. 19
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 WhichofthefollowingisNOTmentionedasawaytomeasurethetime
—Couldyoudomeafavorandtaketheboxuptothesixthfloor—__________.
A Fromthehealthpointofviewwearelivinginamarvelousage.Weareimmunizedfrombirthagainstmanyofthemostdangerousdiseases.Alargenumberofoncefatalillnessescannowbecuredbymoderndrugsandsurgery.Itisalmostcertainthatonedayremedieswillbefoundforthemoststubbornremainingdiseases.Theexpectationoflifehasincreasedenormously.Butthoughthepossibilityoflivingalongandhappylifeisgreaterthaneverbeforeeverydaywewitnessthein-credibleslaughterofmenwomenandchildrenontheroads.Manversusthemotorcar!Itisanever-endingbattlewhichmanislosing.Thousandsofpeopleovertheworldarekilledorhorriblykilledeachyearandwearequietlysittingbackandlettingithappen. Ithasbeenrightlysaidthatwhenamanissittingbehindasteeringwheelhiscarbecomestheextensionofhispersonality.Thereisnodoubtthatthemotorcaroftenbringsoutaman’sveryworstqualities.Peoplewhoarenormallyquietandpleasantmaybecomeunrecognizablewhentheyarebe-hindasteering-wheel.Theysweartheyareill-manneredandaggressivewillfulastwo-year-oldsandutterlyselfish.Alltheirhiddenfrustrationsdisappointmentsandjealousiesseemtobebroughttothesurfacebytheactofdriving. Thesurprisingthingisthatsocietysmilessobenignlyonthemotoristandseemstocondonehisbehaviour.Everythingisdoneforhisconvenience.Citiesareallowedtobecomealmostuninhabitablebecauseofheavytraffic;townsaremadeuglybyhugecarparks;thecountrysideisdesecratedbyroadnetworks;andthemassannualslaughterbecomesnothingmorethanastatistictobeconvenientlyforgotten. Itishightimeaworldcodewerecreatedtoreducethissenselesswasteofhumanlife.Withregardtodrivingthelawsofsomecountriesarenotoriouslylaxandeventhestrictestarenotstrictenough.Acodewhichwasuniversallyacceptedcouldonlyhaveadramaticallybeneficialeffectontheaccidentrate.Hereareafewexamplesofsomeofthethingsthatmightbedone.Thedrivingtestshouldbestandardizedandmadefarmoredifficultthanitis;allthedriversshouldbemadetotakeatesteverythreeyearsorso;theageatwhichyoungpeopleareallowedtodriveanyvehicleshouldberaisedtoatleast21;allvehiclesshouldbeputthroughstringentannualtestsforsafety.Eventhesmallestamountofalcoholinthebloodcanimpairaperson’sdrivingability.Presentdrinkinganddrivinglawswheretheyexistshouldbemademuchstricter.Maximumandminimumspeedlimitsshouldbeimposedonallroads.GovernmentsshouldlaydownsafetyspecificationsformanufacturersashasbeendoneintheUSA.Alladvertisingstressingpowerandperformanceshouldbebanned.Thesemeasuresmaysoundinordinatelyharsh.Butsurelynothingshouldbe’consideredassevereifitresultsinreducingtheannualtollofhumanlife.Afteralltheworldisforhumanbeingsnotmotorcars. Whatdoestheauthorthinkofsocietytowardmotorists
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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 Thepurposeofthepassageis
E Manypeoplebelievetheglarefromsnowcausessnowblindnenss.Yetdarkglassesornottheyfindthemselvessufferingfromheadachesandwateringeyesandevensnowblindnesswhenex-posedtoseveralhoursof"snowlight". TheUnitedStatesarmyhasnowdeterminedthatglarefromsnowdoesnotcausesnowblindnessintroopsinasnow-coveredcountry.Ratheraman’seyesfrequentlyfindnothingtofocusoninabroadexpanseofbarrensnow-coveredterrain.Sohisgazecontinuallyshiftsandjumpsbackandforthovertheentirelandscapeinsearchofsomethingtolookat.Findingnothinghourafterhourtheeyesneverstopsearchingandtheeyeballsbecomesoreandtheeyemusclesache.Natureoffsetsthisirritationbyproducingmoreandfluidwhichcoverstheeyeball.Thefluidcoverstheeyeballinincreasingquantityuntilvisionblursthenisobservedandtheresultistotaleventhoughtemporarysnowblindness. Experimentsledthearmytoasimplemethodofovercomingthisproblem.Scoutsaheadofamainbodyoftroopsaretrainedtoshakesnowfromevergreenbushescreatingadottedlineastheycrosscompletelysnow-coveredlandscape.Eventhescoutsthemselvesthrowlightweightdarkcoloredobjectsaheadonwhichtheytoocanfocus.Themenfollowingcanthenseesomething.Theirgazeisarrested.Theireyesfocusonabushandhavingfoundsomethingtoseestopscouringthesnow-blanketedlanscape.Byfocusingtheirattentionononeobjectatatimethemencancrossthesnowwithoutbecominghopelesslysnowblindorlost.Inthiswaytheproblemofcrossingasolidwhiteterrainisovercome. Whentheeyesaresoretearsareproducedto
B Treesshouldonlybepruned修剪whenthereisagoodandclearreasonfordoingsoandfortunatelythenumberofsuchreasonsissmall.Pruninginvolvescuttingawayofovergrownandunwantedbranchesandtheinexperiencedgardenercanbeencouragedbythethoughtthatmoredamageresultsfromdoingitunnecessarilythanfromleavingthetreestogrowintheirownways. Firstpruningmaybedonetomakesurethattreeshaveadesiredshapeorsize.Theobjectmaybetogetatreeoftherightheightandatthesametimetohelpthegrowthofsmallsidebrancheswhichwillthickenitsappearanceorgiveitaspecialshape.Secondlypruningmaybedonetomakethetreehealthier.Youmaycutoutdiseasedordeadwoodorbranchesthatarerubbingagainsteachotherandthuscausingwounds.Thehealthofatreemaybeencouragedbyremovingthebranchesthatarelockingupthecentreandsopreventingthefreemovementofair. Oneresultofpruningisthatanopenwouldisleftonthetreeandthisprovidesaneasyentryfordiseasesbutitisawoundthatwillheal愈合.Oftenthereisaracebetweenthehealingandthediseaseastowhetherthetreewillliveordieorthatthereisaperiodwhenthetreeisatrisk.Itshouldbetheaimofeverygardenertoreducetheriskasfaraspossible.Itisessentialtomaketheareawhichhasbeenprunedsmoothandcleanforhealingwillbesloweddownbyroughness.Youshouldallowthecutsurfacetdryforafewhoursandthenpaintitwithoneofthesubstancesavailablefromgardenshopsproducedespeciallyforthispurpose.Pruningisusuallydoneinwinterforthenyoucanseetheshapeofthetreeclearlywithouttheinterference妨碍fromtheleavesanditistooveryunlikelythatthecutsyoumakewillbleed.Ifthisdoeshappenitisofcourseimpossibletopaintthemproperly. Whyisaspecialmaterialpaintedonthetree
—Whydon’twechoosethatroadtosavetime—Thebridgetoit______．
Afooltakesinallthelumberofeverysortthathecomesacrosssothattheknowledgewhichmightbeusefultohimgetscrowdedoutoratbestjumbledupwithalotofotherthingssothathehasdifficultyinlayinghishanduponit.
苏格拉底法又称为
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 Accordingtothepassagecollectingantiqueclocks
"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. 17
合作学习理论认为在班级教学中学生群体的组织形式有三种即
Hedidnotregretsayingwhathedidbutfeltthathe______itdifferently．
Ifyouleavetheclubyouwillnotbe______backin．
Sostartlingwouldhisresultsappeartotheuninitiatethatuntiltheylearnedtheprocessesbywhichhehadarrivedatthemtheymightwellconsiderhimasanecromancer.
B Treesshouldonlybepruned修剪whenthereisagoodandclearreasonfordoingsoandfortunatelythenumberofsuchreasonsissmall.Pruninginvolvescuttingawayofovergrownandunwantedbranchesandtheinexperiencedgardenercanbeencouragedbythethoughtthatmoredamageresultsfromdoingitunnecessarilythanfromleavingthetreestogrowintheirownways. Firstpruningmaybedonetomakesurethattreeshaveadesiredshapeorsize.Theobjectmaybetogetatreeoftherightheightandatthesametimetohelpthegrowthofsmallsidebrancheswhichwillthickenitsappearanceorgiveitaspecialshape.Secondlypruningmaybedonetomakethetreehealthier.Youmaycutoutdiseasedordeadwoodorbranchesthatarerubbingagainsteachotherandthuscausingwounds.Thehealthofatreemaybeencouragedbyremovingthebranchesthatarelockingupthecentreandsopreventingthefreemovementofair. Oneresultofpruningisthatanopenwouldisleftonthetreeandthisprovidesaneasyentryfordiseasesbutitisawoundthatwillheal愈合.Oftenthereisaracebetweenthehealingandthediseaseastowhetherthetreewillliveordieorthatthereisaperiodwhenthetreeisatrisk.Itshouldbetheaimofeverygardenertoreducetheriskasfaraspossible.Itisessentialtomaketheareawhichhasbeenprunedsmoothandcleanforhealingwillbesloweddownbyroughness.Youshouldallowthecutsurfacetdryforafewhoursandthenpaintitwithoneofthesubstancesavailablefromgardenshopsproducedespeciallyforthispurpose.Pruningisusuallydoneinwinterforthenyoucanseetheshapeofthetreeclearlywithouttheinterference妨碍fromtheleavesanditistooveryunlikelythatthecutsyoumakewillbleed.Ifthisdoeshappenitisofcourseimpossibletopaintthemproperly. Whatwastheauthor’spurposewhenwritingthispassage
Becauseofthefinancialcrisisdaysaregone______local5-starhotelscharged6000yuanforonenight．
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