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对全及总体2000个单位进行5%的等距抽样，可以确定( )。
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是将调查总体中各单位按一定标志排列通过选择一个随机起点然后按照某种确定的距离或间隔从 总体中抽取样本
简单抽样
等距抽样
分层抽样
奈曼分层抽样
又称分层随机抽样它是先将总体按一定标准分成各种类型然后根据各类单位数占总体单位数的比重确定从各类型中
随机抽样
类型随机抽样
任意抽样
单纯随机抽样
事先确定总体范围并对总体的每个单位编号再根据随机数表或抽签的方式抽取样本的形式称为
简单随机抽样
等距抽样
分层抽样
整群抽样
按随机原则直接从总体N个单位中抽取n个单位作为样本这种抽样组织形式是
简单随机抽样
类型抽样
等距抽样
整群抽样
在抽样调查中
全及总体是调查对象
抽样总体是调查单位
全及指标是确定的量
抽样指标是随机变量
抽样误差是代表性误差
将调查总体各单位按某一标志排序通过选择一个随机的起点然后按照某种确定的距离或间隔从总体中抽取样本单位
等距抽样
简单随机抽样
整群抽样
多阶段抽样
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B Todaytherearepolicemeneverywherebutinl700Londonhadnopolicemenatall．Afewoldmenusedtoprotectthecitystreetsatnightandtheywerenotpaid． About300yearsa90Londonwasstartingtogetbiggerandmoreandmorepeoplebegantolivethere．Thecitywasverydirtyandmanypeoplewerepoor．Thereweresomanythieveswhostolemoneyinthestreetsthatpeoplestayedintheirhomesasmuchaspossible． Inl750HenryFieldingstartedtopayagroupofpeopletostopthieves．TheywerelikepolicemenandwerecalledBowStreetRunnersbecausetheyworkednearBowStreet． Fiftyyearslatertherewerel20BowStreetRunnersbutLondonhadbecomeverybigandneededmorepolicemen．Soinl829thefirstMetropolitanorLondonPoliceForcewasstartedwith 30000fficers．Mostofthemenworkedonfootbutafewrodehorses．Untill920allthepolicein Londonweremen． TodayLondonpolicearequitewellpaidandforthefewpoliceofficerswhostilltidehorsesthepayisevenbetterthanfortheothers． TheBowStreetRunners．
AboutthreeyearsagoIfeltverylonely．Ididn’tlikemyclassmatesmyparentsoranyoneelse．Myclassmatesdidn’twanttotalk61meandmyparentswerealwayssayingthatotherkidswerebetterthanme．Ithoughtlwasthe62unluckypersonintheworld． OnedayIhadabigfightwithoneofmyclassmates．1wasSOangry63Ihithimintheface．Justatthatmomentaboystoodupand64thefight．Hewasthemonitorofmyclass． Afterthatheoftenhelpedmeandwebecamegood65．WheneverIgotangryorsadhewouldhelp66tocooldown．Mylifebegantochangebecauseoftheboymybestfriend．Wespentalotofinterestingdaystogether．As67goesbyIhavebecomehappierwithpeopleandthings．Andit68thatpeoplearoundmehavechangedtoo．Myparentsdon’tshoutatme69 —moreandmyclassmatesbecomefriendlytome． ButnowIcan’toftenseemybestfriendbecauseheisseriously70andisstayinginhospi．tal．HowImissthedayswhenweweretogether!Ihopehewillbeallrightandcomebacktoschoolsoon． 61．62．63．64．65． 66．67．68．69．70．
请设计一个教案达到以下目的 1．能听懂会说会读单词blowoutacandleacostumeadoorbelltakeoff． 2．能听懂会说会读和会写句型When’syourbirthdayMybirthday’sonWhatwould youlikeasabirthdaypresentI’dlike．．． 3．培养学生运用英语的能力
Onceamanandhiswifeworkedforabusinessman．Therewasabigboxinthebusinessman’Slivingroom．ThebusinessmanpointedattheboxandsaidThere’sonlyonethingyoul6do．Don’topenthebox．Mtersayingthishel7thelivingroom． ThewomansaidtoherhusbandTherel8besomethingexpensiveinthebox．Let’s19itshallwe’’Herhusbandsaidnotoher． Thewomandidn’tgiveupher20．Onedayshedecidedtofindoutwhatwas21it．Herhusbanddidn’tstopher．Sheopenedtheboxandlooked22Shefoundnothingintheboxandtriedhardtocloseit23shefailed． Thateveningthebusinessmancamehomeandfoundtheboxwas24．Hewasveryangryandaskedthewomanandherhusbandtoleavehishome． Buttherewasnothingintheboxthewomansaid．Wehaven’ttakenanything25ThebusinessmanshoutedatthemTheboxisnotimportant．Icannotbelieveyou．1’hat’simportant．
Manyyearsagoapoormangrewanorangetree．51． Onthetreethereweremanyfineoranges．Somedayhefound52． oneofthemwassobigasafootball．Hetookit53． forthekin9．ThekingwasSOhappythathegavethe54． poormanlotsmoney．Whenarichmanheardofit55． hesaidforhimself．I’lltakemygoldcuptothekin956． andhewillgivememuchmoney．Nextdaythekingreceived57． fromthecup．Thekingwasveryfondofthecupandhetold58． therichmanIhaveanorange．It’Sbeautifulthanthecup59． SOIhavedecidedtogiveittoyouastherewardinsteadmoney．60．
C MaLili’sparentsaregoingtogiveabiahdaypartyforher．She’sgoingtobefourteenyearsold．MaLilihasalotoffriends．Theyaregoingtocometotheparty．TheyaregirlsfromMaLili’sschool．Therearetwenty．fiveofthem． MaLili’smotherismakingbirthdaycake8fortheparty．Theyareverynicecakes．MaLilisaystohermotherMumyotlgleverynice．Thankyouforyournicecakes．Herfatherisgoingshopping．Hebuysalotofapplesbananasorangesandpears． It’sfouro’eloekintheafternoon．Noweverythingisready．Thepartybeginsinthirtyminutes． WhoisgoingtogiveMaLiliabirthdayparty
Manyyearsagoapoormangrewanorangetree．51． Onthetreethereweremanyfineoranges．Somedayhefound52． oneofthemwassobigasafootball．Hetookit53． forthekin9．ThekingwasSOhappythathegavethe54． poormanlotsmoney．Whenarichmanheardofit55． hesaidforhimself．I’lltakemygoldcuptothekin956． andhewillgivememuchmoney．Nextdaythekingreceived57． fromthecup．Thekingwasveryfondofthecupandhetold58． therichmanIhaveanorange．It’Sbeautifulthanthecup59． SOIhavedecidedtogiveittoyouastherewardinsteadmoney．60．
AboutthreeyearsagoIfeltverylonely．Ididn’tlikemyclassmatesmyparentsoranyoneelse．Myclassmatesdidn’twanttotalk61meandmyparentswerealwayssayingthatotherkidswerebetterthanme．Ithoughtlwasthe62unluckypersonintheworld． OnedayIhadabigfightwithoneofmyclassmates．1wasSOangry63Ihithimintheface．Justatthatmomentaboystoodupand64thefight．Hewasthemonitorofmyclass． Afterthatheoftenhelpedmeandwebecamegood65．WheneverIgotangryorsadhewouldhelp66tocooldown．Mylifebegantochangebecauseoftheboymybestfriend．Wespentalotofinterestingdaystogether．As67goesbyIhavebecomehappierwithpeopleandthings．Andit68thatpeoplearoundmehavechangedtoo．Myparentsdon’tshoutatme69 —moreandmyclassmatesbecomefriendlytome． ButnowIcan’toftenseemybestfriendbecauseheisseriously70andisstayinginhospi．tal．HowImissthedayswhenweweretogether!Ihopehewillbeallrightandcomebacktoschoolsoon． 61．62．63．64．65． 66．67．68．69．70．
E Aroundtheworldmoreandmorepeoplearetakingpartindangeroussportsandactivities．Ofcourse．therehavealwaysbeenpeoplewhohavelookedforadventures——thosewhohaveclimbedthehighestmountainstraveledintounknownpartsoftheworldorsailedinsmallboatsacrossthegreatestoceans．Nowhowevertherearepeoplewholookforanimmediateexcitementfromariskyactivitywhichmayonlylastafewminutesorevenseconds． 1wouldconsiderbungeejumpingtobeagoodexample．ofsuchanactivity．Youjumpfromahighplaceperhapsabridgeorahot—airballoon200metre8abovethegroundwithanelastic有弹性的ropetiedtoyourankles．Youfallatupt0150kilometresanhouruntiltheropestopsyoufromhittingtheground．Itissaidthatabout2millionpeoplearoundtheworldhavenowtriedbun-geejumpin9．Otheractivitieswhichmostpeoplewouldsayareasriskyasbungeejumpingincludejumpingfromtallbuildinganddivingintotheseafromthetopofhighcliff悬崖． WhydopeopletakepartinsuchactivitiesastheseSomepsychologistssuggestthatitisbecauselifeinmodemsocietieshasbecomesafeandborin9．Notverylongagodiseasescouldnoteasilybecuredandlifewasacontinuousbattleforsurvival生存． Nowadaysaccordingtomanypeoplelifeofferslittleexcitement．Theyliveandworkincomparativelysafeconditionstheybuyfoodinshopsandtherearedoctorsandhospitalstolookafterthemiftheybecomeill．Theanswerforsomeofthesepeopleistolookfordangerinactivitiessuchasbungeejumping． Inbungeejumpingyou．
AboutthreeyearsagoIfeltverylonely．Ididn’tlikemyclassmatesmyparentsoranyoneelse．Myclassmatesdidn’twanttotalk61meandmyparentswerealwayssayingthatotherkidswerebetterthanme．Ithoughtlwasthe62unluckypersonintheworld． OnedayIhadabigfightwithoneofmyclassmates．1wasSOangry63Ihithimintheface．Justatthatmomentaboystoodupand64thefight．Hewasthemonitorofmyclass． Afterthatheoftenhelpedmeandwebecamegood65．WheneverIgotangryorsadhewouldhelp66tocooldown．Mylifebegantochangebecauseoftheboymybestfriend．Wespentalotofinterestingdaystogether．As67goesbyIhavebecomehappierwithpeopleandthings．Andit68thatpeoplearoundmehavechangedtoo．Myparentsdon’tshoutatme69 —moreandmyclassmatesbecomefriendlytome． ButnowIcan’toftenseemybestfriendbecauseheisseriously70andisstayinginhospi．tal．HowImissthedayswhenweweretogether!Ihopehewillbeallrightandcomebacktoschoolsoon． 61．62．63．64．65． 66．67．68．69．70．
Onceamanandhiswifeworkedforabusinessman．Therewasabigboxinthebusinessman’Slivingroom．ThebusinessmanpointedattheboxandsaidThere’sonlyonethingyoul6do．Don’topenthebox．Mtersayingthishel7thelivingroom． ThewomansaidtoherhusbandTherel8besomethingexpensiveinthebox．Let’s19itshallwe’’Herhusbandsaidnotoher． Thewomandidn’tgiveupher20．Onedayshedecidedtofindoutwhatwas21it．Herhusbanddidn’tstopher．Sheopenedtheboxandlooked22Shefoundnothingintheboxandtriedhardtocloseit23shefailed． Thateveningthebusinessmancamehomeandfoundtheboxwas24．Hewasveryangryandaskedthewomanandherhusbandtoleavehishome． Buttherewasnothingintheboxthewomansaid．Wehaven’ttakenanything25ThebusinessmanshoutedatthemTheboxisnotimportant．Icannotbelieveyou．1’hat’simportant．
Manyyearsagoapoormangrewanorangetree．51． Onthetreethereweremanyfineoranges．Somedayhefound52． oneofthemwassobigasafootball．Hetookit53． forthekin9．ThekingwasSOhappythathegavethe54． poormanlotsmoney．Whenarichmanheardofit55． hesaidforhimself．I’lltakemygoldcuptothekin956． andhewillgivememuchmoney．Nextdaythekingreceived57． fromthecup．Thekingwasveryfondofthecupandhetold58． therichmanIhaveanorange．It’Sbeautifulthanthecup59． SOIhavedecidedtogiveittoyouastherewardinsteadmoney．60．
D Koreanculture韩国文化isreallyexcitingrightnOW．TheKoreanWaveissweepingAsiancountriesincludingChinaYoungpeoplearegoingcrazy疯狂的aboutKoreanTVplaysKoreanpopsongstaekwondoandtheKoreanlanguage． TheKoreanWavestartedafewyearsagowiththeTVseriesWinterSonata．Thislovestoryisstillpopular．Peopleespeciallygirlshkethebeautifulstoryandgood—lookingactors演员likeBaeYongJun． InthemusicworldKoreangirlsaremakingthemselvesheardinChina．YoucanoftenfindbigKoreannamesl／keBabyCoxS．E．SandFinkleatthetopoftheChinesemusiccharts排行榜． TheKoreanWavehasalsomakeyoungpeoplewanttotrytheclothesandhairstylesofpopstarstoo．Notonlythat．NowsomegirlsinChinaarehavingplasticsurgery整容tochangethewaytheylook．PeoplesaysomebeautifulKoreanstarshavehadplasticsurgery．Thesestarsdon’tmakeplasticsurgerylookshameful丢面子的. AreallthefacesofbeautifulKoreangirlsnotrealFindoutforyourselfwhenyounextvisit SouthKorea． Theunderlinedsentenceinthefourthparagraphmeans．
C MaLili’sparentsaregoingtogiveabiahdaypartyforher．She’sgoingtobefourteenyearsold．MaLilihasalotoffriends．Theyaregoingtocometotheparty．TheyaregirlsfromMaLili’sschool．Therearetwenty．fiveofthem． MaLili’smotherismakingbirthdaycake8fortheparty．Theyareverynicecakes．MaLilisaystohermotherMumyotlgleverynice．Thankyouforyournicecakes．Herfatherisgoingshopping．Hebuysalotofapplesbananasorangesandpears． It’sfouro’eloekintheafternoon．Noweverythingisready．Thepartybeginsinthirtyminutes． Whattimedoesthepartybegin
D Koreanculture韩国文化isreallyexcitingrightnOW．TheKoreanWaveissweepingAsiancountriesincludingChinaYoungpeoplearegoingcrazy疯狂的aboutKoreanTVplaysKoreanpopsongstaekwondoandtheKoreanlanguage． TheKoreanWavestartedafewyearsagowiththeTVseriesWinterSonata．Thislovestoryisstillpopular．Peopleespeciallygirlshkethebeautifulstoryandgood—lookingactors演员likeBaeYongJun． InthemusicworldKoreangirlsaremakingthemselvesheardinChina．YoucanoftenfindbigKoreannamesl／keBabyCoxS．E．SandFinkleatthetopoftheChinesemusiccharts排行榜． TheKoreanWavehasalsomakeyoungpeoplewanttotrytheclothesandhairstylesofpopstarstoo．Notonlythat．NowsomegirlsinChinaarehavingplasticsurgery整容tochangethewaytheylook．PeoplesaysomebeautifulKoreanstarshavehadplasticsurgery．Thesestarsdon’tmakeplasticsurgerylookshameful丢面子的. AreallthefacesofbeautifulKoreangirlsnotrealFindoutforyourselfwhenyounextvisit SouthKorea． isthestartoftheKoreanWave．
Onceamanandhiswifeworkedforabusinessman．Therewasabigboxinthebusinessman’Slivingroom．ThebusinessmanpointedattheboxandsaidThere’sonlyonethingyoul6do．Don’topenthebox．Mtersayingthishel7thelivingroom． ThewomansaidtoherhusbandTherel8besomethingexpensiveinthebox．Let’s19itshallwe’’Herhusbandsaidnotoher． Thewomandidn’tgiveupher20．Onedayshedecidedtofindoutwhatwas21it．Herhusbanddidn’tstopher．Sheopenedtheboxandlooked22Shefoundnothingintheboxandtriedhardtocloseit23shefailed． Thateveningthebusinessmancamehomeandfoundtheboxwas24．Hewasveryangryandaskedthewomanandherhusbandtoleavehishome． Buttherewasnothingintheboxthewomansaid．Wehaven’ttakenanything25ThebusinessmanshoutedatthemTheboxisnotimportant．Icannotbelieveyou．1’hat’simportant．
A YearsagoIlivedinabuildinginalargecity．Thebuildin9’Snextdoorwasonlyafewfeetawayfrommine．TherewasawomanwholivedtherewhomIhadnevermetyetIcouldseeherseatedbyherwindoweachafternoonsewingorreadin9． AfterseveralmonthshadgonebyIbegantonoticethatherwindowwasdirty．Everythingwasunclearthroughthedirtywindow．1wouldsaytomyselflwonderwhythatwomandoesn’twashherwindow．Itreallylooksterrible． OnebrightmorningIdecidedtocleanmyflatincludingwashingthewindowontheinside． LateintheafternoonwhenIfinishedthecleanin9．Isatdownbythewindowwithacupofcoffeeforarest．Whatasurprise!Acrossthewaythewomansittingbyherwindowwasclearlyvisible．Herwindowwasclean! Thenitdawnedonme．Ihadbeencriticizing批评herdirtywindowbutallthetimelwaswatchinghersthroughmyowndirtywindow． Thatwasquiteanimportantlessonforme．HowoftenhadIlookedatandcriticizedothersthroughthedirtywindowofmyheartthroughmyownshortcomings Sincethenwheneverlwantedtojudge评判someoneIaskedmyselffirstAmIlookingathimthroughmyowndirtywindowThenItrytocleanthewindowofmyownworldsothatImayseetheworldaboutmemoreclearly． Fromthepassagewecanlearn．
E Aroundtheworldmoreandmorepeoplearetakingpartindangeroussportsandactivities．Ofcourse．therehavealwaysbeenpeoplewhohavelookedforadventures——thosewhohaveclimbedthehighestmountainstraveledintounknownpartsoftheworldorsailedinsmallboatsacrossthegreatestoceans．Nowhowevertherearepeoplewholookforanimmediateexcitementfromariskyactivitywhichmayonlylastafewminutesorevenseconds． 1wouldconsiderbungeejumpingtobeagoodexample．ofsuchanactivity．Youjumpfromahighplaceperhapsabridgeorahot—airballoon200metre8abovethegroundwithanelastic有弹性的ropetiedtoyourankles．Youfallatupt0150kilometresanhouruntiltheropestopsyoufromhittingtheground．Itissaidthatabout2millionpeoplearoundtheworldhavenowtriedbun-geejumpin9．Otheractivitieswhichmostpeoplewouldsayareasriskyasbungeejumpingincludejumpingfromtallbuildinganddivingintotheseafromthetopofhighcliff悬崖． WhydopeopletakepartinsuchactivitiesastheseSomepsychologistssuggestthatitisbecauselifeinmodemsocietieshasbecomesafeandborin9．Notverylongagodiseasescouldnoteasilybecuredandlifewasacontinuousbattleforsurvival生存． Nowadaysaccordingtomanypeoplelifeofferslittleexcitement．Theyliveandworkincomparativelysafeconditionstheybuyfoodinshopsandtherearedoctorsandhospitalstolookafterthemiftheybecomeill．Theanswerforsomeofthesepeopleistolookfordangerinactivitiessuchasbungeejumping． Thewriterofthetexthasaattitudetowardsdangeroussports．
Manyyearsagoapoormangrewanorangetree．51． Onthetreethereweremanyfineoranges．Somedayhefound52． oneofthemwassobigasafootball．Hetookit53． forthekin9．ThekingwasSOhappythathegavethe54． poormanlotsmoney．Whenarichmanheardofit55． hesaidforhimself．I’lltakemygoldcuptothekin956． andhewillgivememuchmoney．Nextdaythekingreceived57． fromthecup．Thekingwasveryfondofthecupandhetold58． therichmanIhaveanorange．It’Sbeautifulthanthecup59． SOIhavedecidedtogiveittoyouastherewardinsteadmoney．60．
A YearsagoIlivedinabuildinginalargecity．Thebuildin9’Snextdoorwasonlyafewfeetawayfrommine．TherewasawomanwholivedtherewhomIhadnevermetyetIcouldseeherseatedbyherwindoweachafternoonsewingorreadin9． AfterseveralmonthshadgonebyIbegantonoticethatherwindowwasdirty．Everythingwasunclearthroughthedirtywindow．1wouldsaytomyselflwonderwhythatwomandoesn’twashherwindow．Itreallylooksterrible． OnebrightmorningIdecidedtocleanmyflatincludingwashingthewindowontheinside． LateintheafternoonwhenIfinishedthecleanin9．Isatdownbythewindowwithacupofcoffeeforarest．Whatasurprise!Acrossthewaythewomansittingbyherwindowwasclearlyvisible．Herwindowwasclean! Thenitdawnedonme．Ihadbeencriticizing批评herdirtywindowbutallthetimelwaswatchinghersthroughmyowndirtywindow． Thatwasquiteanimportantlessonforme．HowoftenhadIlookedatandcriticizedothersthroughthedirtywindowofmyheartthroughmyownshortcomings Sincethenwheneverlwantedtojudge评判someoneIaskedmyselffirstAmIlookingathimthroughmyowndirtywindowThenItrytocleanthewindowofmyownworldsothatImayseetheworldaboutmemoreclearly． Thewritercouldn’tseeeverythingclearlythroughthewindowbecause．
三角形的面积一定它的底和高
Onceamanandhiswifeworkedforabusinessman．Therewasabigboxinthebusinessman’Slivingroom．ThebusinessmanpointedattheboxandsaidThere’sonlyonethingyoul6do．Don’topenthebox．Mtersayingthishel7thelivingroom． ThewomansaidtoherhusbandTherel8besomethingexpensiveinthebox．Let’s19itshallwe’’Herhusbandsaidnotoher． Thewomandidn’tgiveupher20．Onedayshedecidedtofindoutwhatwas21it．Herhusbanddidn’tstopher．Sheopenedtheboxandlooked22Shefoundnothingintheboxandtriedhardtocloseit23shefailed． Thateveningthebusinessmancamehomeandfoundtheboxwas24．Hewasveryangryandaskedthewomanandherhusbandtoleavehishome． Buttherewasnothingintheboxthewomansaid．Wehaven’ttakenanything25ThebusinessmanshoutedatthemTheboxisnotimportant．Icannotbelieveyou．1’hat’simportant．
AboutthreeyearsagoIfeltverylonely．Ididn’tlikemyclassmatesmyparentsoranyoneelse．Myclassmatesdidn’twanttotalk61meandmyparentswerealwayssayingthatotherkidswerebetterthanme．Ithoughtlwasthe62unluckypersonintheworld． OnedayIhadabigfightwithoneofmyclassmates．1wasSOangry63Ihithimintheface．Justatthatmomentaboystoodupand64thefight．Hewasthemonitorofmyclass． Afterthatheoftenhelpedmeandwebecamegood65．WheneverIgotangryorsadhewouldhelp66tocooldown．Mylifebegantochangebecauseoftheboymybestfriend．Wespentalotofinterestingdaystogether．As67goesbyIhavebecomehappierwithpeopleandthings．Andit68thatpeoplearoundmehavechangedtoo．Myparentsdon’tshoutatme69 —moreandmyclassmatesbecomefriendlytome． ButnowIcan’toftenseemybestfriendbecauseheisseriously70andisstayinginhospi．tal．HowImissthedayswhenweweretogether!Ihopehewillbeallrightandcomebacktoschoolsoon． 61．62．63．64．65． 66．67．68．69．70．
C MaLili’sparentsaregoingtogiveabiahdaypartyforher．She’sgoingtobefourteenyearsold．MaLilihasalotoffriends．Theyaregoingtocometotheparty．TheyaregirlsfromMaLili’sschool．Therearetwenty．fiveofthem． MaLili’smotherismakingbirthdaycake8fortheparty．Theyareverynicecakes．MaLilisaystohermotherMumyotlgleverynice．Thankyouforyournicecakes．Herfatherisgoingshopping．Hebuysalotofapplesbananasorangesandpears． It’sfouro’eloekintheafternoon．Noweverythingisready．Thepartybeginsinthirtyminutes． Hermotherforherparty．
B Todaytherearepolicemeneverywherebutinl700Londonhadnopolicemenatall．Afewoldmenusedtoprotectthecitystreetsatnightandtheywerenotpaid． About300yearsa90Londonwasstartingtogetbiggerandmoreandmorepeoplebegantolivethere．Thecitywasverydirtyandmanypeoplewerepoor．Thereweresomanythieveswhostolemoneyinthestreetsthatpeoplestayedintheirhomesasmuchaspossible． Inl750HenryFieldingstartedtopayagroupofpeopletostopthieves．TheywerelikepolicemenandwerecalledBowStreetRunnersbecausetheyworkednearBowStreet． Fiftyyearslatertherewerel20BowStreetRunnersbutLondonhadbecomeverybigandneededmorepolicemen．Soinl829thefirstMetropolitanorLondonPoliceForcewasstartedwith 30000fficers．Mostofthemenworkedonfootbutafewrodehorses．Untill920allthepolicein Londonweremen． TodayLondonpolicearequitewellpaidandforthefewpoliceofficerswhostilltidehorsesthepayisevenbetterthanfortheothers． About300yearsa90manypeople．
AboutthreeyearsagoIfeltverylonely．Ididn’tlikemyclassmatesmyparentsoranyoneelse．Myclassmatesdidn’twanttotalk61meandmyparentswerealwayssayingthatotherkidswerebetterthanme．Ithoughtlwasthe62unluckypersonintheworld． OnedayIhadabigfightwithoneofmyclassmates．1wasSOangry63Ihithimintheface．Justatthatmomentaboystoodupand64thefight．Hewasthemonitorofmyclass． Afterthatheoftenhelpedmeandwebecamegood65．WheneverIgotangryorsadhewouldhelp66tocooldown．Mylifebegantochangebecauseoftheboymybestfriend．Wespentalotofinterestingdaystogether．As67goesbyIhavebecomehappierwithpeopleandthings．Andit68thatpeoplearoundmehavechangedtoo．Myparentsdon’tshoutatme69 —moreandmyclassmatesbecomefriendlytome． ButnowIcan’toftenseemybestfriendbecauseheisseriously70andisstayinginhospi．tal．HowImissthedayswhenweweretogether!Ihopehewillbeallrightandcomebacktoschoolsoon． 61．62．63．64．65． 66．67．68．69．70．
已知ab为实数则下列各式中一定是正值的是
E Aroundtheworldmoreandmorepeoplearetakingpartindangeroussportsandactivities．Ofcourse．therehavealwaysbeenpeoplewhohavelookedforadventures——thosewhohaveclimbedthehighestmountainstraveledintounknownpartsoftheworldorsailedinsmallboatsacrossthegreatestoceans．Nowhowevertherearepeoplewholookforanimmediateexcitementfromariskyactivitywhichmayonlylastafewminutesorevenseconds． 1wouldconsiderbungeejumpingtobeagoodexample．ofsuchanactivity．Youjumpfromahighplaceperhapsabridgeorahot—airballoon200metre8abovethegroundwithanelastic有弹性的ropetiedtoyourankles．Youfallatupt0150kilometresanhouruntiltheropestopsyoufromhittingtheground．Itissaidthatabout2millionpeoplearoundtheworldhavenowtriedbun-geejumpin9．Otheractivitieswhichmostpeoplewouldsayareasriskyasbungeejumpingincludejumpingfromtallbuildinganddivingintotheseafromthetopofhighcliff悬崖． WhydopeopletakepartinsuchactivitiesastheseSomepsychologistssuggestthatitisbecauselifeinmodemsocietieshasbecomesafeandborin9．Notverylongagodiseasescouldnoteasilybecuredandlifewasacontinuousbattleforsurvival生存． Nowadaysaccordingtomanypeoplelifeofferslittleexcitement．Theyliveandworkincomparativelysafeconditionstheybuyfoodinshopsandtherearedoctorsandhospitalstolookafterthemiftheybecomeill．Theanswerforsomeofthesepeopleistolookfordangerinactivitiessuchasbungeejumping． Thebesttitleforthetextis．
Manyyearsagoapoormangrewanorangetree．51． Onthetreethereweremanyfineoranges．Somedayhefound52． oneofthemwassobigasafootball．Hetookit53． forthekin9．ThekingwasSOhappythathegavethe54． poormanlotsmoney．Whenarichmanheardofit55． hesaidforhimself．I’lltakemygoldcuptothekin956． andhewillgivememuchmoney．Nextdaythekingreceived57． fromthecup．Thekingwasveryfondofthecupandhetold58． therichmanIhaveanorange．It’Sbeautifulthanthecup59． SOIhavedecidedtogiveittoyouastherewardinsteadmoney．60．
A YearsagoIlivedinabuildinginalargecity．Thebuildin9’Snextdoorwasonlyafewfeetawayfrommine．TherewasawomanwholivedtherewhomIhadnevermetyetIcouldseeherseatedbyherwindoweachafternoonsewingorreadin9． AfterseveralmonthshadgonebyIbegantonoticethatherwindowwasdirty．Everythingwasunclearthroughthedirtywindow．1wouldsaytomyselflwonderwhythatwomandoesn’twashherwindow．Itreallylooksterrible． OnebrightmorningIdecidedtocleanmyflatincludingwashingthewindowontheinside． LateintheafternoonwhenIfinishedthecleanin9．Isatdownbythewindowwithacupofcoffeeforarest．Whatasurprise!Acrossthewaythewomansittingbyherwindowwasclearlyvisible．Herwindowwasclean! Thenitdawnedonme．Ihadbeencriticizing批评herdirtywindowbutallthetimelwaswatchinghersthroughmyowndirtywindow． Thatwasquiteanimportantlessonforme．HowoftenhadIlookedatandcriticizedothersthroughthedirtywindowofmyheartthroughmyownshortcomings Sincethenwheneverlwantedtojudge评判someoneIaskedmyselffirstAmIlookingathimthroughmyowndirtywindowThenItrytocleanthewindowofmyownworldsothatImayseetheworldaboutmemoreclearly． Itdawnedonme’’probablymeans．
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