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基因工程中可以通过PCR技术扩增目的基因．回答下列问题． （1）基因工程中所用的目的基因可以人工合成，也可以从基因文库中获得．基因文库包括 和 ． （2）生物体细胞内的DNA复制开始时，...
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高三下学期生物《》真题及答案
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下列获取目的基因的方法中需要模板链的是①从基因组文库中获取目的基因②利用PCR技术扩增目的基因③反转
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在基因工程的基本操作程序中目的基因的获取的途径不包括
从基因文库中获取目的基因
利用PCR技术扩增目的基因
人工合成目的基因
利用DNA分子杂交技术，获取目的基因
下列获取目的基因的方法中需要模板链的是①从细胞中获取目的基因②利用PCR技术扩增目的基因③反转录法④
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24-D作为除草剂在农田中大量使用研究认为它是某种淋巴癌的致病因子为降低24-D的危害科研人员通过基
随着生物科学技术的发展生物工程技术得到了越来越广泛的应用回答下列相关问题1科学家利用基因工程技术获得
在基因工程中把选出的目的基因共1000个脱氧核苷酸其中腺嘌呤脱氧核苷酸230个放入PCR扩增仪中扩增
640
8100
4050
8640
依据基因工程技术和细胞工程有关原理回答下列问题获取目的基因途径有
下列不属于基因工程中获取目的基因的方法的是
利用DNA合成仪人工直接进行合成
利用PCR技术扩增实现大量生产
利用限制酶在受体细胞中获得
从基因文库中获取
PCR技术是基因工程中获得外源基因的一个有效手段该项技术就是在体外通过酶促反应成百万倍地扩增一段目的
限制性内切酶
DNA连接酶
解旋酶
DNA聚合酶
生物学家通过基因工程培育出了能够通过乳房生物反应器生产人的血清蛋白在获得目的基因的过程中PCR技术相
下图表示科学家通过基因工程培育抗虫棉时从苏云金芽孢杆菌中提取抗虫基因放入棉花细胞中与棉花的DNA分子
下列获取目的基因的方法中需要模板的是①从基因组文库中获取目的基因②利用PCR技术扩增目的基因③构建c
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下列获取目的基因的方法中需要模板链是
从基因文库中获取目的基因
利用PCR技术扩增目的基因
反转录法
通过DNA合成仪利用化学方法人工合成
在基因工程的基本操作程序中目的基因的获取途径不包括
从基因文库中获取目的基因
利用PCR技术扩增目的基因
人工合成目的基因
利用DNA分子杂交技术，获取目的基因
研究结果显示寨卡病毒一种RNA病毒的解旋酶是一种具有驱动能力的马达蛋白其通过水解三磷酸核苷将化学能转
基因工程中可以通过PCR技术扩增目的基因．回答下列问题．1基因工程中所用的目的基因可以人工合成也可以
在基因工程的操作步骤中未发生碱基互补配对的是
PCR技术扩增目的基因
基因表达载体的构建
将目的基因导入受体细胞
目的基因的检测与鉴定
在基因工程的基本操作程序中目的基因获取的途径不包括
从基因文库中获取目的基因
利用PCR技术扩增目的基因
人工合成目的基因
利用DNA分子杂交技术，获取目的基因
下列获取目的基因的方法中需要模板链的是①从基因文库中获取目的基因②利用PCR技术扩增目的基因③反转录
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以下有关基因工程的叙述正确的是
利用PCR技术可以大量扩增目的基因
目的基因导人受体细胞最常用的方法是农杆菌转化法
只能用一种限制酶分别切割运载体和目的基因，便于两者连接
利用运载体上标记基因的相关特性就可检测出目的基因已导入受体细胞并成功表达
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25分假设你是李华你班来自美国的交流学生Arthur患病住院已有三周请你用英文给他写封信主要内容包括 1.询问病情表示关切 2.介绍班级近期活动学习等情况 3.表达祝愿. 注意1.词数100左右 2.可适当增加细节以使行文连贯 DearArthur Bestwishes! Yourstruly LiHua.
函数的自变量x的取值范围是
先化简再求值其中a=2019
10分Asweknoweveryonecanmakemistakesbutdon'tworryaboutit.Thefollowingiswhatweshoulddowhenwemakemistakes. Justadmitit.Don'tthinkthatourmistakesarecausedbyothers.1Do'tblameotherpeopleanddon'tcheatourselveseither. 2Inordertostoptheproblemfromgettingworseweshouldactquicklytosolveit.Ifwedon'tactanddealwiththeproblemquicklyit'llonlymakeusfeelmorestressed.Alsoitisnecessarytomakeaplanofactionandcorrctthemistakeaccordingtoit.3. 4ThosewhohavemadethemostmistakescangetanAfortheyaretheoneswhohavelearnedthemost.Themorewelearnfromourmistakestheclevererweare. 5Whatcausedustomakethemistake?Howcanweavoidmakingthesamemistakeinthefuture?Whenweactwithamethodtogetaoodresultdoitthatwaynexttime.Ifwedon'tweshouldstopthinkaboutitchangeitandtryagain. A.Realizethatmakingmistakesisthebestwaytolearn. B.Don'tbeafraidoffailure. C.Bebraveandfacethefactthatwehavemadethemistakes. D.Solveitatonce. E.Sobeawayfromstress. F.Sodecidequicklyandact. G.Thinkaboutwhatwecanlearnfromourmistakes. 1. 2. 3. 4. 5.
计算π+20=
如图在平面直角坐标系中菱形ABCD的顶点C与原点O重合点B在y轴的正半轴上点A在函数k＞0x＞0的图象上点D的坐标为43． 1求k的值 2将点D沿x轴正方向平移得到点D'当点D'在函数k＞0x＞0的图象上时求DD'的长．
8分Whydomendieearlierthanwomen?Thelatestresearchmakesitknownthatthereasoncouldbethatmen'sheartsgointorapiddeclinewhentheyreachmiddleage. Thelargeststudyoftheeffectsofageingonthehearthasfoundthatwomen'slongevitymaybelinkedtothefactthattheirheartsdonotlosetheirpumpingpowerwithage. Wehavefoundthatthepowerofthemaleheartfallsby20﹣25percentbetween18and70yearsofagesaidtheheadofthestudyDavidGoldspinkofliverpooljohnmooresuniversityintheUK. Withinthehearttherearemillionsofcellsthatenableittobeat.betweentheageof20and70one﹣thirdofthosecellsdieandarenotreplacedinmensaidGoldspink.thisispartoftheageingprocess. Whatsurprisesscientistsisthatthefemaleheartseesverylittlelossofthesecells.Ahealthy70﹣year﹣oldwoman'sheartcouldperformalmostaswellasa20﹣year﹣oldone's. ThisgenderdifferencemightjustexplainwhywomenlivelongerthanmensaidGoldspink.Theystudiedmorethan250healthymenandwomenbetweentheagesof18and80focusingonhealthypersonstoremovetheconfusinginfluenceofdisease.TheteamhasyettofindwhyageingtakesagreaterlossonthemaleheartsaidGoldspink. Thegoodnewsisthatmencanimprovethehealthoftheirheartwithregularexercise.goldspinkstressedthatwomenalsoneedregularexercisetopreventtheirlegmusclesbecomingsmallerandweakerastheyage. 1.Thetextmainlytalksabout. A.men'sheartcells B.women'sageingprocess C.thegenderdifference D.heartsandlonglife 2.AccordingtothetexttheUKscientistshaveknownthat. A.womenhavemorecellsthanmenwhentheyareborn B.womencanreplacethecellsthatenablethehearttobeat C.thefemaleheartlosesfewofthecellswithage D.womenneverlosetheirpumpingpowerwithage 3.Ifyouwanttolivelongeryoushould. A.enableyourhearttobeatmuchfaster B.findoutthereasonforageing C.exerciseregularlytokeepyourhearthealthy D.preventyourcellsfrombeinglost 4.Wecanknowfromthepassagethat. A.thereasonwhyageingtakesagreaterlossonthemalehearthasbeenfoundout B.scientistsareonthewaytofindingoutwhythemaleheartlosesmoreofthecells C.theteamhasdonesomethingtopreventthemalefromsufferingthegreaterloss D.womenover70couldlosemoreheartcellsthanthoseattheageof20
如图E是菱形ABCD的对角线BD上一点过点E作EF⊥BC于点F．若EF=4则点E到边AB的距离为
如图表示的一些物质或概念间的从属关系中不正确的是
已知y是x的函数自变量x的取值范围为x≥0下表是y与x的几组对应值 小明根据学习函数的经验利用上述表格所反映出的y与x之间的变化规律对该函数的图象与性质进行了探究．下面是小明的探究过程请补充完整 1如图在平面直角坐标系中描出了以上表中各对对应值为坐标的点根据描出的点画出该函数的图象． 2根据画出的函数图象填空． ①该函数图象与x轴的交点坐标为 ②直接写出该函数的一条性质．
【问题情境】在综合实践课上同学们以“图形的平移”为主题开展数学活动如图①先将一张长为4宽为3的矩形纸片沿对角线剪开拼成如图所示的四边形ABCDAD=3BD=4则拼得的四边形ABCD的周长是 【操作发现】将图①中的△ABE沿着射线DB方向平移连结ADBCAFCE如图②．当△ABE的平移距离是BE的长度时求四边形AECF的周长． 【操作探究】将图②中的△ABE继续沿着射线DB方向平移其它条件不变当四边形ABCD是菱形时将四边形ABCD沿对角线剪开用得到的四个三角形拼成与其面积相等的矩形直接写出所有可能拼成的矩形周长．
小敏不慎将一块平行四边形玻璃打碎成如图的四块为了能在商店配到一块与原来相同的平行四边形玻璃他带了两块碎玻璃其编号应该是
10分假如英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏词符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下面划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. IwasusedtousetheInternetmainlyforgames.Ittakesmyfriendsandmelongtimetoplaygames.SoIdidpooratschool.AndnowIusetheInternetforanythingIneedtohelpmewithmyschoolworkinanymoment.Iusetheonlinedictionariesencyclopediasandmagazines.It'sgreatbecauseIcandownloadpicturesandarticlesanduseitwithmyhomeworks.BesidesIuseittokeepup﹣to﹣datewitheventswherehappenaroundtheworld.It'ssuchhelpfulthatI'mgettingbettergradesnow.
如图在正方形ABCD中点PQ在对角线BD上分别过点PQ作边CD的平行线交BC于点EH作边AD的平行线交AB于点FG．若AB=2则图中阴影部分图形的面积和为
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除去如表物质中所含杂质括号内为杂质选用的试剂或分离方法正确的是
8分ThetermRenaissanceManmeanssomeonewhoisgoodateverything.LeonardoisconsideredtobethebestexampleofRenaissancemen. LeonardodaVinciisregardedasoneofthegreatestartistsinhistory.Leonardowasexcellentinmanyareasincludingdrawingpaintingandsculptureetc.Althoughwedon'thavealotofhispaintingstodayonlyabout15ofhispaintingsarestillaroundheisprobablymostfamousforhispaintingsandalsoachievedgreatfameduringhisowntimeduetohispaintings.TwoofthemostfamousintheworldincludeMonaLisaandTheLastSupper.UnlikesomeartistsLeonardowasveryfamousforhispaintingswhilehewasstillalive. Leonardo'sdrawingsarealsoquiteimpressive.Hewouldkeepjournalsfullofdrawingsoftenofdifferentsubjectsthathewasstudying.OnefamousdrawingisVitruvianMan.It'sapictureofamanwhohasperfectproportion比例basedonthenotesfromtheRomanarchitectVitruvius.Otherfamousdrawingsincludeadesignforaflyingmachineandaselfportrait画像. ManyofdaVinci'sdrawingsandjournalsweremadeinhispursuit追求ofscientificknowledgeandinventionsinwhichhealsomadegreatachievements.Hisjournalswerefilledwithover13000pagesofhisobservationsoftheworld.Hedrewpicturesanddesignsofhelicopterswarmachinesmusicalinstrumentsandpartsofhumanbeings.Healsohadastronginterestinhorsesaswellascows﹣frogsmonkeysandotheranimals. 1.HowwasLeonardodifferentfromsomeotherartists? A.Hewasfamouswhenhewasalive. B.Hewasn'tknownuntilhedied. C.Onlytwoofhispaintingsarestillaround. D.Hisstyleofpaintingisunique. 2.Whatdoestheunderlinedwordjournalsmean? A.Dailyorweeklynewspapers. B.Albumsofdifferentpeopleandobjects. C.Writtenrecordsofeverydaythings. D.Magazineskeptforfutureuse. 3.WhatcanweknowaboutVitruvianManfromParagraph3? A.It'sapictureofLeonardohimself. B.Itwasdrawnwiththefigureatpresent. C.ItwasnotsofamousasLeonardo'sotherpaintings. D.ItwasdrawnaccordingtowhatVirtuviushadwritten. 4.Whichisthebesttitleforthepassage? A.RenaissanceMan B.LeonardodaVinci C.FamousDrawings D.MonaLisaandTheLastSupper
15分Everyoneneedstoknowhowtopreventafire.Itisalsoimportanttoknowwhattodowhenit1breakout. Everyyearover11000people2killorinjuredinhousefires.Thesefirescouldhavebeenavoided.Smokerswhoare3carecauseabout200deathsandover6000fires.Morethanofthose4dieinfiresarepoisonedorharmedbysmoke. Iffirehappensdonotattempttofightthefireunlessitissmall.Tryputtingoutasmallfirewithwater.If5firehasspreadoriftheflamesaremorethan20incheshighshutthedooronitwarneveryoneelseinthebuildingandtellthemtogetout.Youshouldleaveanddial911forthefiredepartment. Before6gointoaroomcheckthedoor.Ifthehandleorthedoorishotdonotopenit!Insteadputclothingorawettowelatthebottomofittokeepsmokeout.Ifthedoorisnothotopenit7slow.Ifthereisarushofsmokeheatcloseitagainandshouttowarn8otherinside. NowopenthewindowandshoutFire!.Seewhetheryoucandropsafelytotheground.Usethis9yourescapecourseifyoucan.Ifyouarenotongroundlevelbreakyourfallbypushingamatoutfirst.Loweryourselfatarm's10longbeforedropping.Onceoutsidestayoutoutsideandmakesurethefiredepartmentiscalled. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
8分I'vebeenquitebusyplanningmyholidaywithmyolderbrotherColinafewweeksbeforehegoestouniversity.Wellnowwe'rereadytogo!We'regoingtovisitsomanyexcitingplacesanddolotsofastonishingthings.WewillgotoAfricafirst. WewillleaveLondonon15thJulyandwe'llbeflyingtoMorocco.We'regoingtotravelthroughtheSaharaDesert.We'llbetravelingbycamelwithlocalguidescampingintentsandsleepingonthegroundinourbigthicksleepingbags.I'llbringatorchwithmesothatI'llbeabletoseebeautifulstarsonclearnightsinthedark.I'llhavetositonacamelforalmostaweek﹣howuncomfortable!Ihopemycamellikesme! Afterthatwe'vegoingtotraveldowntheRiverNile.We'llstartatLakeVictoriawherewe'llgowhite﹣waterraftingwhichisquitedangerousbutveryexciting!Wehavetowearspecialclothingahelmetandalifejacketjustincasetheraftgetsturnedupsidedownorsinks.Thenwe'regoingonatriptoseewildanimalsinKenya.Sincewe'llbewalkingeverydayforalmosttwoweeksI'llneedtobuyalargestronglightbackpacktocarrymysuppliesoffoodandwater.Duringthedaywe'llwalkacrossthelandfollowing.thefootprintsofbiganimalssuchaselephantslionsandgiraffes.We'lltrytogetascloseaspossibletotheanimalseventhoughthey'redangeroussothatIcantakesomereallygoodphotos.Butdon'tworryaboutme﹣ourguideswillhavegunswiththem. Atlastwe'llbemovingontoTanzaniawherewe'regoingtoclimbMountKilimanjaro.TheAfricanpartofourtripwilltakeaboutfourweeks.Thenwe'regoingtotheHimalayas. 1.WhatcanweknowaboutColinaccordingtoParagraph1? A.Heisnotso.excitedaboutthejourney. B.He'llgotouniversityafterthetrip. C.Heusuallytravelsinsummer. D.Hedidn'twanttogotoAfrica. 2.WhatdoestheunderlinedwordthatinParagraph3referto? A.GoingdowntheRiverNile. B.WalkingthroughMorocco. C.Watchingstarsatnight. D.TravelingintheSaharaDesert. 3.Whatkindofholidaydoestheauthorenjoyaccordingtothetext? A.Relaxingholidays. B.Adventureholidays. C.Culturalholidays. D.Uncomfortableholidays. 4.What'sthepurposeoftheauthorinwritingthispassage? A.Toentertainreaders. B.Topersuadereaders. C.Toinformreaders. D.Towarnreaders.
30分ThedayIhadbeenafraidofinsixweekshadfinallyarrived﹣﹣﹣TheLeagueFinalsforthe4x400metersrelay.Thethoughtofracingother6thgradersfromdifferentschools1me.ItalsoworriedmethatIwasrunningthirdlegandmywholeteamwas2metocatchupwith3teamslikeMillerandCupertinowhoseteammembershad4trainers. EverywhereI5Iseeother6thgradeteamshandingouttheirbatons接力棒practisingandrunningatfullspeedwhenthebatonreachestheir6.Itmakesmyteam7melooklikeabunchofamateurs业余爱好.Butitwastoolateto8now.Iwasgoingtorunnomatter9. To10mynervesIturnedaroundandwenttositnexttomybestfriendAlisonhopingthatshewouldgivemesome11.HoweverwhenIsatdownnexttoherIknewAlisonwasevenmore12thanme.Shewasrocking13andshewas14likeasnowmaninthesun. So15havinghercomfortmeItoldherthatshewoulddowellandthatshewould16everygirlintherace.IcomfortedherwiththesewordsagainandagainnotrealizingIwasnotjusthelpingAlisonbutalsohelping17. Iknew18ourteamwasnotthebestwewouldgiveitourbestshot.Ikeptthatinmy19andwhenmy20torunfinallycameIwasn'tsosacredanymore. 1.A.excited B.worried C.disappointed D.interested 2.A.speakingabout B.dependingon C.takingup D.gettingonwith 3.A.connected B.unique C.undefeated D.creative 4.A.strange B.handsome C.common D.personal 5.A.look B.run C.study D.fancy 6.A.space B.hand C.purpose D.destination 7.A.exactly B.unfortunately C.especially D.except 8.A.tryout B.takepart C.turnback D.putup 9.A.where B.when C.which D.what 10.A.calm B.arrange C.guide D.pack 11.A.effect B.impression C.comfort D.Entertainment 12.A.unclear B.responsible C.realistic D.nervous 13.A.atatime B.fullofjoy C.inacircle D.backandforth 14.A.shining B.sweating C.performing D.racing 15.A.insteadof B.aswellas C.apartfrom D.alongwith 16.A.attack B.promote C.rediscover D.beat 17.A.myself B.myteam C.others D.herteam 18.A.evenif B.sothat C.nowthat D.asif 19.A.permission B.mind C.imagination D.promise 20.A.reaction B.event C.turn D.Competition
实验室用下列方法测定某水样中O2的含量． 1实验原理 用如图所示装置使溶解在水中的O2在碱性条件下将Mn2+氧化成MnOOH2反应的离子方程式为．再用I﹣将生成的MnOOH2还原为Mn2+反应的离子方程式为MnOOH2+2I﹣+4H+＝Mn2++I2+3H2O．然后用Na2S2O3标准溶液滴定生成的I2反应方程式为I2+2Na2S2O3＝2NaI+Na2S4O6． 2实验步骤 ①打开止水夹a和b从A处向装置内鼓入过量N2此操作的目的是 ②用注射器抽取某水样20.00mL从A处注入锥形瓶 ③再分别从A处注入含mmolNaOH溶液及过量的MnSO4溶液 ④完成上述操作后关闭ab将锥形瓶中溶液充分振荡 ⑤打开止水夹ab分别从A处注入足量NaI溶液并用稀H2SO4溶液调节pH至接近中性 ⑥ ⑦取下锥形瓶向其中加入2～3滴作指示剂 ⑧用0.005mol•L﹣1Na2S2O3滴定至终点． 3数据分析 ①若滴定过程中消耗的Na2S2O3标准溶液体积为3.90mL则此水样中氧O2的含量为单位mg•L﹣1． ②若未用Na2S2O3标准溶液润洗滴定管则测得水样中O2的含量将填“偏大”“偏小”或“不变”． ③步骤⑤中加入适量的H2SO4使溶液接近中性其原因是．
15分Everyoneneedstoknowhowtopreventafire.Itisalsoimportanttoknowwhattodowhenit1breakout. Everyyearover11000people2killorinjuredinhousefires.Thesefirescouldhavebeenavoided.Smokerswhoare3carecauseabout200deathsandover6000fires.Morethanofthose4dieinfiresarepoisonedorharmedbysmoke. Iffirehappensdonotattempttofightthefireunlessitissmall.Tryputtingoutasmallfirewithwater.If5firehasspreadoriftheflamesaremorethan20incheshighshutthedooronitwarneveryoneelseinthebuildingandtellthemtogetout.Youshouldleaveanddial911forthefiredepartment. Before6gointoaroomcheckthedoor.Ifthehandleorthedoorishotdonotopenit!Insteadputclothingorawettowelatthebottomofittokeepsmokeout.Ifthedoorisnothotopenit7slow.Ifthereisarushofsmokeheatcloseitagainandshouttowarn8otherinside. NowopenthewindowandshoutFire!.Seewhetheryoucandropsafelytotheground.Usethis9yourescapecourseifyoucan.Ifyouarenotongroundlevelbreakyourfallbypushingamatoutfirst.Loweryourselfatarm's10longbeforedropping.Onceoutsidestayoutoutsideandmakesurethefiredepartmentiscalled. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
10分Asweknoweveryonecanmakemistakesbutdon'tworryaboutit.Thefollowingiswhatweshoulddowhenwemakemistakes. Justadmitit.Don'tthinkthatourmistakesarecausedbyothers.1Do'tblameotherpeopleanddon'tcheatourselveseither. 2Inordertostoptheproblemfromgettingworseweshouldactquicklytosolveit.Ifwedon'tactanddealwiththeproblemquicklyit'llonlymakeusfeelmorestressed.Alsoitisnecessarytomakeaplanofactionandcorrctthemistakeaccordingtoit.3. 4ThosewhohavemadethemostmistakescangetanAfortheyaretheoneswhohavelearnedthemost.Themorewelearnfromourmistakestheclevererweare. 5Whatcausedustomakethemistake?Howcanweavoidmakingthesamemistakeinthefuture?Whenweactwithamethodtogetaoodresultdoitthatwaynexttime.Ifwedon'tweshouldstopthinkaboutitchangeitandtryagain. A.Realizethatmakingmistakesisthebestwaytolearn. B.Don'tbeafraidoffailure. C.Bebraveandfacethefactthatwehavemadethemistakes. D.Solveitatonce. E.Sobeawayfromstress. F.Sodecidequicklyandact. G.Thinkaboutwhatwecanlearnfromourmistakes. 1. 2. 3. 4. 5.
如图正方形ABCD的对角线ACBD相交于点OCE∥BDDE∥AC． 1求证四边形OCED是正方形． 2若AC=则点E到边AB的距离为
8分Whydomendieearlierthanwomen?Thelatestresearchmakesitknownthatthereasoncouldbethatmen'sheartsgointorapiddeclinewhentheyreachmiddleage. Thelargeststudyoftheeffectsofageingonthehearthasfoundthatwomen'slongevitymaybelinkedtothefactthattheirheartsdonotlosetheirpumpingpowerwithage. Wehavefoundthatthepowerofthemaleheartfallsby20﹣25percentbetween18and70yearsofagesaidtheheadofthestudyDavidGoldspinkofliverpooljohnmooresuniversityintheUK. Withinthehearttherearemillionsofcellsthatenableittobeat.betweentheageof20and70one﹣thirdofthosecellsdieandarenotreplacedinmensaidGoldspink.thisispartoftheageingprocess. Whatsurprisesscientistsisthatthefemaleheartseesverylittlelossofthesecells.Ahealthy70﹣year﹣oldwoman'sheartcouldperformalmostaswellasa20﹣year﹣oldone's. ThisgenderdifferencemightjustexplainwhywomenlivelongerthanmensaidGoldspink.Theystudiedmorethan250healthymenandwomenbetweentheagesof18and80focusingonhealthypersonstoremovetheconfusinginfluenceofdisease.TheteamhasyettofindwhyageingtakesagreaterlossonthemaleheartsaidGoldspink. Thegoodnewsisthatmencanimprovethehealthoftheirheartwithregularexercise.goldspinkstressedthatwomenalsoneedregularexercisetopreventtheirlegmusclesbecomingsmallerandweakerastheyage. 1.Thetextmainlytalksabout. A.men'sheartcells B.women'sageingprocess C.thegenderdifference D.heartsandlonglife 2.AccordingtothetexttheUKscientistshaveknownthat. A.womenhavemorecellsthanmenwhentheyareborn B.womencanreplacethecellsthatenablethehearttobeat C.thefemaleheartlosesfewofthecellswithage D.womenneverlosetheirpumpingpowerwithage 3.Ifyouwanttolivelongeryoushould. A.enableyourhearttobeatmuchfaster B.findoutthereasonforageing C.exerciseregularlytokeepyourhearthealthy D.preventyourcellsfrombeinglost 4.Wecanknowfromthepassagethat. A.thereasonwhyageingtakesagreaterlossonthemalehearthasbeenfoundout B.scientistsareonthewaytofindingoutwhythemaleheartlosesmoreofthecells C.theteamhasdonesomethingtopreventthemalefromsufferingthegreaterloss D.womenover70couldlosemoreheartcellsthanthoseattheageof20
下列离子方程式书写不正确的是
若一次函数y=2x-1向上平移2个单位则平移后得到的一次函数的图象与y轴的交点为
8分Itissixo'clockinthemorning.YouareasleepinmyleftarmandIamlearningtheartofone﹣handedtyping.YourmothermoretiredyetmorehappythanI'veeverknownherissoundasleepintheroomnextdoor. Whenyou'reolderwe'lltellyouthatyouwereborninHongKonginthelunaryearofthepig.It'saboysoluckyourneighbourstoldus.Theysaidyouwerethefirstbabytobebornintheblockthisyear.ThistheytolduswasgoodFengShuiinotherwordsapositivesign.NaturallyyourmotherandIwereonlytoohappytobelievethat. Yourcominghasturnedmeupsidedownandinsideout.IampainedbythememoryofeachsufferingchildIhavecomeacrossonmyjourneysasajournalist.Totellyouthetruthit'snearlytoomuchformetoeventhinkofthechildrenbeinghurtandabusedandkilled. LastOctoberinAfghanistanwhenyouweregrowinginsideyourmotherImetSharjaagedtwelvemotherlessfatherlessguidingmethroughthegreyruinsofherhome.Everythingwasgoneshetoldme. ThereisanothermemoryofRwandaandthechurchyardwhereIfoundamotherandherthreeyoungchildrenhuddled蜷缩togetherwherethey'dbeenbeatentodeath.Thechildrenhaddiedholdingontotheirmother. DanielthesememoriesexplainsomeoftheprotectivenessIfeelforyouandtheoccasionalmomentsofblindterrorwhenIimagineanythingbadhappeningtoyou. 1.Wecanseethatthistextiswrittento. A.theauthor'swife B.theauthor'sneighbour C.Daniel D.asufferingchild 2.Theauthormentionssomeofhispainfulmemoriesbecause. A.hewantshissontocareforothers B.hefeelsmorepainthinkingaboutthemasafather C.hehopestoforgetthetragedieshewitnessed D.hisexperiencehasaffectedhismentalhealth 3.Theunderlinedwordblindinthelastparagraphmeans. A.unabletosee B.meaningful C.notclear D.notbasedonreason 4.Whichofthefollowingwordsbestdescribestheauthor'sfeelingwhentypingthistext? A.Critical. B.Regretful. C.Loving. D.Calm.
如图是无机物A～M在一定条件下的转化关系部分产物及反应条件未列出．其中I是由第三周期元素组成的单质中熔点最高的金属K是一种红棕色气体． 1在周期表中组成单质G的元素位于 2在反应⑦中氧化剂与还原剂的物质的量之比为试举出反应⑦的一种工业用途 3在②③⑥⑨中既属于化合反应又属于非氧化还原反应的是填序号． 4反应④的离子方程式是． 5实验室中检验M中所含阳离子的最典型方法是 6工业上制备J的第一步反应原理可用方程式表示为 7将化合物D与KNO3KOH共融可制得一种“绿色”环保高效净水剂K2FeO4高铁酸钾同时还生成KNO2和H2O．该反应的化学方程式是．
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