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Acolleagueofminelivesinthesamestreetasme.HedrivestoworkeverydaywhileIcyclethesamedistancealmosteveryday.ImaginemysurprisewhenIcycledtoworkonedaywentforashowerinthesportscentreandsawmyneighbourinthegymonthecyclingmachineafterdrivingtowork!Idon'tseethelogic.Itwouldbemucheasiertocycletoworksothatyouhavesomeexerciseeverydayaspartofyourdailyroutine. IwantedtopersuadethemtocycletoworksoIdidsomeresearchonafewwebsitesaboutthebenefitsofcyclingtowork.Cyclinghassomeobviousadvantagesoverdriving.Itischeaperitisbetterfortheenvironmentandyoudon'thavetofindaparkingspace.Thepointabouttheparkingspaceisanimportantoneascarparksareoftenfull.Iknowthatmycolleaguesometimesmakesa15﹣minutecarjourneytoworkandthenspends30minuteslookingforaparkingspace!Itistruethatcyclingisalittleslowerthangoingbycarbutatrushhoursitdoesn'tmakemuchdifference.Thetimeittakestocycleisgenerallyeasiertopredictthanthetimeittakestodrive.Thereasonforthisisthatwhenthereisheavytrafficpeopleonbicyclescangetpastwhilepeopleincarshavetowait. Thereareclearhealthbenefitstocyclingevenifyouonlycycleashortdistanceeachday.Accordingtooneexpertifyoucycleregularlyyoushouldbeasfitasaperson10yearsyounger.WellIam47andIstillplayfootballinateamsoIwouldsaythatthisclaimistrue.AswellasbeinggoodforyourhealthIthinkcyclingcanreducestress.IcertainlyfindthatIfeelbetterwhenIarriveatworkthanIdowhenIleavehome;andIfeelbetterwhenIgethomethanIdowhenIleavework.IalsofindthatwhenIcan'tsolveaproblematworktheansweroftencomestomewhenIamcycling.Cyclingrelaxesthemind.Iamgoingtosaytomycolleaguestwowheelsgoodfourwheelsbadeverydayuntiltheygetontheirbikes! 1Theauthorgivestheexampleofhisneighbourtoshow. A.thatit'snotlogicaltodrivetowork B.howsurprisedhewasaboutdrivingtowork C.thatcyclingisgoodforone'shealth D.thatcyclingisagooddailyexercise 2Comparedwithdrivingcyclinghasthefollowingadvantagesexceptthat. A.itischeaper B.it'sbetterfortheenvironment C.itdoesn'tneedaparkingspace D.itstimeiseasiertopredict 3Theauthorfeelsbetteraftercyclingbecauseitcan. A.makeapersonfit B.makeaperson'sstressreduced C.makeapersonyounger D.makeapersonfriendly 4Whatdoestwowheelsgoodfourwheelsbadmeaninthelastparagraph? A.Acarwithtwowheelsisbetterthanacarwithfourwheels. B.Abicyclewithtwowheelsisbetterthanabicyclewithfourwheels. C.Abicycleismuchcheaperthanacar. D.Cyclingisbetterforyourhealththanacar.
Ofcourseshewasn'treallymyauntandoutoffearInevercalledherthattoherface.IonlyreferredtoherasMyAuntFanniebecausethenamealwaysmademyfatherlaughquietlyandgavemymothercausetolookstrictlyatbothofus﹣﹣﹣atmeforbeingdisrespectful失礼的ofmyelderandatmyfatherforencouragingmybadbehavior.IenjoyedbothreactionssoIlookedforeveryopportunitytoworkthenameintoasmanyconversationsaspossible. AsayoungwomanmymotherhadworkedinthekitchenofalargeVictorianfarmhouse.DuringthoseyearsmymotherhelpedAuntFannymakethebestblueberryjam蓝莓酱evertastedbyanyoneinGlenfield.Shewaswell﹣knownforherjamandforneversharingtherecipewithothers.EventhoughmymotherknewtherecipebyheartaslongasAuntFanniewasaliveshenevermadethejamwithoutAuntFannieinourkitchentodirecttheprocessandpreservethesecret. EachAugustmymotherwouldpreparemeforAuntFannie'svisit.OneyearafterIhadhelpedwiththejamprocessAuntFanniegavemeacoinandthenmademepromisethatIwouldneverspendit.Holdontothiscoinshesaidandsomedayyouwillberich.Istillhavemyveryfirstcoingiventomebymygrandmother.SoIkeptthecoininasmallboxandwaitedtobecomerich. InowhavetheblueberryjamrecipeandthecoinfromAuntFannie.Inpeople'seyesAuntFannie'ssuccessresultedfromthatsecretrecipe.Buttomeitwasjustacommonrecipe.NeitherhavetheysignificantlymademebecomearichpersonbutIkeepthemasreminderstoholdontothevaluablethingsinlife.Moneycanmakeyoufeelrichforawhilebutitistherelationshipsandthememoriesoftimespentwithfriendsandfamilythattrulyleaveyouwealthy.Andthatisafortunethatanyonecanbuild. 1WhydidtheauthoralwaysusethenameMyAuntFannieinconversations? A.ShewasfrightenedofAuntFannie. B.ShelikedAuntFannie'srecipe. C.Sheenjoyedherparents'reactions. D.ShegreatlyrespectedAuntFannie. 2Inthelastparagraphtheauthorencouragesreadersto. A.holdontothefirstcoininlife B.makeasmanyfriendsaspossible C.makemoneywiththeirownhands D.spendmoretimewithfamilyandfriends 3Whatcouldbethebesttitleforthispassage? A.TheKeytoSuccess B.BlueberryJamRecipe C.AFortuneBuiltfromaCoin D.ARelationshipofTrust
关于x的一元二次方程ax2+bx+＝0有一个根是﹣1若二次函数y＝ax2+bx+的图象的顶点在第一象限设t＝2a+b则t的取值范围是
今年是“地球一小时”进入中国的第10年世界自然基金会WWF提出“60+生活方式”概念即指任何对自然环境友善对节能减排有益有助于推动环境和社会可持续发展的绿色生活行为方式．下列做法与此概念不符的是
如图DE∥BCBE平分∠ABC若∠1＝70°则∠CBE的度数为
学完电功率后某科学兴趣小组为测量小灯泡的额定电功率进行了以下实验电路如图所示．实验器材额定电压为2.5V的小灯泡正常发光时电阻约为10Ω规格为10Ω1A的滑动变阻器开关电流表电压表各1个新干电池4节导线若干．1请你在答题卷中用笔画线代替导线将电流表接入电路中．2经检查电路连接无误各元件完好闭合开关后无论怎样移动滑片P电压表的示数始终大于2.5V原因是．3解决上述问题后同学们在测出小灯泡的额定功率后把灯泡两段的电压调为额定电压的一半发现测得的实际功率不等于其额定功率的原因是．
假设你是校报记者李华请给你的校长写一份电子邮件预约一次采访在采访中你将询问校长中学生应如何利用互联网辅助学习. 1.时间:11月10日星期五下午5时 2.地点:校长办公室 3.请校长就能否有时间接受采访给予回复并询问能否给校长拍照为校报配图 注意: 1.邮件的开头和结尾已给出但不计入总词数; 2.可适当增加细节以使行文连贯. Dearheadmaster Sincerelyyours LiHua
某学校八年级共400名学生为了解该年级学生的视力情况从中随机抽取40名学生的视力数据作为样本数据统计如下 4.24.14.74.14.34.34.44.64.15.2 5.24.55.04.54.34.44.85.34.55.2 4.44.24.35.34.95.24.94.84.65.1 4.24.44.54.14.55.14.45.05.25.3 根据数据绘制了如下的表格和统计图 根据上面提供的信息回答下列问题 1统计表中的a＝b＝ 2请补全条形统计图 3根据抽样调查结果请估计该校八年级学生视力为“E级”的有多少人 4该年级学生会宣传部有2名男生和2名女生现从中随机挑选2名同学参加“防控近视爱眼护眼”宣传活动请用树状图法或列表法求出恰好选中“1男1女”的概率．
AsIamgettingolderIfind1terribleproblemthatmymemoryisgettingevenworse.IalwaysforgetwhatIhaveexactlydone.What'swrongwithme?IthinkIshouldn'thavebeensoforgetfuljustbecauseI'mnotoldenoughtoforgetthings.2mustbehorribleifthesituation3continueinthenextyears.NowIhavetotakeanote4avoidmissingsomethingIshoulddo.HoweverseveralyearsagoItookgreat5proudinmygoodmemorybecauseIwouldkeepsomethinginmymindeasily.That's6Idon'tthinkstudywasaproblemwhenIwasinhighschool. PerhapsrecentlyIwasbusy7somelittlethingsbothinfamilyandworksoIwas8completetired.ButmeanwhileIhadtoadmitthattimehadtakenawaymyenergy.Nomatterwhoyouare9howstrongyouareyou'recertaintobeweakinfrontof10naturelaw.
在沙漠或海面上常能看到海市蜃楼现象．下列关于海市蜃楼现象解释正确的是
在综合实践活动中小峰设计了一种煮饭电路如图甲所示图中R1和R2均为电阻丝S1是自动控制开关煮饭时将该电路接入220V电源在30min内电路总功率随时间变化的图象如图乙所示求 10～5min内通过R1的电流 230min内电路消耗的电能 310～15min内R1的电功率．
如图在矩形纸片ABCD中将AB沿BM翻折使点A落在BC上的点N处BM为折痕连接MN再将CD沿CE翻折使点D恰好落在MN上的点F处CE为折痕连接EF并延长交BM于点P若AD＝8AB＝5则线段PE的长等于．
人们常用的工具往往都是利用了简单机械的原理． 1如图所示的简单机械正常使用时费距离的是． 2用如上图D所示的动滑轮匀速提起G＝200N的物体实际测得拉力F为110N不计绳重及摩擦则该滑轮重为N．
小圆同学对图形旋转前后的线段之间角之间的关系进行了拓展探究． 一猜测探究 在△ABC中AB＝ACM是平面内任意一点将线段AM绕点A按顺时针方向旋转与∠BAC相等的角度得到线段AN连接NB． 1如图1若M是线段BC上的任意一点请直接写出∠NAB与∠MAC的数量关系是NB与MC的数量关系是 2如图2点E是AB延长线上点若M是∠CBE内部射线BD上任意一点连接MC1中结论是否仍然成立若成立请给予证明若不成立请说明理由． 二拓展应用 如图3在△A1B1C1中A1B1＝8∠A1B1C1＝60°∠B1A1C1＝75°P是B1C1上的任意点连接A1P将A1P绕点A1按顺时针方向旋转75°得到线段A1Q连接B1Q．求线段B1Q长度的最小值．
解不等式组并写出它的所有整数解．
在学校的体育训练中小杰投掷实心球的7次成绩如统计图所示则这7次成绩的中位数和平均数分别是
如图在菱形ABCD中点E是BC的中点以C为圆心CE为半径作弧交CD于点F连接AEAF．若AB＝6∠B＝60°则阴影部分的面积为
小明用两个不同的白炽灯做“探究串联电路的电流特点”实验时发现一个灯泡较亮而另一个灯泡较暗则较亮的灯泡
甲乙两个完全相同的杯子盛有不同浓度的盐水将同一个鸡蛋先后放入其中当鸡蛋静止时两个杯子中液面恰好相平鸡蛋所处的位置如图所示则 1甲杯底部所受的液体压强乙杯底部所受的液体压强．选填“＜”“＝”或“＞”下同 2鸡蛋在甲杯中受到的浮力在乙杯中受到的浮力．
如图所示岸上的树木A点距离湖面1.5米湖水深3米湖中A点的倒影距离湖面米当湖中水面上涨后此时树木倒影到湖面的距离选填大于小于或等于湖水上涨前树木倒影到湖面的距离．
电动牙刷越来越受到消费者的青睐．电动牙刷工作时能深入牙齿清洁牙缝刷毛的颤动能促进口腔的血液循环对牙龈组织有按摩效果．下表为某电动牙刷参数． 1充电时只需将牙刷放在通电的底座即可感应充电牙刷和底座之间既没有用线连接也没有金属接点安全又方便．其充电原理是． 2当牙刷正常工作时求电流大小保留小数点后两位 3根据表中信息将已经耗完电能的电池充满理论上需要多少时间 4无论用哪种牙刷刷牙都需要掌握正确的刷牙方法关于刷牙下列说法正确的有 A．每次刷牙时间约3分钟左右B．来回拉动牙刷幅度不超过一个牙位 C．刷牙时动作要用力D．3个月更换一次牙刷
2017年9月12日天舟一号飞船与天宫二号空间实验室成功进行了对接如图是即将对接时的情境“天宫二号”绕地球飞行一圈约90分钟．下列说法中正确的是
为提高学生的阅读兴趣某学校建立了共享书架并购买了一批书籍．其中购买A种图书花费了3000元购买B种图书花费了1600元A种图书的单价是B种图书的1.5倍购买A种图书的数量比B种图书多20本． 1求A和B两种图书的单价 2书店在“世界读书日”进行打折促销活动所有图书都按8折销售学校当天购买了A种图书20本和B种图书25本共花费多少元
如图一个可以自由转动的转盘被分成了6个相同的扇形转动转盘转盘停止时指针落在红色区域的概率等于．
代数式与代数式3﹣2x的和为4则x＝．
2018年2月在韩国平昌举行的冬奥会上我国选手武大靖获得500米短道速滑冠军．滑冰时冰刀鞋接触的冰在__下填物态变化成水更有利于滑动．冰刀鞋上的刀刃通常做得很薄目的是为了增大．
Soyoujustfinishedwhatyouthoughtwasagreatprojectatworkandnowyourbossislistingallthethingsyouneedtoimproveupon.1.Afterallpositivecriticism批评isakeypartofanyjob.Throughthisarticlelearnhowtoacceptcriticismanddoyourjobswell. 1.Acceptthatyouarenotperfect. Ifyoubegineachtaskthinkingthatnothingwillgowrongyou'refoolingyourself.2.Theimportantthingistolearnfromthem. 2.3. Afteryou'vefinishedandbeforeyousubmitittoyourbossbesureyou'vegoneovereverythingcarefully.Thiscanhelpyoutoavoidsillymistakesandensurethatyourbosswon'thavetobotheryouaboutminorproblems. 3.Listencarefully. 4.Takenotesandremindyourselfhowtofixtheproblem.Thisstepisthemostdifficultasitcanmeanthatonemustputone'sprideawayandadmitone'sresponsibilityinone'swork﹣relatederrors. 4.Agreewithpartofthecriticism. Whenfacedwithcriticismmostpeoplefocusonthepartofthenegativefeedbackthatmaynotbetrueandignoretherest.Thisdoesn'tsolveanyproblemsandyoudon'tlearnanything.Whenyouagreewithonepartofthecriticismyoubecomeopentolearning.5.Evenagreeingwithonesmallaspectofthecriticismwillcreateanatmosphereofteamwork.Thefocusthencanbecomehowyou'llworktogethertosolveaproblemwhichwilllessenyourfeelingofbeingattacked. A.Don'ttakeitseriously. B.Don'tgetdiscouraged. C.Youwillmakemistakes. D.Doublecheckyourwork. E.Youdon'thavetoagreewitheverything. F.Infactyouneedtimeandcouragetoprocesstheinformation. G.Neverignorecriticalcommentsoryouwillrepeatthesamemistakes.
在测定额定电压为2.5V小灯泡电功率的分组实验中1请用笔画线代替导线将图甲中的实物电路连接完整．2小金闭合开关后发现灯泡不亮电流表无示数电压表有示数则故障可能是．排除故障后移动滑片使小灯泡正常发光此时电流表示数如图乙所示则小灯泡额定功率为W．3小华在进行实验数据处理时算出了小灯泡的平均功率如下表其他同组同学都认为这样处理数据是不合理的他们的理由应该是．
下面的图形是用数学家名字命名的其中既是轴对称图形又是中心对称图形的是
小天利用手中的条形磁体做了以下小实验其中结论正确的是
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