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如表是三种物质在不同温度时的溶解度，根据表中信息回答问题． （1）60℃时，氯化钠的溶解度 硝酸钾的溶解度（填“＞”“＝”或“＜“）． （2）表中某物质的饱和溶液随温度升高析出固体，该物质...
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甲乙丙三种物质在不同温度下的溶解度g见下表下列有关说法正确的是
三种物质的溶解度大小顺序为：甲＞乙＞丙；
30℃时，三种物质的饱和溶液中溶质的质量分数：甲＞乙＞丙；
降低温度可使丙的不饱和溶液变成饱和溶液；
三种物质的溶解度都随温度升高而增大。
甲乙丙三种物质的溶解度曲线如图所示.根据图中信息回答下列问题150℃时乙物质的溶解度是g.220℃时
甲乙丙三种物质的溶解度曲线如图所示.根据图中信息回答下列问题150℃时乙物质的溶解度是g.220℃时
如图为ABC三种固体物质在水中的溶解度曲线据此回答下列问题1T1℃时在100克水中最多溶解克A.2T
甲乙丙三种物质的溶解度曲线如图所示根据图中信息回答下列问题150℃时将40g乙物质加入到50g水中充
甲乙丙三种物质在不同温度下的溶解度单位g／100g水见下表根据表中数据可推出的结论是
甲、乙、丙三种物质的溶解度大小顺序是甲>乙>丙
30℃时，三种物质的饱和溶液溶质质量分数甲>乙>丙
降低温度可使丙的不饱和溶液变为饱和溶液
使甲物质从一定温度下的饱和溶液中析出，一般采用蒸发溶剂的方法
CaOH2在不同温度时的溶解度如表根据表中信息判断下列说法正确的是
Ca(OH)
2
的溶解度随温度的升高而增大
20℃时，Ca(OH)
2
的溶解度为0.16g
40℃时，降低Ca(OH)
2
饱和溶液温度会析出溶质
60℃时，向100g水中加入0.20g Ca(OH)
2
充分搅拌，固体完全溶解
如图所示是甲乙丙三种物质的溶解度曲线在20℃时分别取等质量的三种物质的饱和溶液放入三只烧杯中然后向溶
根据图中abc三种固体物质的溶解度曲线回答问题1温度为℃时a和c物质的溶解度相同2要使接近饱和的a物
右图为A.B.C.三种固体物质的溶解度曲线回答下列问题1在_________℃时A.C.两种物质的溶
甲乙丙三种物质的溶解度曲线如图所示.根据图中信息回答下列问题150℃时乙物质的溶解度是该温度下其饱和
下图中是A.B.C.三种固体物质的溶解度曲线请根据图像回答下列问题1在A.B.C.三种物质中溶解度受
如图是几种物质的溶解度曲线根据图示回答1在图1中t2℃时甲物质的溶解度为________g2甲丙在_
甲乙丙三种物质的溶解度曲线如图所示根据图中信息回答下列问题150℃时乙物质的溶解度是g220℃时甲乙
如图是几种物质的溶解度曲线根据图示回答1在图1中t2℃时甲物质的溶解度为________g2甲丙在_
甲乙丙三种物质的溶解度曲线如图所示.根据图中信息回答下列问题150℃时乙物质的溶解度是g.220℃时
如图为A.B.C.三种固体物质在水中的溶解度曲线据此回答下列问题1T.1℃时在100克水中最多溶解克
右下图是A.B.C.三种物质的溶解度曲线图看图后回答下列问题1三种物质中溶解度受温度影响最大的___
如图所示是甲乙丙三种物质的溶解度曲线在20℃时分别取等质量的三种物质的饱和溶液放入三只烧杯中然后向溶
甲乙丙三种物质的溶解度曲线如图所示根据图中信息回答下列问题150℃时将40g乙物质加入到50g水中充
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Personalitiesareourcharacteristicpatternsofthoughtsfeelingsandbehaviorsandhavingagreatpersonalityisn'tabouttryingtobelikeotherpeople・1it'sprobablybecausetheyaresincereandhappy.Therearealwayswaysthatyoucanimproveyourself 2.Awkwardsituationsarealwaysuncomfortable・Don'ttrytobesomeonethatyouaren't.Ifyoumeetsomenewpeopledon'tworryaboutnothavinganythingincommonwiththemjustmakelightmeetsomenewpeopledon'tworryaboutnothavinganythingagreathappy.trytobesomeonethatyouaren't.Ifyouincommonwiththemjustmakelightconversations?befriendlyandaskquestions. Behappy.3.Noonecanresistahappyperson.Thisdoesn'tmeanyouhavetohideyourfeelings.Ifsomething'sreallybotheringyouneverfeelyouhavetofake假装asmile.Justmakesureyoutrytoseethebestinthingsandshowpeoplethatyou'reahappyperson. Avoidtryingtobepopular.4you'renotgoingtocelebrateforyourself.Themostimportantthingisdevelopingadependablegroupoffriendswhoyoucareaboutandwhocareaboutyou. Developyourinterests.Onevitalpartofhavingagoodpersonalityishavinginterestingthingstotalkabout.Thatdoesn'tmeanyouneedtostudyastrophysics一youjustneedtohaveinterests.Ifyouareexcitedaboutsomethingyouprobablywillbeabletotellotherpeopleaboutitinaninterestingway.Readsomethingeveryday.Watchmovies.Lookfornewhobbies.5・ A.Alwaysbehonestwithyourself B.Whateveryoudoinordertomakefriendswithothers C.Talkaboutwhatyoulikeinsteadofwhatyoudon'tlike D.Justtrytoexperiencewhattheworldhasofferedtoyou E.Trytoalwayslookonthebrightsidebepositiveandsmile F.Whenyouthinksomeonethatyouseehasagoodpersonality G.Ifitlookslikeeverythingyoudoiswiththegoalofgettingotherpeopletolikeyou
TheNationalStorytellingYouthOlympicsisaneventwherethousandsofkidsfromgrades6to12competeagainsteachotherbytellingstories.ItissponsoredbytheMaster'sDegreePrograminReadingandStorytellingatEastTennesseeStateUniversity.Thesolepurposeofthiseventistopromoteandencourageboththeartandscienceofstorytellingamongmiddleschoolandhighschoolstudents.Althoughthiseventiscompetitiveitsunderlying内在的intentandgoalistoprovidestudentsacrossthenationwithareasontopractisenumerousnoncompetitiveskills. Thoseskillsincludeskillfulsportsmanshipresponsiblebehaviorandanattitudeofrespectforothersandthestorytellingstyle.TheeventualgoaloftheNationalStorytellingYouthOlympicsistoencourageeveryclassroominAmericatodiscoverorrediscoverthebeautyofstorytellingandstoryperformance.TheNationalStorytellingYouthOlympicstakesplaceusuallyaroundthefirstweekendinMarch.StudentsfromalloverthecountryarrivebybusplaneorautomobileinJohnsonCityTennessee.TheyusuallyarriveonThursdayorFriday.ThosethatarriveonThursdaymakeuseoftheirearlyarrivalbytellingstoriesatlocalschools.OnFridayaneveningmealispreparedforallcontestantscoachesandparents.Gamesareplayedstoriesaretoldandlifetimefriendshipsbegin.Saturdayisthedayofthebigevent.Aluncheon午餐会isheldintheafternoonsocontestantscanfamiliarizethemselveswiththesurroundingsanddoasoundcheck. Theeventisdividedintothreecategoriesseparatedbygrades.Contestantsarejudgednotonlybytheirstorytellingperformancebutalsobytheattitudeandbehaviortheydisplayduringtheentireweekend.AwinnerispickedfromeachofthethreecategorieshoweverthereisanoverallwinnerwhoisawardedthenameofGrandTorchBearer.Thispersonisselectednotonlybythejudgesbutalsobythecontestants.Afterthewinnershavebeenannouncedthecontestantsretreatbacktotheirhotelwhereacelebratoryicecreampartyisheldandbelieveitornottheytellmorestories!ThisiswhattheNationalStorytellingYouthOlympicsisallaboutdevelopingalovefortheartofstorytelling. 1WhywouldsomeoneMOSTLIKELYchoosetoattendtheNationalStorytellingYouthOlympics? A.Toimprovestorytellingskillswhilemeetingnewfriends. B.Tocompetefiercelywiththebeststorytellersinthecountry. C.Toearnmoneyandfame. D.Todevelopone'spersonalskillinlectureonly. 2Whenisdinnerpreparedforallcontestantscoachesandparents? A.Wednesday. B.Friday. C.Thursday. D.Saturday 3WhichofthefollowingsetsofwordsbestdescribestheGrandTorchBearer? A.competitiveambitioustalented B.respectfulresponsibleskilled C.athleticdeterminedcreative D.imaginativeindividualisticpessimistic 4Whatistheauthor'sattitudetowardstheactivity? A.Critical B.Positive C.Neutral D.Indifferent
如图AB为⊙O的直径点C在⊙O上若∠ACO＝50°则∠B的度数为
假定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. 壇加在缺词处加一个漏字符号︿并在其下面写出该加的词. 刪除把多余的词用斜线\划掉. 修改在错的词下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限一词. 2.只允许修改10处多者从第11处起不计分. Smartphoneappscertainlymakeourlifeeasier.Currentitlooksasiftheycanevenhelpusourhomework.Awidevarietyofappsaimatstudentshavebeenreleased.Mostoftheseappsallowsuserstotakeaphotoofmyschoolworkandthecorrectanswerswilljustappearontheirsmartphones.Convenientalthoughtheyaretheseappspresentproblemstobothparentsandteachers. Moststudentsjustcopytheanswersfromtheappswhileonlyafewusetheappstostudy.What'sbadsomestudentsevenusethestudyaidappsassocialnetworks.Howeverwearenotmakingthesuggestionthatstudyaidappsshouldbecompletelyban.Parentsandteachersshouldgivenecessaryguidancetohelpstudentstaketheadvantageofstudyaidapps'strengthsandavoidtheirweakness.
如图所示是一个三棱柱纸盒．在下面四个图中只有一个展开图是这个纸盒的展开图那么这个展开图是
如图在△ABC中DE∥ABDE分别与ACBC交于DE两点．若AC＝3则DC＝．
计算﹣2﹣π﹣0+|﹣2|+4sin60°．
“单词的记忆效率”是指复习一定量的单词一周后能正确默写出的单词个数与复习的单词个数的比值．如图描述了某次单词复习中MNST四位同学的单词记忆效率y与复习的单词个数x的情况则这四位同学在这次单词复习中正确默写出的单词个数最多的是
如果a2﹣2a﹣1＝0那么代数式a﹣3a+1的值是
如图在平面直角坐标系xOy中过点A20的直线ly＝mx﹣3与y轴交于点B． 1求直线l的表达式 2若点C是直线l与双曲线的一个公共点AB＝3AC求n的值．
实数abcd在数轴上的对应点的位置如图所示下列结论①a＜b②|b|＝|d|③a+c＝a④ad＞0中正确的有
在平面直角坐标系xOy中我们把横纵坐标都是整数的点叫做整点．已知点A04点B是x轴正半轴上的点记△AOB内部不包括边界的整点个数为m．当m＝6时点B的横坐标a的取值范围是．
抛物线My＝ax2﹣4ax+a﹣1a≠0与x轴交于AB两点点A在点B左侧抛物线的顶点为D． 1抛物线M的对称轴是直线 2当AB＝2时求抛物线M的函数表达式以及顶点D的坐标 3在2的条件下直线ly＝kx+bk≠0经过抛物线的顶点D直线y＝n与抛物线M有两个公共点它们的横坐标分别记为x1x2直线y＝n与直线l的交点的横坐标记为x3x3＜4若当﹣2≤n≤﹣1时总有x1﹣x3＜x3﹣x2＜0请结合函数的图象直接写出k的取值范围．
Mytwo﹣andfour﹣year﹣oldboyslove﹣towinwhetherthey'reracingtheirbikesdownthesidewalkorjustfinishingtheirsnacks.It'struethatthosewithhighstatusfromworldleadersandprizewinnerstoathletesandmoviestarsarepeoplewelikeanclrespect.ArecentstudypublishedinNatureHumanBehaviourshowedthatweseemtohaveaninate天生的preferenceforhigh﹣rankingpeople﹣butonlyifthosepeoplearen'thurtfultowardothers. Researchersshowedtoddlersaged21to31monthsascenewheretwopuppets木偶approachedoneanotherfromoppositesidesofastageandonebowedtolettheotherpassfirst.Askedwhichpuppettheylikedbetter180fthe21toddlersintheexperimentreachedforthepuppetwhohadbeenallowedtopass.Becauserespectfromothersisamarkerofstatusthissuggeststhatchildrenhaveapreferenceforthosewithahigherstatus﹣evenbeforeagethree. Howevertheresultswerequitedifferentwhentwopuppetsapproachedoneanotherandoneusedforcetoknocktheotherdownbeforecontinuingtotheotherside.Inthiscase180fthe21toddlersreachedfortheonewhowasknockeddown.AstheresearchersconcludedWhenapproachingothersveryyoungchildrencarenotonlywhowinsbutalsohow.Thepreviousexperimenthasshownthattoddlersknowaboutsocialstatus9butthisexperimentwentonestepfurtherbyprovingtheyhaveanobviouspreferenceforhighstatus.Sincetheparticipantsweresoyoungthismightevenbeaninnatehumanpreference. Inawordthisnewresearchsuggeststhatyoungchildrenappreciatepeoplewhodowellwhileatthesametimedoinggoodtoothers.Sowhenmyfour﹣year﹣oldthinksthathehastogethisshoesonfirstI'llkeepremindinghimthathelpinghisbrothersotheybothfinishfasteriswhatwinningisallabout. 1Whatdowetendtodoaccordingtothefirstparagraph? A.Seekchallengesallthetime. B.Admirehigh﹣rankingpeople. C.Takeadvantageofhighstatus. D.Hurtotherswithoffensivewords. 2Whydidtoddlerspreferthepuppetallowedtopass? A.Itlookedlovely. B.Itbehavedsmartly. C.Itseemedpolite. D.Itwasrespected. 3Whatcanweinferfromthelatterstudy? A.Slowerpeoplearebetterlovedbytoddlers. B.Peoplenaturallydislikeunkindbehavior・ C.Toddlerscarelittleabouthighsocialstatus. D.Beinghelpfulcontributestobeingsupported. 4Whatshouldwedowhenweencouragechildrentowin? A.Instructthemtouseproperandcreativeways. B.Advisethemtobeashardworkingaspossible. C.Remindthemtobeconsideratetootherpeople. D.Tellthemtotrytocooperatewithsomeoneelse
分解因式12m2﹣3＝．
已知一元二次方程x2﹣4x+k＝0有两个不相等的实数根 1求k的取值范围 2如果k是符合条件的最大整数且一元二次方程x2﹣4x+k＝0与x2+mx﹣1＝0有一个相同的根求此时m的值．
假定你是某国际学校的学生会__张强.为配合你校正在开展的体育运动周活动请你用英语写一封倡议书号召全校同学积极参加体育锻炼. 注意词数100左右开头和结尾己给出但不计入总词数. Dearschoolmates CouldIhaveyourattentionplease? Thanks.
Whatdoesitreallymeantobesuccessful? 1.Itisaboutbeingabletoliveahappylife. Ifyouwanttohaveasuccessfullifeherearethreethingsyouneedtofocuson. ©Believeinyourself Ifyoudon'tbelieveinyourselfhowdoyouexpectotherpeopleto?Whenyoubelieveinyourselfitfuels促进yourcreativityandyourmotivation动力todothings.AllsuccessfulpeoplefromGandhitoTeslabelievedinthemselves.2.Weallhavetotrustthatwehavetheabilitytoturntheimpossibleintothepossible. ©Knowyourintention 3itisimportanttohaveanunderstandingofyourintention.Ifyourintentionissimplyrootedinmoneyandfameyouarenevergoingtotrulyfeelsuccessful.Moneyandfameonlyservetheego自负anddon'tprovidetruefeelingsofsuccess.Foratrulysuccessfullifeyourintentionhastoberootedinyourpurposeandpassions热情.Whenyourintentionistoserveyourpurposemakeachangeintheworldandexpressyourtalentsyouwillfeeltruesuccessandsatisfaction. ©4 Successisallaroundyourightnow.Stoptotakeamomentandyou'llnoticetheamazingsuccessthatisalreadypresentinyourlife.5.Beingthankfulforthetiniestsuccessesinlifewillhelpyoutocreatemoreandmoresuccess. A.Realizeyouarealreadysuccessful B.Discoverthetruemeaningofsuccess C.Thisiswhatgavethemthedrivetosucceed D.Ifyouwanttocreateagoodlivingcondition E.Whenitcomestoachievinggreatnessinthislife F.Thatiswhenyouwillstarttofeeltrulysuccessful G.Successissomuchmorethanjustmoneyorfame
2022年在北京将举办第24届冬季奥运会很多学校都开展了冰雪项目学习．如图滑雪轨道由ABBC两部分组成ABBC的长度都为200米一位同学乘滑雪板沿此轨道由A点滑到了C点若AB与水平面的夹角α为20°BC与水平面的夹角β为45°则他下降的高度为米．
2019SummerCampandActivitiesGuide SummerStarsProgram Thisseven﹣weeksummerprogramisforchildren18monthst05yearsold.Thechildrentakepartinactivitiessuchassportsmusicartstorytimeanddailywaterplay.Thereisathree﹣dayoptionfortoddlersaged18t030months.Two﹣year﹣oldsmaychooseathree﹣dayoptionorattendfivemorningsaweek.Three﹣tofive﹣year﹣oldsmaychooseahalf﹣day9am﹣12noonoptionorafulldayoptionfrom9am﹣2pm BethElDayCamp Itistheplacetobeforchildrenaged2﹣8!HavefunwithusfromJune27toAugust21.Weofferbeforeandaftercampcarefrom7amt07pm.CamperslovethesportsespeciallytennisswimmingtwiceadayinthepoolmusicartsandcraftscookingdancingnatureSTEMyogaandmuchmore!Wehavelocalbest﹣trainedprofessionalstaff. TheHouseofSports Theweeklysportscampoffersprogramsforchildrenofallagesandabilitylevel.Foryoungercampersweofferamulti﹣sportcampincludingbothlearningandplayingavarietyofsportseachday.Forchildrenin3rdgradeandolderwealsooffersportspecificcampsinlacrossebasketballsoccerandbaseball.Allcampstakeplaceina100000squarefootclimatecontrolledfacility设施inArdsleyandallcampsarestaffedbyprofessionalcoachesandinstructors. SummerPlayPlaceCamp Itoffersyoungchildrenauniqueseven﹣weeksummerexperience.Theprofessionalcertifiedstaffprovideartsandcraftswaterplaystoriesgamessportsandsnackswithinalovingenvironment.The3'sand4'sprogramisimprovedbyspecialistsinmusicmovementandnatureandspecialthemedays.Thereareseparationclassesandclasseswithalovedonetostayasoptionsforchildrenwhowillbeenteringa2'sprograminSeptember.Yourchildrenwilllearnandlaugh.Clickheretoregister. 1WhatcancampersdoatSummerStarsProgram? A.Havefuncookingalone. B.Playwithwaterfortwomonths. C.Enjoythestorytime. D.UsethefacilityinArdsley. 2Whatdothelastthreehaveincommon? A.Theyareintendedforadults. B.Theymainlyfocusonlearning. C.Theyoffervariousfreesnacks. D.Theyhavequalifiedemployees. 3Fromwhichisthetextmostprobablytaken? A.Awebsite. B.Aresearchpaper. C.Anewspaper. D.Atravelmagazine
如果代数式有意义那么实数x的取值范围是
Apigsavedfrombeingkilledattheeleventhhour1beaworld﹣famousartistsofar.Pigcassoassheisnowknownwas2luckyrescuedwithhersisterRosiewhenshewasjusttwomonthsold. AnimalwelfarecampaignerJoanneLefsontookthemtoafarminFranschhoeknearCapeTown.3thebaseforherrescuepetcharitySanctuarySAwasstillbeingbuiltShenoticedtheyoungPigcassopicking4workman'spaintbrushesinhermouth.5shockasMsLefsonwasshedecidedtogivePigcassoacanvas油画布. Nowattheageofjust21monthsoldshe6believetobetheworld'sonlypaintingpigandhassoldoneofher7workforasmuchas£1700.Despiteselling44paintingsacrosstheUKUSASouthKoreaandMalaysiaMsLefsonsaysinmanywaysPigcassoisjustaregularpig.HermostexpensivepieceBrexitwhichfeaturesaroughrepresentationofthewordinthecoloursoftheBritishflagwassoldtoaDutchcollectorfor£1730. Pigcassosignseachcanvasby8diphersnout鼻子inamixtureofbeetrootjuiceandacrylicpaint.But9pigsdon'tknowistheconceptofcolour.ThereforeMsLefsonselectswhichpainttousebeforelettinghercreativityflow. Herownersayssheoftentakes10inspirefromhersurroundings・
在平面直角坐标系xOy中有不重合的两个点Qx1y1与Px2y2．若QP为某个直角三角形的两个锐角顶点且该直角三角形的直角边均与x轴或y轴平行或重合则我们将该直角三角形的两条直角边的边长之和称为点Q与点P之间的“折距”记做DPQ．特别地当PQ与某条坐标轴平行或重合时线段PQ的长即点Q与点P之间的“折距”．例如在图1中点P1﹣1点Q3﹣2此时点Q与点P之间的“折距”DPQ＝3． 1①已知O为坐标原点点A3﹣2B﹣10则DAO＝DBO＝． ②点C在直线y＝﹣x+4上请你求出DCO的最小值． 2点E是以原点O为圆心1为半径的圆上的一个动点点F是直线y＝3x+6上以动点．请你直接写出点E与点F之间“折距”DEF的最小值．
如图在平面直角坐标系xOy中点A的坐标为21如果将线段OA绕点O逆时针方向旋转90°那么点A的对应点的坐标为
如图半圆O的直径AB＝5cm点M在AB上且AM＝1cm点P是半圆O上的动点过点B作BQ⊥PM交PM或PM的延长线于点Q．设PM＝xcmBQ＝ycm．当点P与点A或点B重合时y的值为0 小石根据学习函数的经验对函数y随自变量x的变化而变化的规律进行了探究． 下面是小石的探究过程请补充完整 1通过取点画图测量得到了x与y的几组值如表 2建立平面直角坐标系描出以补全后的表中各对对应值为坐标的点画出该函数的图象 3结合画出的函数图象解决问题当△PBM的面积为1时PM的长度约为cm．
假定你是李华你的英国笔友Peter发邮件向你询问中国的植树节TreePlantingDay的相关信息.请你回 复邮件内容包括 1.节日日期及其主要活动 2.人们重视植树节的原因 3.建议他来中国体验. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
Foodwaterandshelter1bebasichumanneedsbutitisreportedthatthereare1.2billiononpeopleintheworldwithoutenoughhousing.Thismaychangethanks2arevolutionaryuseof3Dprinterstoconstructhouses. TechcompanyICONhasdevelopedamethodfor3createaone﹣floor60﹣square﹣meterhouseoutofcement水泥inadayfor﹩10000.Thisisasmallamountofboththetimeandcost4needtobuildasimilarconstructionusingtraditionalmethods.Thecompanyaim5bringthatcostdownto﹩4000perhouse.Atraditionalhousewouldbemuch6expensivethanthat.Theaffordabilityofthesehousesmakes7theymuchmoreaccessible可使用的tothosewholiveinpoorareas. ICONhasteamedupwithNewStoryanon﹣profit非营利的organization8focusesonfindinginternationalhousingsolutions.Togethertheywillstartbuildinghomesindevelopingcountries. Thistechnologyisan9amazesolutionforthosewhoareinneedofshelter.10isalsopossiblethat3D﹣printedhouseswillbecomecommoninrichercountriesinyearstocome.
FormorethantwohundredyearstheWhiteHousehasstoodasasymboloftheUnitedStatesPresidencytheU.S.governmentandtheAmericanpeople.In1790PresidentGeorgeWashingtondeclaredthatthefederalgovernmentwouldresideinadistrict''notexceedingtenmilessquare…ontheriverPotomac.AspreparationsbeganacompetitionwasheldtofindabuilderofthePresident'sHouse.NineproposalsweresubmittedandtheIrish﹣bornarchitectJamesHobanwonthegoldmedalforhispracticalandhandsomedesign.ConstructionbeganwhenthefirstcornerstonewaslaidinOctoberof1792.AlthoughPresidentWashingtonmonitortheconstructionofthehouseheneverlivedinit.Itwasnotuntil1800whentheWhiteHousewasnearlycompletedthatitsfirstresidentsPresidentJohnAdamsandhiswifeAbigailmovedin. AmericanpresidentscanexpresstheirindividualstyleinhowtheydecoratethehouseandinhowtheyreceivethepublicThomasJeffersonheldthefirstinaugural就职典礼openhousein1805manyofthoseWho.attendedtheswearing﹣inceremonyattheU.S.Capitolsimplyfollowedhimhome.PresidentJeffersonalsoopenedthehouseforpublictoursandithasremainedopenexceptduringwartimeeversince.InadditionJeffersonwelcomedvisitorstoannualreceptionsonNewYear'sDayandontheFourthofJuly.AbrahamLincolndidthesamebutthentheinauguralcrowdsbecamefartoolargefortheWhiteHousetoaccommodatecomfortablyandthisalsocreatedasecurityissue.ItwasnotuntilGroverCleveland'sfirstpresidencythatsomeeffectivecrowdcontrolmeasuresweretakentoaddresstheproblemcausedbythispractice. AtvarioustimesinhistorytheWhiteHousehasbeenknownasthePresident'sPalacethePresident'sHouseandthe''ExecutiveMansion.PresidentTheodoreRooseveltofficiallygavetheWhiteHouseitscurrentnamein1901. 1AccordingtothepassagewhichofthefollowingisNOTtrueabouttheWhiteHouse? A.TheWhiteHousehashadseveralnames. B.ThedesigneroftheWhiteHousewasanAmericanpresident. C.PeoplewerenotallowedtovisittheWhiteHouseduringwartime. D.TheWhiteHouseislocatedinadistrictnotlargerthantenmilessquare. 2Whatdoesthispracticerefertointhesecondparagraph? A.DecoratingtheWhiteHouse. B.Accommodatingthecrowdscomfortably. C.HoldinganinauguralopenHouse. D.Joiningintheswearing﹣inceremony. 3WhostartedtheconstructionoftheWhiteHouse? A.GeorgeWashington. B.JamesHoban. C.JohnAdams. D.ThomasJefferson. 4Whatisthispassagemainlyabout? A.ThedesignoftheWhiteHouse. B.ThelocationoftheWhiteHouse. C.TheimportanceoftheWhiteHouse. D.ThehistoryoftheWhiteHouse.
2018年4月18日被誉为“中国天眼”的FAST望远镜首次发现的毫秒脉冲星得到国际认证．新发现的脉冲星自转周期为0.00519秒是至今发现的射电流量最弱的高能毫秒脉冲星之一．将0.00519用科学记数法表示应为
Myfamilyisbigonbaseball.Grandpa1coachedhisteamtotwonationalgames.Fatherplayedforthreedifferentcollegesandwas2askedtotryoutfortheLosAngelesAngelsoneofthetopteamsintheUS.MinutesbeforeIwasbornmy3werewatchingalivebaseballmatchonTVYoucouldsayIwas4toplaythegamebutfranklyallthrough.elementaryschoolIhatedit. Ispentmostdaysofmysummeratthebaseballparkinmyneighborhood.Ireallyshouldhavebeen5atbaseballforIpracticedalmosteverydaybutIwasnot.Iwouldn'thittheballhardorthrowit6.WhenmydadorgrandpaaskedmeifIwantedto7myanswerwasalwaysno.Finallytheystoppedgivingmea8justmakingmeplaywhetherIlikeditornot. Thissameold9continuedforyears.MydadandgrandpawouldmakemepracticeandIwouldputno10inuntilaroundGrade10.Iwasolderand11thanmy12﹣year﹣oldself.Ifinally12theirtruemotiveitwasn'tbecausetheywantedmetoimprovebutbecausetheywantedto13timewithme.Theywerejusttryingtosharea14partoftheirlifewithmeand15meinsomethingthathadbeeninthefamilyforever.16Igot.thisIstoppedtreatingitasworkand17itasabondingexperience. NowIoften18toplaybaseballwithmydadorgrandpa.The19practicesandtoughloveIgotfrommy20taughtmeausefullifelessonfindoutwhysomeonedoessomethingbeforejumpingtoconclusions. 1A.fairly B.successfully C.naturally D.accidentally 2A.still B.seldom C.even D.yet 3A.parents B.coaches C.doctors D.neighbors 4A.ordered B.prepared C.honored D.born 5A.amazed B.disappointed C.great D.mad 6A.casually B.accurately C.regularly D.clumsily 7A.practice B.relax C.leave D.quit 8A.reply B.reason C.chance D.choice 9A.project B.business C.routine D.policy 10A.effort B.wealth C.promise D.trust 11A.calmer B.smarter C.happier D.kinder 12A.searchedfor B.focusedon C.benefitedfrom D.figuredout 13A.save B.waste C.spend D.set 14A.normal B.special C.short D.general 15A.include B.spoil C.test D.judge 16A.Before B.Although C.Unless D.Once 17A.expected B.described C.treasured D.recognized 18A.fail B.offer C.forget D.hesitate 19A.forced B.regretted C.disturbed D.ended 20A.team B.school C.neighborhood D.family
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