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如图所示，一个空的塑料药瓶，瓶口扎上橡皮膜，竖直地放入水中，一次瓶口朝上（如图甲），一次瓶口朝下（如图乙），这两次药瓶在水里的位置相同． （1）每次橡皮膜都向内凹，这是因为 ．同时橡皮膜凹陷，...
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将一个空塑料药瓶的瓶口扎上橡皮膜然后把它竖直地浸入水中一次瓶口朝上一次瓶口朝下两次药瓶在水里的位置相
将一个空塑料药瓶的瓶口扎上橡皮膜然后把它竖直地浸入水中一次瓶口朝上一次瓶口朝下两次药瓶在水里的位置相
一个空的塑料药瓶瓶口扎上橡皮膜竖直浸入水中一次瓶口朝上一次瓶口朝下这两次药瓶在水里的位置相同如图则
一个空塑料药瓶瓶口扎上橡皮膜竖直地浸入水中一次瓶口朝上一次瓶口朝下这两次药瓶在水里的位置相同如图所示
一个空的塑料药瓶瓶口扎上橡皮膜竖直浸没在水中第一次瓶口朝上第二次瓶口朝下两次药瓶在水里的位置相同哪一
如图所示一个空的塑料药瓶瓶口扎上橡皮膜竖直地浸没水中一次瓶口朝上一次瓶口朝下这两次药瓶在水里的位置相
甲．乙图橡皮膜都向内凹，乙图中橡皮膜凹进得更多
甲．乙图橡皮膜都向外凸，乙图中橡皮膜凸出得更多
甲图橡皮膜向内凹．乙图橡皮膜向外凸
甲图橡皮膜向外凸．乙图橡皮膜向内凹
如图所示一个空的塑料药瓶瓶口扎上橡皮膜竖直地浸入水中一次瓶口朝上一次瓶口朝下这两次药瓶在水里的位置
如图所示一个空的塑料药瓶瓶口扎上橡皮膜竖直地浸入水中一次瓶口朝上一次瓶口朝下这两次药瓶在水里的位置
一个空药瓶瓶口扎上橡皮膜竖直地浸入水中一次瓶口朝上一次瓶口朝下两次药瓶在水里的位置相同如图所示下列
瓶口朝上时向内凹，瓶口朝下时向外凸，形变程度相同
瓶口朝上时向内凹，瓶口朝下时向外凸，朝下时形变更多
两次都向内凹，形变程度相同
两次都向内凹，瓶口朝下时形变更多
找一个空的小玻璃药瓶在瓶口上绷扎橡皮膜然后竖直地浸入盛有水的大玻璃杯中一次瓶口朝上一次瓶口朝下如图所
液体对浸在其中的物体会产生向下的压强，也会产生向上的压强
深度越深，液体产生的压强越大
将一个空塑料药瓶在口中扎橡皮膜然后把它竖起地浸入水中一次瓶口朝上一次瓶口朝下两次瓶在水里的位置相同如
一个空塑料药瓶瓶口扎上橡皮膜竖直地浸入水中第一次瓶口朝上第二次瓶口朝下这两次药瓶在水里的位置相同如图
瓶内空气的密度变大
瓶内空气的压强不变
橡皮膜所受水的压强变大
若甲图中药瓶处于悬浮状态，则乙图中药瓶会下沉
如图所示一个空的塑料药瓶瓶口扎上橡皮塞竖直浸入水中第一次瓶口朝上第二次瓶口朝下两次药瓶在水里的位置相
第一次
第二次
两次凹陷得一样
橡皮膜不会向瓶内凹陷
一个空塑料药瓶瓶口扎上橡皮膜竖直地浸入水中一次瓶口朝上一次瓶口朝下这两次药瓶在水里的位置相同如图所
一个空的塑料药瓶瓶口扎上橡皮膜竖直浸没在水中第一次瓶口朝上第二次瓶口朝下两次药瓶在水里的位置相同哪一
如图所示一个空的塑料药瓶瓶口扎上橡皮膜竖直浸入水中第一次瓶口朝上第二次瓶口朝下两次药瓶在水里的位置相
第一次
第二次
两次凹陷得一样
橡皮膜不会向瓶内凹陷
一个空的塑料药瓶瓶口扎上橡皮膜竖直地浸入水中一次瓶口朝上一次瓶口朝下这两次药瓶在水中的位置相同如图所
一个空塑料药瓶瓶口扎上橡皮膜竖直地浸入水中一次瓶口朝上一次瓶口朝下这两次药瓶在水里的位置相同如图所示
如图所示一个空的塑料药瓶瓶口扎上橡皮膜竖直浸入水中第一次瓶口朝上第二次瓶口朝下两次药瓶在水里的位置
深度越大水的压强越大
此时水向上的压强大于水向下的压强
水向上和向下都有压强
如果没有橡皮膜，水也就不会产生压强
如图所示一个空的药瓶瓶口扎上橡皮膜一次瓶口朝上一次瓶口朝下沉在装水的容器底部两次药瓶在水中所处的位
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中国将不会放弃搜寻失联飞机MH370.giveup.
某同学在学习完实验室制取氧气的相关知识后进行了如下归纳与整理其中你认为不正确的是
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下列变化属于化学变化的是
Nowthereisafamilyproblem.Nearlyeveryparentsaysthatwenevergrowup.Infactweareprobably14or15yearsold.Intheireyeswearealwayslittleonesandoftendowrongthings.ForexamplewhenIneedtostayathomealonetheyalwaysworryaboutmeandmylifewithoutthem. Mostparentsalwaysthinkthattheyhaveofferedthebestthingstheycantomaketheirchildrenliveinacomfortableworld.Theybuytheirchildrenprettyclothescoolshoeseverythingthattheycanfortheirdearchildren.Inreturntheyonlywanttheirchildrentogetgoodresultsintheexams. Butwhystillcan'ttheirchildrenunderstandthem?Doesitmeanthatwestillwantmorematerial物质things?No.Asamatteroffactwhatwewantisatruefamily.Whatdoesatruefamilymean?Ithinkitmeansaplacewherewecanhideourselvesfromthecoldworldoutside.Fromherewecangetwarmthwecangetconsolation安慰andwecangethappiness.Andoneimportantthingisthatweshouldbestrongerandmoreconfident自信的intheoutsideworldbecauseweknowthatwehaveatruefamily. SoIthinkthatparentsshouldsitdowntotalkwiththeirchildrentoletthemknowthattheyhaveatruefamilysothechildrenandtheirparentscouldunderstandoneanothermoreandmore.Thenparentswillnottreattheirchildrenaslittleones. 41.Inourparents'eyeswe. A.wehavegrownup B.weneverdoanythingwrong C.Wearealwayslittleones D.weshouldn'tworrythem 42.Whatdomostparentswanttogetfromtheirchildren? A.Goodresultsintheexams. B.Thebestthings. C.Prettyclothes. D.Coolshoes. 43.Whatdothechildrenreallywant? A.Morematerialthings. B.Atruefamily C.Nothingatall. D.Acomfortableworld. 44.Whatcanwegetfromatruefamily? A.Warmthandconsolation. B.Happinessandstrength. C.Confidenceandunderstanding. D.Alloftheabove.
﹣Toachieveabrightfutureweshouldstudyhardkeephealthy ﹣Iagreewithyou. A.notonlybutalso B.notbut C.neithernor D.eitheror
DearRichard I'mgladyou'recomingtoChina!①Yourmothertellsmeyou'reworriedaboutwhatyoushouldandshouldn'tdoasaguestinChina.HereissomeadviceoneatingcustomsinChina. You'llprobablybeinvitedtoadinner.Therewillbealotofdishesnotjustthreecourses.Youmayfinditdifficulttousechopsticksifyouhaven'ttriedbefore.It'sagoodideatogetsomepracticebeforehand.Whenthefoodisservedyoushouldwaituntilyou'reinvitedtoeat.Theplateswillbeplacedinthemiddleofthetableforeverybodytoshare.Takealittleofeverythingandthenhavesomemoreofthethingsyoulike. Toprepareabigmealtakesalongtimeandeverythinglooksbeautifulsoit'sagoodtopicofconversation.You'dbetterjoinintheconversationandsayhowmuchyoulikeit. Attheendofthemealyouwillusuallybeservedwithfruit. Ihopethisishelpful.Emailmeifyouhaveanyotherquestions. Yours ZhangDawei 任务一:PuttheunderlinedsentencesintoChinese.将画线的句子译成汉语 72.① 73. 74.HowmanycoursesareusualforadinnerintheWest?. 75.IsitagoodideatotalkaboutfoodduringamealinChina?Why? 76..
Jennyyoushouldpracticeasoftenasyoucanthepianocompetition. A.fail B.tofail C.win D.towin
1下列物质①冰水混合物②洁净的空气③液氧④5%的过氧化氢溶液． 属于纯净物的是填序号下同属于混合物的是 2如图放置在桌面上的是某同学用排水法收集的无色气体请推断该气体还具有的物理性质① ②
﹣WhenaretheyleavingforNewYork? ﹣Theyaregoingtosometimenextweek. A.setoff B.getoff C.falloff D.takeoff
甲同学取a克氯酸钾乙同学取氯酸钾和二氧化锰的混合物按质量比31a克二人同时进行加热．下列图示中能正确反映生成氧气质量Y与加热时间X关系正确的是
阅读下面的短文用括号内所给词的适当形式填空必要时可加助动词.请将答案填写在文后相应的横线上. Onceuponatimetherewasatravelerwhohadaabighorseandasmalldonkey.Whilehewastravelingthehorseandthedonkeycarriedallkindsofthingson56theybacksforhim.Thebighorsewasverystrongbuthecarriedas57heavyasthesmalldonkey. At58onethedonkeywasabletokeepupwiththebighorse.Butaftersometimehedonkeybegantofeeltootired59keepupanymore.SothedonkeyaskedthehorseBrotherHorsecouldyoupleasehelpme?IamafraidIcan'tgoon60carrymyload负荷物. Noyoucarryyours.Icarry61my.Itisnotmyproblemthatyouarenotasstrongandbigasmeansweredthehorse62feelveryproudthathewas63strong. Notlongafterthatthedonkeyatlast64falldowntothegroundanddied. Their65ownmovedwhatthedonkeycarriedontothebackofthehorse.Nowthehorsehadtocarrythedoubleloadfortherestofthejourneyandheregretted后悔whathedidtothedonkey.IfIhadhelpedthedonkeyoutat66littlehecouldcarrysomething.thehorsesaidto67he.Butitwastoolate. 56. 57. 58. 59. 60. 61. 62. 63. 64. 65. 66. 67.
有下列物质①冰水混合物②氧气③过氧化氢溶液完全分解后所得液体④洁净的空气⑤五氧化二磷⑥高锰酸钾分解的固体剩余物．用序号填空 1属于混合物的有2含有氧分子的有．
﹣WhynotlistentoBBCnewstoimproveyourlisteningskills? ﹣It'sdifficultIcan'tfollowit. A.such;that B.so;that C.too;to D.so;to
IfyoudoyourbestI'msureyou'lldoitwell. A.can B.could C.areableto D.beableto
Thisisnotadiet.It'sasimplewaytoloseweight.Andyoudon'tevenhavetogiveupthefoodyouloveorjoinagym.Youjustfollowsomehabitsthatthinpeoplehave.Keepthemandyou'llbecomethin. 1Wake﹣up Whenyouwakeupinthemorningsitupslowlywithoutusingyourhands.Withlegsstraightoutbend弯曲forwarduntilyoufeelsoreinyourback.Itwillburnabout10calories热量单位卡路里. 2Startwithsoup Whenyouhaveamealorderaclearsoupandhaveitbeforehavingthemainfood.Inthiswayyou'llfeelfullersoyou'lleatlesswhenthemainfoodcomes. 3Anappleormoreaday Applesarefulloffiber纤维andwatersoyourstomachwillwantless.Thestudyshowsthatpeoplewhoeatatleastthreeapplesadayloseweight. 4Standupandwalkaround Everytimeyouusethemobilephonestandupandwalkaround.Heavypeoplesitonaverage平均twoandahalfhoursmoreeachdaythanthinpeople.Thisskillisveryimportantasstandingupandwalkingaroundwillburn50ormorecalories. Usetheseskillsandyouwillhaveabigweightloss. 41.Whichofthefollowingmaytheauthordisagree? A.Sittingupslowlywithoutusingyourhandshelpsburncalories. B.Eatingappleseverydayisgoodforpeople'shealth. C.Youhavetojoinagymifyouwanttoloseweight. D.It'sgoodtowalkaroundwhiletalkingonthemobilephone. 42.What'thepurposeofthepassage? A.Togivesomeadviceonhowtoloseweight. B.Toadvisepeopletoeatappleseveryday. C.Totellpeoplehowtoenjoyabetterlife. D.Toadvisepeopletogiveupbadhabits. 43.Inwhichpartofanewspaperwouldyoumostprobablyreadthepassage? A.Shopping. B.Teaching. C.Family. D.Health.
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下列有关氧气的说法正确的是
图1和图2是两个设计证明分子运动的实验．在图2的锥形瓶中的小瓶里装着浓氨水锥形瓶口用一张滤纸盖住滤纸刚刚用酚酞溶液浸过． 1图1中观察到的现象是可以得到的结论是． 2在图1中的大烧杯外放一杯酚酞溶液的目的是． 3利用图2与1相比较它的优点是．答一点即可
Becareful!Somepeoplemayusethetruthtodeceive欺骗.Whensomeonetellsyousomethingthatistruebutmissesimportantinformationthatshouldbeincludedhecancreateafalse不真实的impression. ForexamplesomeonemightsayI'vejustwon100dollarsonthelottery彩票.Itwasgreat.Itookthatticketbacktothestoreandtheygaveme100dollars! Thismanwasawinnerwasn'the?Maybemaybenot.Wethendiscoverthathepaid200dollarsfor200ticketsandonlyoneticketwon.He'sreallyabigloser. Hedidn'tsayanythingthatwasfalsebuthedidn'tgivetheotherimportantinformation.That'scalledahalf﹣truth.Half﹣truthsarenotliesbutinfacttheyaredishonest. Advertisementssometimesusehalf﹣truths.It'sagainstthelawtolieinadvertisementssotheytrytodeceivewiththetruth.AnadvertisementmightsayNine﹣tenthsofstudentssaidthatanewkindofdevice仪器isgoodforthemtorememberwords.Itdoesn'ttellyouthattheyonlyaskedtenstudentsandnineofthemusethiskindofdevice. Thiskindofthinghappenstoooften.It'sasadfactoflife:Liesareliesandsometimesthetruthcanlieaswell. 52.Whenpeopletellpartofthetruth. A.theyarereallylying B.theyarelotterylosers C.theymaynotbehonest D.theymaywantyoutobuysomething 53.WhichofthefollowingisTRUE? A.Thetruthcanbeusedbydishonestpeople. B.Allliesarehiddeninthetruth. C.Nine﹣tenthsofdoctorsworkforFancyCompany. D.Advertisementsarefulloflies. 54.Thewriterwritesthispassagetotellusto A.Thinkcarefullywhentheyreadorhearsomething. B.Spendnomoneyonlotterytickets. C.Nevertrustanyonenomatterwhattheysay. D.Alwaystellthetruth. 55.Whichisthebesttitleforthepassage? A.TelltheTruth B.EverybodyLies C.LieWiththeTruth D.LiesAreLies.
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学生在学校不允许使用手机.beallowedtodo.
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下列事实与对应的解释相符的是
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