最新北师大版数学二年级下册《买电器》课件PPT版课件PPT.ppt 31页

'北师大版数学二年级下册《买电器》课件PPT版 学习目标：1.探索并掌握整百、整十数的加减法的口算方法，并能正确地计算。2.发展提出问题和解决问题的意识和能力，体会数学与生活的密切联系。 口算16＋20＝3654＋7＝6140＋40＝8019＋5＝2421＋8＝2936＋5＝4148＋10＝5830＋23＝5373＋23＝9623＋37＝60 万千百十个5个百加8个百是13个百，也就是1300。 （1）1台洗衣机比1台电视机便宜多少元？（2）1台电冰箱比1台电视机贵多少元？800–500=300（元）答：便宜300元。960–800=160（元）答：贵160元。（3）你还能提出哪些数学问题？并解答。 960—800=160900—800=100+60 练一练670–60730+5001800+200670–600730–5001800-200=70=610=1230=230=2000=1600 在里填上><或=。280+300○280+30750+40○40+7506400-400○6400-400960-80○900-80>=>= 总结：通过本节课的学习，同学们能够正确地计算整百、整十数的加减法算式了吗？大家课下可以互相出题，并一起讨论、解决。 数学游戏你说我算。两个数的和是500。450+50=500两个数的差是700。726–26=700 谢谢！祝同学们生活愉快！ 高二英语Unit5Book5复合句中的省略 I.时间、条件、让步、方式状语从句中的省略在when,while,until,though/although,if,unless,once,asif/though,whenever等连接的状语从句中，当从句主语跟主句主语相同，可省略从句的_____和_______；当从句主语为it时，可省略___和_______。主语be动词itbe动词 Task1:请用括号标出下列句子中可省略的部分。1.Hefeelsemptywhileheisnotatthecomputer.2.Whenitistakenaccordingtothedirections,thedrughasnosideeffects.3.Heopenedhismouthsseveraltimesasifhewastosaysomething.4.AlthoughIaminvited,Iwon’tgothere.5.Wheneveryouareintrouble,turntomeforhelp.6.Ifitispossible,I’dliketogooutforawhile. Task2:请把下列句子中已省略部分还原。1.Lookoutforcarswhen____________crossingthestreet.2.Shetalkedwhile__________preparingtheirsupper.3.Helookedaroundasthough___________________waitingforsomeone.4.Though__________poorlyfurnished,theroomiscleanandtidy.5.Whenever_________known,suchfactsshouldbereported.6.If______necessary,I"llhavethelettercopied.youareshewashewas/wereitistheyareitis Task3:请用从句的省略形式翻译下列句子。1.一旦被发现，你将会被惩罚。____________,youwillbepunished.2.虽然遭遇困难，他并不向命运屈服。(expose)___________________todifficulties,hedidn’tsubmittothefate.3.她匆匆忙忙离开房间，似乎生气了。(angry)Shehurriedlylefttheroom__________.4.他会保持沉默，除非有人问他。____________,hewillkeepsilent.5.无论何时有可能，你应该练习说英语。__________________,youaresupposedtopracticespeakingEnglish.6.如果方便的话，我想去拜访您。_____________,I’dliketovisityou.OncefoundAlthoughexposedasifangryUnlessaskedWheneverpossibleIfconvenient Task4:请修改以下病句。WhenIwaswalkinginthestreet,oneofmyshoesgotstuckinahole.1.Whenwalkinginthestreet,oneofmyshoesgotstuckinahole.2.Musiccanrelaxusifstressed.Musiccanrelaxusifwearestressed.3.Ifnottakingseriously,thesituationwillgetworse.Ifnottakenseriously,thesituationwillgetworse.4.Iamusedtolisteningtomusicwhileworked.Iamusedtolisteningtomusicwhileworking. Task4:请修改以下病句。5.Thestickinthewaterlooksasifwerebroken.Thestickinthewaterlooksasifitwerebroken.Thestickinthewaterlooksasifbroken. Task4:请修改以下病句。6.Onceitpublished,thebookwillbeverypopular.Onceitispublished,thebookwillbeverypopular.Oncepublished,thebookwillbeverypopular. II.比较状语从句中的省略在than或as…as引导的从句中，一些成分在上下文清楚的情况下被省略。 Task5:翻译下列句子。1.Hehasmadegreaterprogressthan(hedid)before/ever.2.Hecamehomeearlierthan(hewas)expected.3.Sheworksashardasyoungpeople(do).他取得了比以前更大的进步。他来得比预计得早些。她工作和年轻人一样努力。 III.限制性定语从句中的省略在_______定语从句中，关系代词作____时，可省略关系代词。但是，关系代词前有____时，不能省略。限制性宾语介词 Task6:下列句子中，有些引导词可以省略，请用括号标出可以省略的引导词。1.HewhohasneverbeentotheGreatWallisnotatrueman.2.SheisthegirlwhoIwillneverforget.3.Ifdreamsdie,lifeisabroken-wingedbirdthatcanneverfly.4.MrSmith,whomIhavelearnedalotfrom,isafamousscientist.5.Sheiswillingtogiveeverythingthatshehastoyou.6.Shetookphotographsofthethingsinwhichshewasinterested.()() IV.宾语从句中的省略单个that引导的宾语从句中，引导词that可以省略。多个that引导的宾语从句中，只能省略______引导词that。第一个 Task7:下列句子中，有些引导词可以省略，请用括号标出可以省略的引导词。1.Hehastoldmethatwewillhavetwodaysoff.2.Thenewsisthatwewillhavetwodaysoff.3.Itisexcitingthatwewillhavetwodaysoff.4.Weareexcitedatthenewsthatwewillhavetwodaysoff.5.Hetoldmethathehadtwosonsandtheybothhadgonetocollege.()表语从句引导词不能省主语从句引导词不能省同位语从句引导词不能省that 1.Themanwefollowedsuddenlystoppedandlookedasif________(see)whetherhewasgoingintherightdirection.2.Tomraisedhishandasif_____(say)something.4.Hestaredatthegirlasif______(see)herforthefirsttime.5.Theplayerisrollingonthegroundasif____(hurt)badly.6.I’msureallwillgowellas________.(plan)toseetosayseeinghurtplanned 1.Theresearchissodesignedthatonce_______(begin)nothingcanbedonetochangeit.2.Theeighteen-storiedbuilding,when________(complete),willshutoutthesunlightinguptheroomsinmyhouse.3.IfyougotoBritain,you’llfindthestreetstherelessbeautifulthancommonly_______.(suppose)4.Whenfirst________(introduce)tothemarket,theseproductsenjoyedgreatsuccess.5.Itshamesmetosayit,butItoldaliewhen________(question)atthemeetingbymyboss.beguncompletedsupposedintroducedquestioned 6.Generallyspeaking,when________(take)accordingtothedirections,thedrughasnosideeffect.7.Unless________(invite)tospeak,youshouldremainsilentattheconference.8.Though________(lack)money,hisparentsmanagedtosendhimtouniversity.9.When_______(offer)help,oneoftensays“thankyou."or“Itiskindofyou”.10.If______(give)moreattention,theboycouldhaveturnedoutbetter.takeninvitedlackingofferedgiven'