高一英语必修3Unit4Astronomy:thescienceofthestars人教实验版【本讲教育信息】一、教学内容必修3Unit4Astronomy:thescienceofthestars（一）重点单词（二）重点短语（三）重（难）点句型二、知识精讲（一）重点单词1.systemn.[c]系统；体系；制度systematicadj.Hecreatedanewsystemofteachingforeignlanguages.他创造了一种新的外语教学体系。Thenewsystemhashadadisastrouseffectonproductivity.新制度对生产率产生了灾难性的影响。Toomuchalcoholisbadforthesystem.过量饮酒对身体有害。theoryn.学说；理论theoreticadj.Therearemanytheoriesabouttheoriginoflife.关于生命起源的学说有很多。Inthiswaytheycanbetterapplytheorytopractice.这样他们就能更好地把理论运用到实践中去。Yourplansoundsfineintheoryitdoesn’tworkinpractice.你的计划在理论上听起来不错，但在实践中无法实施。2.violentadj.猛烈的；激烈的；粗暴的violencen.Theyarelaunchingaviolentattackontheenemy.他们对敌人展开了猛烈的进攻。Theclasswasshockedbyhisviolentlanguage.全班同学对他激烈的言辞感到震惊。Childrenshouldnotbeallowedtowatchviolentmovies.不应允许儿童看暴力电影。Theyoungmanwaschargedwithrobberywithviolence.这个年轻人被控暴力抢劫。3.unlike（1）prep.与……不像，与……不同Unlikehisbrother,hehasasenseofhumor.与他的兄弟不同，他很有幽默感。It’sunlikeyounottosayhello.连招呼都不打，这可不像是你（的作风）。（2）adj.不同的,相异的,不相似的Theygiveunlikeaccountsoftheincident.他们对这件事的描述各不相同。4.fundamentaladj.基本的；基础的；必要的Thereisafundamentaldifferenceinattitudebetweenthetwopoliticians.这两位政治家的态度有着根本区别。Freshairisfundamentaltogoodhealth.新鲜空气对健康是不可缺少的。5.harmfuladj.对……有害的harmlessadj.Itisobviousthatsmokingisharmfultohealth.很显然，吸烟对健康有害。知识拓展harmn.损害,危害,伤害；vt.(使)受到损害,伤害Excessivedrinkingwillbeharmfultoyou./doyouharm./doharmtoyou./harmyou.过量饮酒对身体有害。6.existvi.存在；生存existencen.存在Mancan’texistwithoutoxygen.人没有氧气就不能生存。IcanhardlyexistonthewageI’mgetting.我靠我挣的工资简直难以糊口。Thereexistsagoodwaytosolvetheexistingproblem.有一个解决目前问题的好办法。Nooneknowshowthisworldcameintoexistence。没有人知道这个世界是怎样形成的。7.puzzle（1）n.谜，难题；令人费解的事[人]Theirreasonfordoingitisstillapuzzletome.他们为什么干那件事仍然让我费解。It’saquitepuzzletouswhyhedidit.他为何做这样的事，我们完全搞不懂。（2）vi.&vt.(使)迷惑；（使）为难Whatpuzzledmewaswhytheydidn’ttakeheradvice.他们为什么不接受她的建议，这使我大惑不解。知识拓展puzzling令人困惑的puzzled感到困惑的Wefeltpuzzledatthesepuzzlingquestions.我们对这些令人困惑的问题感到茫然。即学即用①Atlast,Imadeupmymindtospeakthetruth______ofthewholeclass.A.inthepresentB.atthepresentC.inthepresenceD.atthepresence②Theyhada______quarrelandJohnstormedout.A.violentB.cruelC.strongC.harmful③Hisnewnovelis______allhispreviousones.A.unlikeB.notlikelyC.unlikelyD.likely④Judgingfromhis______look,thisproblemmustbequite______.A.puzzling;puzzlingB.puzzled;puzzledC.puzzling;puzzledD.puzzled;puzzling⑤Wedon’townthebuilding._____,itwouldbeimpossibleforustomakeanymajorchangestoit.A.ThusB.YetC.StillD.Even⑥Astrangevirusstruckmycomputer_____sothatitbrokedown.A.designB.systemC.theoryD.instrument⑦Atruckwentoutofcontroland______intothebackofabus.A.crackedB.crashedC.brokeD.burst⑧Scientistsarenotsureaboutthe_____ofwateronMars.A.appearanceB.existenceC.connectionD.possibility（二）重点短语1.Theywereintimetoproducecarbon,nitrogen,watervaporandothergases,...
