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1、Unit3Scienceandnature全单元学案知识篇一、知识复习11.Ontheotherhand,somescientistspointoutthatifyoucloneanembryo,youcanproducevaluablehumantissues—suchasboneorlungtissue—thatcouldbeusedtosavehumanlives.Ontheotherhand,manypeople,includingsomescientists,disagreeandareafraidthat,i
2、fmankindtoyswithnatureinthisway,wemaybeonourwaytoproducingareal-lifeFrankenstein’smonster.(1)on(the)onehand…ontheotherhand…一方面……另一方面……Ononehand,rapiddevelopmentoftheeconomywillimprovethelivingconditionsofpeople.Ontheotherhand,itwillspeedupenvironmentaldestruction
3、.(短语)athand在手边,在附近byhand用手;亲手inhand手头现有的,正在进行,在处理中handin交上来handout分发handover移交handdown把……传下去handinhand手拉手(2)pointat,pointto和pointout的意思都与“指”有关,但还是有一定区别。pointat习惯上表示指向离说话人较近的事物,意为“指着”,at是介词,着重于指的对象。pointto多用来表示指向离说话人较远的事物,意为“指向”,to也是介词,着重于指的方向。pointat可分开使用,point后直
4、接跟名词或代词作宾语,at表示方向,而pointto却没有这种用法,但它还表示“显示、说明”的意思。pointout表示的是给某人指示方向,要点或错误等,意为“指出”,out是副词。根据句意,用pointat,pointto或pointout的适当形式填空。1.Theteacherispointingat/tothemaponthewall.2.Boththehourhandandtheminutehandpointtotwelve.Itwasnoon.3.Canyoupointoutthemanyoususpect?4
5、.Alltheevidencepointstohisguilt.5.Theypointedtheirgunsatherheadbutshewasnotafraid.35Onthepointofdoingsthwhen正要做某事……突然tothepoint击中要害aturningpoint转折点explain…pointbypoint逐点解释(3)toywith玩弄;不认真对待她指责那个年轻人玩弄她的感情。Sheaccusedtheyoungmanoftoyingwithherfeelings.那个小女孩只是把食物拨弄着玩
6、儿,因为她并不饿。Thelittlegirljusttoyedwithherfood,asshewasn’treallyangry.(4)onone’s(the)waytodoingsth.“正在做某事的过程中,即将成功,离……不远了”。to是介词,后接名词、代词或动名词短语。1.他即将成为一个导演。Heisonhiswaytobecomingadirector.2.期中考试就要临近了,因此他学习更加刻苦了。Themid-examinationisonitsway,soheisworkingharder.我正在去上学的路
7、上,这时我偶然遇到了我的一位朋友。Onthe/mywaytoschool,whenIcameacrossafriendofmine.A.(练习)I’vejustheardawarning______theradiothatastormmaybe____itsway.A.on,onB.over,inC.on,aboveD.from,on复习下列短语:intheway防碍,挡道bytheway顺便问问,顺便说说inaway在某种意义上,在某种程度上bywayof途经innoway决不alltheway一路上;至始至终make
8、wayfor为……腾出地方;让路makeone’swayto(辛苦地)前进2.Instead,hethinksresearcheffortsshouldconcentrateoncreatingnewtissuesandorgansthatcanbeusedtocurediseaseslikecancer.conce