《大學英語精讀》PPT課件.ppt

unit5TheVillainintheAtmosphere,IsaacAsimov,Thereisonegaspresentintheairwebreathethatisessentialtolife.Unfortunately,onecanhavetoomuchofagoodthingandthegrowthincarbondioxidethreatenstowarmupourplanettoadangerousextent.IsaacAsimovintroducesustothisvillainintheatmosphere,explaininghowitworksandwhatcanbedoneaboutit.,Thevillainintheatmosphereiscarbondioxide.,Itdoesnotseemtobeavillain.Itisnotverypoisonousanditispresentintheatmosphereinsosmallaquantity-only0.034precent-thatitdoesusnoharm.,Whatsmore,thatsmallquantityofcarbondioxideintheairisessentialtolife.Plantsabsorbcarbondioxideandconvertitintotheirowntissue,whichserveasthebasicfoodsupplyforallofanimallife(includinghumanbeings,ofcourse).Intheprocesstheyliberateoxygen,whichisalsonecessaryforallanimallife.,essential,Essential:a.absolutelynecessary;extremelyimportant必不可少的；非常重要的；必需的，基本的Foodisessentialtolife.食物是維持生命不可或缺的。Hermostessentialqualityiskindness.她最主要的品質是厚道。essential,necessary,requisite都具有“必要”的意義，可以互相通用；但essential語氣最強，表示“必不可少”，necessary次之，requisite語氣最弱。n.要素，要點Oneoftheessentialforsuccessisdiligent.成功的要素之一是勤奮。,introduceto,introduce.to.把.介紹給.Heintroducedhisfriendtome.他把他的朋友介紹給我。,threaten,threaten:威脅，恫嚇，預示.的惡兆，使有.的危險Hisfatherthreatenedtobeattheboyifhestoleagain.男孩的父親威脅他說如果他再偷東西的話，就要揍他。,poisonous,poisonous:a.containingorproducingpoison1有毒的，有害的，惡毒的Thismedicineispoisonousiftakeninlargequantities.這種藥若服用過量是有害的。theremainingpoisonousinfluence余毒bepoisonoustosbsmind對某人的思想有害apoisonousrumor惡毒的謠言givesb.apoisonouslook惡狠狠地看某人一眼2討厭的，令人不悅的，使人無法忍受的Theheatissimplypoisonous.熱得令人無法忍受。,poison,Poison:n.1毒藥，毒物usepoisonasanantidote(解毒劑)topoison以毒攻毒drinkpoisontoquench(抑制)onesthirst飲鴆止渴2【作定語】poisongas毒氣apoisonpen寫匿名信的人3vt.使中毒，放毒于，毒殺，毒害，傷害Someonetriedtopoisonourdogsfood.有人企圖在狗食中下毒。poisonsbsmind毒害某人的思想poisonthefriendshipof破壞.的友誼4a.hateeachotherlikepoison互相恨透Whatsyourpoison?(口)你要喝點什么？,doharm,do(sbs)harm:causedamageorinjuryto(sb.)對（某人）造成損害（或傷害）Stayingupdoesusharm.熬夜對我們的健康造成傷害。,whatsmore,whatsmore而且Heisatractordriverand,whatsmoreagoodsportsman.他是一個拖拉機手，而且還是一個好運動員。,convert,convert:v.changefromoneformorusetoanother(使)轉變,(使)變成，變換，常與into連用Thatbuildinghasbeenconvertedintoashool.那座樓改成學校了。convertcoaltogas將煤轉化為煤氣,tissue,tissue:n.Substancethatanimalandplantcellsaremadeof;pieceofsoftthinpaperusedesp.forwipingyournose組織，手巾紙，薄包裝紙，棉紙Sheusedpapertissuestoblowhernose.她用棉紙擤鼻子。atissuesoflies一整套謊話,serveas,serveas:vt.beusedforaparticularpurpose起.作用，被用作，作.之用，Thesofaservedtheboyas/forabed.那張沙發(fā)用作男孩的床。Vi.可作.之用Theboxservedasatable.那只箱子用作桌子。Thistoolservedformanypurposes.這件工具有很多用途。,supplyfor,supplyfor:vt.1供應，提供Theschoolsuppliesbookfor/tothechildren.學校提供孩子們書籍。2補充，滿足Itshardtosupplythedemandformoreandbetterhouses.要滿足人們對于更多更好的房子的需求是很難的。3供應量，【常用復】Whatsupplieswillweneedforourmountainclimb?我們登山需要那些生活用品？,liberate,liberate:vt.free(sb./sth.)fromasituationinwhichtheyarerestrictedinsomeway釋放，解放，解救liberateslaves解放奴隸Hishometownwasliberatedin1948.他的家鄉(xiāng)是在1948年解放的。,謝謝,