《大学英语精读》PPT课件.ppt

1、unit 5 The Villain in the Atmosphere,Isaac Asimov,There is one gas present in the air we breathe that is essential to life. Unfortunately,one can have too much of a good thing and the growth in carbon dioxide threatens to warm up our planet to a dangerous extent.Isaac Asimov introduces us to this vi

2、llain in the atmosphere ,explaining how it works and what can be done about it,The villain in the atmosphere is carbon dioxide,It does not seem to be a villain.It is not very poisonous and it is present in the atmosphere in so small a quantity-only 0.034 precent-that it does us no harm,Whats more,th

3、at small quantity of carbon dioxide in the air is essential to life. Plants absorb carbon dioxide and convert it into their own tissue,which serve as the basic food supply for all of animal life(including human beings,of course).In the process they liberate oxygen,which is also necessary for all ani

4、mal life,essential,Essential :a. absolutely necessary;extremely important 必不可少的；非常重要的；必需的，基本的 Food is essential to life.食物是维持生命不可或缺的。 Her most essential quality is kindness.她最主要的品质是厚道。 essential ,necessary ,requisite都具有“必要”的意义，可以互相通用；但essential语气最强，表示“必不可少”，necessary次之，requisite语气最弱。 n. 要素，要点 One of

5、 the essential for success is diligent.成功的要素之一是勤奋,introduce to,introduce.to. 把.介绍给. He introduced his friend to me. 他把他的朋友介绍给我,threaten,threaten:威胁，恫吓，预示. 的恶兆，使有. 的危险 His father threatened to beat the boy if he stole again. 男孩的父亲威胁他说如果他再偷东西的话，就要揍他,poisonous,poisonous :a.containing or producing poiso

6、n 1有毒的，有害的，恶毒的 This medicine is poisonous if taken in large quantities. 这种药若服用过量是有害的。the remaining poisonous influence 余毒 be poisonous to sbs mind 对某人的思想有害 a poisonous rumor 恶毒的谣言 give sb. a poisonous look 恶狠狠地看某人一眼2 讨厌的，令人不悦的，使人无法忍受的The heat is simply poisonous. 热得令人无法忍受,poison,Poison:n. 1 毒药，毒物 us

7、e poison as an antidote(解毒剂) to poison 以毒攻毒 drink poison to quench(抑制) ones thirst 饮鸩止渴 2【作定语】 poison gas 毒气 a poison pen 写匿名信的人 3vt.使中毒，放毒于，毒杀，毒害，伤害Some one tried to poison our dogs food. 有人企图在狗食中下毒。 poison sbs mind 毒害某人的思想 poison the friendship of 破坏. 的友谊4a. hate each other like poison 互相恨透 Whats

8、your poison?(口)你要喝点什么,do harm,do (sbs) harm :cause damage or injury to (sb.) 对（某人）造成损害（或伤害） Staying up does us harm.熬夜对我们的健康造成伤害,whats more,whats more 而且 He is a tractor driver and,whats more a good sportsman. 他是一个拖拉机手，而且还是一个好运动员,convert,convert:v.change from one form or use to another (使)转变,(使)变成，变

9、换，常与into 连用 That building has been converted into a shool. 那座楼改成学校了。 convert coal to gas 将煤转化为煤气,tissue,tissue:n. Substance that animal and plant cells are made of;piece of soft thin paper used esp. for wiping your nose 组织，手巾纸，薄包装纸，棉纸She used paper tissues to blow her nose.她用棉纸擤鼻子。a tissues of lies一

10、整套谎话,serve as,serve as :vt. be used for a particular purpose起.作用，被用作，作.之用， The sofa served the boy as/for a bed. 那张沙发用作男孩的床。Vi. 可作.之用The box served as a table. 那只箱子用作桌子。This tool served for many purposes. 这件工具有很多用途,supply for,supply for:vt.1供应，提供The school supplies book for/to the children. 学校提供孩子们书籍。 2补充，满足Its hard to supply the demand for more and better houses. 要满足人们对于更多更好的房子的需求是很难的。 3供应量，【常用复】 What supplies will we need for our mountain climb?我们登山需要那些生活用品,liberate,li