【正文】 。 Darwin was convinced that the theory of evolution is based on natural selection. Ex121 A 2 D 3 B 4 B 5 C Ex131 classical, 2 breakthrough, 3 elegance, 4 faculty, 5 handful, 6 probe, 7 swift, 8 transition, 9 reactions, 10 retirementE141 has brought in, 2 under his belt, 3 specializes in, 4 a wealth of, 5 be applied toEx151. The lecturer at the conference turned out to be the daughter of an old friend of mine. 2. It has been 5 years since his retirement, but he has remained active in the academic circles.3. If you do have financial difficulties, you can apply for a student loan.4. This scientist had worked hard at this new material for as long as ten years before he made his own way in the end.5. The chief airplane manufacturers in the world are pushing the envelope to make faster and longer range airplanes to pete for bigger share of the market.Ex171 他有耐心和毅力，使他做事時(shí)堅(jiān)持的時(shí)間比其他大多數(shù)孩童都長。（根據(jù)上下文，增加原文中省略的詞語） 2 就其基本內(nèi)容而言，這一學(xué)說提出的論點(diǎn)包括：光速是宇宙中最快的速度；…（增加修飾語，以示強(qiáng)調(diào)） 3扎威爾將收到世界各地的來信。短短幾天時(shí)間里2000封電子郵件接踵而至。（增加量詞以及原文上下文中所省略的部分）4 但是，這位53歲的科學(xué)家將首先與家人共享這條喜訊。（增加原文上下文中所省略的部分）Unit3 Leadin 4 3 6 2 1 5 Ex31 A 2 B 3 C 4 A　5 BEx4advertising, brand, promoted, proved, popular, expression, global, immigrantsEx51法國已經(jīng)保證明年提供數(shù)十億美元的援助。2 你不應(yīng)對(duì)不可能做到的事做出保證。 3 老板向他保證并沒有解雇他的打算。 4 檢查一下他的眼睛，以保證沒有問題，是明智之舉。 5 已經(jīng)采取了措施來保證學(xué)生不會(huì)因經(jīng)濟(jì)原因而輟學(xué)。 6 生產(chǎn)商必須按規(guī)定保證其產(chǎn)品質(zhì)量。 Ex61 attained 2 modest 3. attractive 4 precise 5 campaign 6 market 7 manufactures 8 sponsor 9 imported 10 brandsEx71 frown (very much) on 2 for instance 3 as a result 4 when it es to 5 under … umbrellaEx81 Thoughts are expressed by means of language.2 I have bought so many new books this year that it’s really difficult for me to keep count of them.3 The old lady feels assured that her son will e back home today to celebrate her birthday.4 His mother insisted that his pocket money should not exceed 100 yuan per month.5 We bought a car last month, which was registered under my name.Ex91 For most American teenagers, when it es to fortable and fashionable clothing, nothing beats Tshirts and jeans.2 Starting in 2004, Adidas widely promoted that “impossible is nothing,” and the notion took hold.3 When the news was first released online, the number of its viewers beat the imagination.4 The girl’s big break came with her outstanding performance at the singing contest.5 In many European countries people tend to frown on in public places.Ex121 C 2 D 3 C 4 A 5 BEx131 revenues 2 targeting 3 appliances 4 via 5 smashing 6 loyal 7 parable 8 alongside 9 claiming 10 filmedEx141 beat…expectation 2 so far 3 built up 4 at home 5 on…basisEx151 A great man can dominate a difficult situation by force of character.2 According to the latest report, tourists do not have to apply for an entry visa to some Southeast Asian countries.3 The color of the envelope suggests that the letter might be from a woman.4 Trains can’t rival planes for speed, but many people prefer to travel by train.5 People are much more likely to accept this mode of administration once they see that it really works.Ex161 The prime minister of Japan2 Aides3 The pressEx171 天未下雪，但葉落草枯。2 那時(shí)打我并且使我挨餓的不只是一個(gè)老太婆，而是老老少少各式各樣的人。3 我們能測量罐內(nèi)的水量，但不能測量水的熱度，我們還沒有這種儀器。4 溫度增高，水的體積就增大。5他的望遠(yuǎn)鏡和實(shí)驗(yàn)總是給他帶來驚奇的新發(fā)現(xiàn)，他每天都把工作情況記錄下來。Unit 4 Leadin1 got me wondering 2 it hit me 3 original me 4 bank statement 5 overdue books 6 unexplained chargesEx31 C 2 B 3 C 4 DEx4famous, promoting, religious, desperate, shortage, inevitable, failureEx51 1) 2 2) 3 3)12 1) 3 2) 2 3)23 1) 2 2) 3 3)2Ex61 string 2 stir 3 controversy 4 bat 5 excessive 6 regulations 7 instincts 8 reckless 9 prohibition 10 irrationalEx71 to his name 2 keep at bay 3 under the sun 4 jumped the gun 5 lined upEx81 The band shot to fame in the 1980s with that single album.2 Take a risk, and you may lose again, but you would have improved your chances to win.3 Scientists are pushing themselves to the limits in their research for finding a cure for AIDS.4 Now we see the point of the Internet: we can get informat