自学考试英语考前重点复习(unit24)自学考试英语考前重点复习(unit24)Text A Saving the Rainforests for Future GenerationsⅠ.New words：带有前缀的单词：deforestation： v.& n. 开伐森林ecosystem： n. 生态系统ecospecies：生态种overpopulate： v. 使人口过密population： n. 人口international：国际的nation： n. 国家，民族inter- 表示“在一起，交互”之义export： n. & vt. 输出，出口port：港口import：进口recycle： vt. 使再循环，使再生;n.再循环，再生economy n. 经济economic a. 经济(上)的economics n. 经济学economical a. 节约的consequence： n. 结果，后果consequent： a. 作为结果的massive： a. 大量的;大而重的，魁伟的mass： n. 群众，大量regional： a. 地区的region： n. 地区globe： n. 地球global： a. 全球的contribute： v. 贡献，捐献contribution： n. 贡献，捐献，投稿contributor： n. 捐助者，贡献者senseless： a. 无知觉的;无意义的，愚蠢的living： n. 生活，生计make one's living 谋生newly： ad. 新近，最近;重新，以新的方法合成词：rainforest： n. 热带雨林rainfall： n. (降)雨量;一场雨greenhouse： n. 温室forestland： n. 林地make-up： n. 组成，化妆课文中出现的重点单词：1.upset v. 弄翻，打翻;使苦恼过去式、过去分词：(upset-upset-upset )a. 不安的;不适的;不舒服的E.g.： The large wave upset the boat.He is upset because of the generation gap.2.contribute (vi./vt)E.g.： The Nobel Prize winner contrib uted much to the research in this field.contribute to：有助于;捐献;起作用His carelessness contributed to the a ccident.3.derive v. 由…。
得到(from);起源，由……派生(from)E.g.： He derived his love for table tennis from his father.Many English words derived from Frenc h.4.cancel v. 取消;删除E.g.： The decision of the court canc elled the contract.5.owe ： vt. 欠(债等)，应该向(某人)付出;应该把…归功于(to)E.g.： I owe a great deal to my famil y and my friends for their support.His success does not owe to luck but hard work.Phrases：1.speed up (使)加速E.g.： The heart speeds up.We should make double efforts to spee d up socialist construction.2.threaten with 用…威胁，恐吓E.g.： The boss threatens the employees w ith dismissal.老板以开除来威胁员工。
3.at the rate of 以…速度或比率He drives at the rate of 40 kilometer s per hour.The population in this country is inc reasing at the rate of 1%.4.in the face of 在…面前，当着…的面;不顾face： n. 脸;正面 v. 面对E.g.： He was brave in the face of da nger.5.stop…。
from…阻止…做…I can hardly stop myself from shoutin g at him.Having no money cannot stop them from falling in love.6.pay off 偿还;没有白费He plans to pay off the loan (贷款) i n five years.7.solution to 解决…的方法st but not least 最后的但并非最不重要的Last but not least， we must find a p eaceful solution to the problem.Ⅱ.Text ASaving the Rainforests for Future Gen erations：拯救热带雨林，造福子孙万代Para1：Rainforests are being cut and burned from Brazil to Indonesia at such a rate t hat they could well disappear from the ea rth's surface before the year 2050.译：从巴西到印尼，热带雨林正在被砍伐，被烧毁，其速度非常之快，以致于到不了2050年，热带雨林就会被砍光烧光而从地球表面上彻底消失。
They are being cleared for valuable tim ber and other resources to speed up the e conomic growth of the nations in which th ey are located.are being cleared：现在进行时的被动语态译：为了获取贵重木材和其它资源，加速热带雨林地区的国家的经济发展，热带雨林正在逐渐被砍伐得干干净净。
The most recent figures show that the area of rainforest destroyed last year a lone was bigger than the size of Great Br itain and Ireland.译：最近的统计数字表明，仅去年一年被毁掉的热带雨林的面积就比英国和爱尔兰两国的面积加起来还大。
be+ being +V(p.p)clear v. 清除，扫除speed：加快locate： v. (使)坐落于，位于Para.2If the present rate of deforestation is allowed to continue， the consequences for the earth will be great.译：如果听任目前采伐森林的速度继续发展下去，那么给整个地球所带来的后果将是十分严重的。
We shall see a massive upsetting of e cosystems， very large increases in soil erosion， increases in flooding and in dr ought， changes in rainfall patterns and regional， quite possibly global， change s in climate. We shall also probably lose many rare plant and animal species.译：我们将会看到：生态系统失衡;土壤侵蚀现象大规模增加;水灾、旱灾大规模出现;降雨方式改变;地区气候改变，甚至可能导致全球气候的改变。
我们也许会永远失去很多种珍稀的植物和动物。
in：在……方面contribute to ：促成，导致Para.3According to many scientists， the bu rning of rainforests is also directly con tributing to the so-called greenhouse eff ect. This effect， they say， is raising average temperatures and sea levels as th e polar ice caps recede.译：根据许多科学家报告，烧毁热带雨林也直接导致了所谓的温室效应。
科学家们都说，这种温室效应正在使全球平均气温升高，正在使南极和北极地区的冰冠融化，随之而来的也正在使全球海洋的水平面上升。
contribute to(to 介词)：有助于raise vt.rise vi.Para.4The rainforest is essential in other areas also. It is a medicine chest of unl imited potential. The US National Cancer Institute has identified 2，000 rainfores t plants which could be beneficial in fig hting cancer. In today's pharmaceutical m arket， 15 of the 125 drugs derived from plants were discovered in the rainforest.chest：胸膛;箱。
译：从其它方面来看，热带雨林对人类也是必不可缺的。
热带雨林是一个有着无限潜力的医药资源宝库。
美国国家癌症研究院已经证实了有2000种热带雨林中的植物对预防和治疗癌症有奇效。
在今天的药品市场上，125种单味药中，就有15种是从热带雨林发现的植物中提取出来的。
Plant species are not the only forms of life threatened with extinction in therainforest. Rare birds and animals that cannot be found anywhere else in the worl d have been disappearing at the rate of o ne a year since the turn of the century.译：各种植物在热带雨林中并不是受到灭种威胁的唯一生物。