THE KEYS to Unit 2大学英语第四册

Unit 2
A. The key to the exercises
V ocabulary
1.
1)expansion 2) automated 3)vapor 4) take control of 5)hazards
6)satellite 7) vibrated 8) magnetic 9) bunched
10)in the air 11) got/was stuck in 12) approximately
2.
1)send out 2)stand up for 3)pass for 4)were closing in on
5)starting up 6)went through 7)fill out 8)fall into
3.
1) incorporates all the latest safety features.
2) two trees ten feet apart.
3) awarding lucrative contracts to his construction firm.
4) the prototype of a new model before they set up a facotry to make the cars.
5) are correlated in all racial groups
4.
1) the application; remote; has turned into a reality; are poised to
2) that vibrate; can detect; frequency
3) lanes; are mounted in; alert a; hazard
II. Word Formation
Clipped words: kilogram; memorandum; gymnasium; liberation; doctor; veterinarian;
preparatory; automobile; influenza
Blends: medical care; electronic mail; communications satellite; news broadcast; sky hijack; European dollar; breakfast and lunch; television broadcast;
Oxford and Cambridge
III. Usage
1.swimming pool;
2. drawing board;
3. enriched Middle English
4. disturbing change;
5. fully developed prototype;
6. Canned foods;
7. working population; 8. puzzling differences
Compreehnsive Exercisese
I.Cloze
1. Text-related
1) computerized; 2) start up; 3) be poised to; 4) alert
5) hazards; 6) monotonous; 7) take control of; 8) steer
9) lane 10) decrease 11) calculate 12) eliminate
13) getting stuck in 14) mounted 15) detect 16) vapor
2. Theme-related
1)generates; 2)related; 3)revolutionized; 4)enabled 5)opportunities;
6)overall; 7)manufacturing; 8)dependent; 9)interact; 10)fatalities II. Translation
1.
1) There was an unusual quietness in the air, except for the sound of artillery in the
distance.
2) The expansion of urban areas in some African countries has been causing a significant fall in living standards and an increase in social problem.
3) The research shows that atmospheric carbon dioxide levels are closely correlated with global temperatures.
4) The frequency of the bus service has been improved from 15 to 12 minute recently.
5) The diver stood on the edge of the diving board, poised to jump at the signal from the coach.
2.
Automobiles have, since their invention, revolutionized transportation, changing forever the way people live, travel, and do business. On the other hand, they have brought hazards, especially highway fatalities. However, today the application of computer technology and electronic sensors in designing and manufacturing cars makes it possible to eliminate most of traffic accidents. For example, electronic sensors mounted in your car can detect alcohol vapor in the air and refuse to start up the engine. They can also monitor raod conditions by receiving radio signals sent out from orbiting satellites and greatly reduce your chances of getting stuck in traffic jams.
B. Supplementary exercises:
1.Translation
Directions: put the following passage into English, using the words and phrases given below.
1) approximately 2) correlate 3) decrease 4) eliminate
5) get stuck 6) highway 7) manufacture 8)pollution
交通问题一直是城市发展过程中一个令人头疼的问题。

拿上海来说，目前仅出租车的数量就达到了大约300,000辆，还不用说越来越多的私家车。

汽车生产规模的扩大和消费需求的增长往往和环境污染问题相联系。

同时，尽管上海的公路交通和轨道交通系统已经初具规模，但交通事故一直没有明显下降。

即使在高架道路上，车辆也时常会寸步难行。

要彻底消除各种交通问题看来很难实现，但通过合理规划和一系列相关政策法规的出台，这个问题将有望得以缓解。

The traffic problem has always been a grave concern during the urban development. Take Shanghai for example, there are approximately 300,000 taxis, not to say of an ever increasing number of private cars. The expansion of the automobile manufacturing and the growth of consumer demand often correlate with environmental pollution. Meanwhile, although the highway and railway transprotaion system has aleady taken shape in Shanghai, the car accidents have never decreased signigicantly. Cars frequently get stuck even on vaulted highways. The promise of eliminating all sorts of traffic problems seems difficult to fulfill. Yet with reasonalbe planning and with the establishment of related policy and regulations, the problem is likely to be alleviated.
eful Expressions
1. 计算机革命the computer revolution
2. 制造业manufacturing industry
3. 长途司机long-distance driver
4. 被严重低估be grossly underestimated
5. 威胁生命的重大隐患life-threatening hazard
6. 解决问题cure the problem
7. 积极的影响 a positive impact
8. 与无线电信号调谐be tuned to radio signals
9. 在任何一个特定时间at any given time
10. 量子理论法则the laws of the quantum theory
11. 精确的频率precise frequency
12. 发出无线电信号send out a radio signal
13. 换算出be converted into
14. 导航能力navigational capability
15. 几乎无限virtually limitless
16. 手杖walking sticks
17. 遥控remote control
18. 潜在的应用potential use / application
19. 要求call for
20. 完全控制take complete control of
21. 被编成组be bunched into groups
22. 一齐行驶travel in unison
23. 对环保有利environmental boon
3. Learn paragraphs 7-8 by heart.。