第一单元《动物的教育问题》99年已考过，因此以词汇为主，重点在练习Vocabulary题。

第二单元《廉价货》以词汇为主，重点在练习Vocabulary题。

第三单元《血液检查》以词汇、课文段落以及课后回答问题为主，重点在练习Vocabulary和Question题。

　一、本单元划分为四个部分：
　　I: What are blood tests for? (Paras 1)
　　II: Blood is a vital part of your body?( Paras 2-4)
　　III: Functions of blood tests.（Paras 5-12）
　　IV: Blood tests are necessary to keep yourself health.（Paras 13）

　二、回答问题Question：

　　1．Why does the author say that your blood is a vital part of your body?
　　Answer: Because:
　　 1) Blood picks up oxygen in your lungs and carries it to your cells, which use the oxygen to produce energy.
　　 2)Blood carries wastes away from your cells.
　　 3) Blood carries white blood cells and disease-fighting chemicals called antibodies to places where foreign invaders such as bacteria and viruses are causing infections.
　　 4)Blood carries food from your stomach and small intestine to all parts of your body.

　　2. What is the use of white cells and antibodies?
　　　The use of white cells and antibodies is to gobble up the invaders and knock them out.

　　3. What is the first step to find out the blood type?
　　　The first step to find out your blood type is that the doctor sends your blood to　　　　　　laboratory. There your red cells are separated from the other parts of your blood.

　　4. How can the technician figure out your blood type?
　　　The technician mixes your red blood cells with two kinds of blood serum. One contains anti-A antibodies, the other contains anti-B antibodies. By finding which mixture can make the red cells clump together, he can figure out the blood type.

　　5. What is CBC used for?
　　 CBC is used to find out whether the number of your white cells is higher than it ought to be.

第四单元《嘿，我是顾客》以词汇为主，重点在练习Vocabulary题。

第五单元《其它行星上有生命吗？当然有！》以词汇、课文段落以及课后回答问题为主，重点在练习Vocabulary和Question题。

　一、本单元划分为三个部分：
　　1．The importance of space stations.
　　2. Explorations.
　　3. Whether there are other inhabited planets.

　二、回答问题Question：
　　1. Why is it important to have scientific stations in space?
　　　Orbital stations are used to provide ideal conditions for observing stars objects in space.

　　2. Why does the author say that no new galaxy are thought to exist?
　　　Because nearly all the galaxies were born at the same time, when the universe was constituted 15 billion (light) years ago.

　　3. According to the author what kind of condition is needed to observe the birth of stars?
　　　To observe the birth of a galaxy that happened so long ago, 1)you have to see a very long way. 2)you need to have orbital stations to provide ideal conditions to observe.

　　4. Explain the exploration we have so far.
　　　1)In 1989 the satellite Voyager II will reach Neptune after a journey of three and a half years.
　　　2)Five probes were sent to rendezvous with Halley's comet.
　　　3)Exploration of the solar system is more or less under way.

　　5. Do you think there are inhabited planets? Why or why not?
　　　Yes, I think there are, because no matter how far back into the universe we look, we find the same elements: atoms, molecules, stars, galaxies. We can show that the laws of physics have remained unchanged through 15 billion light years.

第六单元《草地上的黄昏劫案》以词汇为主，重点在练习Vocabulary题。

第七单元《适者生存》以词汇、课文段落以及课后回答问题为主，重点在练习Vocabulary和Question题。

　回答问题Question：
　　1．What kind of change is evolutionary change?
　　　If the new creature is able to reproduce itself so that its young also have the new color. 　This change in color is evolutionary change.

　　2. Why did the Peppered Moth begin to change color in the industrial areas?
　　　In industrial areas, pollution covered barks with soot and grime. The darker Peppered Moths 　were less visible and more likely to survive. So Peppered Moths began to change color.

　　3. What method is employed in the development of Paragraph 5?
　　　Definition giving method.

　　4. What is natural selection?
　　　A mutation happens to suit a new environment, and the 'odd' creature survives because it is better fitted. Then it reproduces and a new type of creature evolves. Meanwhile the others have become unsuited to the changed environment. They must either change their behaviour or become extinct.

　　5. Smoke control progammes have been introduced in industrial regions in Britain since 1952. What prediction" title="n.预告；(气象等)预报">prediction can you make about the Peppered Moth?
　　　The Peppered Moths will become lighter in color.

第八单元《计算机是什么》以词汇、课文段落以及课后回答问题为主，重点在练习Vocabulary和Question题。

　一、本单元划分为四个部分：
　　1．The ways of conveying and processing information before the invention of computers.
　　2. The functions of computers.
　　3. Two groups of computers.
　　4. A comparison of computers and human minds.

　二、回答问题Question：
　　1. How did primitive men convey information?
　　　They carved word-pictures on the walls of ancient caves and hieroglyphics on stone tablets.

　　2. How did men try to extend the range of his senses and the power of his mind?
　　　They have invented many instruments to help them see better and understand more, such as telescope, microscope, radio, telephone and telegraph.

　　3. Explain the difference between digital computers and analog computers?
　　　Digital computers work by using specific information which is usually in the form of numbers. Analog computers, on the other hand, usually process continuous information.

　　4. Why was Lord Kelvin's machine regarded as one of the first analog computers?
　　　Because his machine gave continual indications of how tides were to rise and fall, that is, it process continuous information.

　　5. Compare and contrast computers with the minds of men.
　　Computers' advantages:
　　 1) they can work through a series of problems and make thousands of logical decisions without becoming tired.
　　 2) they can reach solutions to problems in a fraction of time it takes men to do the job.
　　 3) they can replace men in dull, routine tasks.
　　Computers' disadvantages:
　　 1)they are not creative.
　　 2)they can not exercise value judgements.
　　 3)they have no originality. 4) their achievements are not very great when compared to what the minds of men can do.
第九单元《信鸽是如何找到家的？》以词汇、课文段落以及课后回答问题为主，重点在练习Vocabulary和Question题。

　一、本单元划分为三个部分：
　　1．The question.(1---4)
　　2. The first experiment.(5-7). The second experiment(8-10).
　　3. Conclusion. There are other questions still to be answered.(12-13)

　二、回答问题Question：
　　1. Why do you say the mystery is very old?
　　　Because pigeons have been used as messengers for hundreds of years but their ability to find home is still unknown.

　　2. Why can not we mix up the pigeons' sense of direction by turning round and round?
　　　Because they use the sun or the earth's magnetic field to tell direction.

　　3. How can we mix up the pigeons' direction?
　　　On sunny days we can shift their biological clocks. On cloudy days we can attached a strong little bar magnetic on their backs.

　　4. How did the scientists prove that pigeons have a built-in clock?
　　　In a number of experiments, they attached strong little bar magnetic to one group of pigeons and little brass bars to the other group. Both were taken away from home and let go. On sunny days, none of the magnet-pigeons were fooled. However, on cloudy days, the brass pigeons chose the right direction while the magnet-pigeons acted completely lost.

　　5. Have the scientists answered the old mystery? Explain it.
　　　No, they haven't fully answered the question. Though they have discovered how pigeons tell direction, (that is, they use the sun or use the earth's magnet) they haven't found out how pigeons know where home is.

第十单元《太空行走》以词汇、课文段落以及课后回答问题为主，重点在练习Vocabulary和Question题。

　一、本单元划分为三个部分：
　　1．What space looks like.(1---3)
　　2. Preparations for the first space walking.(4---6)
　　3. The first space walking. 1)Before walking out of the spaceship(7-8). 2)After walking out of the spaceship.(9---11)

　二、回答问题Question：
　　1. What does the outer space look like?
　　　The whole world seemed to be black, black nothingness. The sky was black with bright, shinning stars that never twinkled. The sun, a white, burning disc, seemed to hang in the black velvet of the surrounding heavens.

　　2. What would happen if the earth had no gravity?
　　　If the earth had no gravity, our feet no longer stay on the ground, we float around in the air, and the slightest touch may send us drifting off in the opposite direction.

　　3. What did the astronauts know after the launching of Sputnik?
　　　It was indeed possible to send objects far enough out of range of earth's gravity so that they would not fall back to earth. Rather, such objects could be forced to revolve about the earth, just as the moon does.

　　4. Why would it be much better to launch spaceships from the moon?
　　　If spaceships were launched from space or from the moon. The absence of weight would permit the ships to be launched with great speed at reduced pressures. A relatively small explosion would be enough to send a ship off at a very fast rate.

　　5. How did Leonov feel and what did he find during his walk in space?
　　　Leonov found the earth appeared as a huge, round disc, filling a large part of the sky and the relif of hills and mountains was more easily observed from that distance than from a plane flying at a few thousand feet. He was enjoying the cosmos so much that he felt disappointed to have to stop his wanderings so soon.

第十一单元《我们需要额外的维生素吗？》以词汇、课文段落以及课后回答问题为主，重点在练习Vocabulary和Question题。

　回答问题Question：
　　1. Why do many people ask the question "how many of us are healthy, and what is a normal diet"?
　　　Because there is an element of doubt in their minds about the question.

　　2. Find a sentence or an example from Paragraph 1 to show that most tinned, processed and 　dried foods are not true "junk" foods.
　　　Most tinned, processed and dried foods contain useful amounts of fat, protein, carbohydrate, vitamins and minerals.

　　3. Who needs extra vitamins?
　　　The people who do live on "junk" foods might need extra vitamins.

　　4. Is the effect of vitamin E known to us all? Why?
　　　No, because this is an unexplored area in vitamin research and the only known advantages of 　vitamin E are confined to specialized medical cases.

　　5. Why do placebo pills sometimes work for some patients?
　　　Because many of us react favourably to any kind of interest taken in out problems and derive as much benefit from that as we would from a medical drug.

第十二单元《消费者》以词汇、课文段落以及课后回答问题为主，重点在练习Vocabulary和Question题。

　一、本单元划分为四个部分：
　　1．Consumers are important to American economy.(1---6)
　　2. The law of supply and demand.(7---14)
　　3. American consumers borrow money to spend. (15-21).
　　4. The differences between American economic system and socialist countries' economic system.(22---29)

　二、回答问题Question：
　　1. Is there a contradiction between people's needs and their incomes? If there is, explain the　　contradiction.
　　　Yes, there is. Their needs are almost endless, but their incomes aren't.

　　2. If the price falls below what a goods cost, what will the seller do?
　　　The seller will be discouraged production, perhaps be driven the high-cost producers out of business or force them to make something else.

　　3. Give one example to show that price is the guide-post in a free-market economy.
　　　Farmers periodically plant less wheat or raise fewer cattle if the prices for those commodities give too little return for the cost involved.

　　4. How can you make a wise use of debt?
　　　If I can meet the schedule of payments for loans or credit cards, I will use debt to buy the things I want most now, rather than wait to accumulate the full purchase price.

　　5. Why can doctors in American earn a lot of money?
　　　Because society places a monetary value on various professions and skills based on the law of supply and demand. Doctors must study long years to develop special skills and therefore, they are in short supply.

第十三单元《妇女与烟草》以词汇、课文段落以及课后回答问题为主，重点在练习Vocabulary和Question题。

　一、本单元划分为二个部分：
　　1．Women's health is seriously affected by smoking. general(1---3),specific(4-6)
　　2. Things can be done to halt and reverse smoking among women.(7---15)

　二、回答问题Question：
　　1. What is the author's prediction" title="n.预告；(气象等)预报">prediction of tobacco industry in the year 2025?
　　　The global death toll from tobacco by the year 2025 may increase to eight million deaths per year.

　　2. Why has the scale of smoking received surprisingly little attention?
　　　Because smoking is still seen by many as mainly male problem, perhaps because men were the first to take up the habit and therefore the first to suffer the ill-effects.

　　3. What are the main problems smoking has caused?
　　　Smoking causes 1) the same disease in women as in men and the gap between their death rates is narrowing. 2)There are dramatically increasing trends in respiratory cancer among women in developed countries, and the casualrelationship of smoking to lung cancer is clear. 3)Women's health is also affected by the smoking of others, that is, by passive or involuntary smoking.

　　4. What action should be taken to halt or reverse the tobacco epidemicamongst women?
　　　We should reduce the already high level of smoking among women in the industrialized world and ensure that the low level of smoking in developing countries does not increase.

　　5. What do you think of the smoking problem in our country?
　　　It is very serious in our country. Many young people, including girls, take up smoking and a large number of people suffer or die of tobacco-related diseases.

第十四单元《工业中的水》以词汇、课文段落以及课后回答问题为主，重点在练习Vocabulary和Question题。

　回答问题Question：
　　1. What essential functions does water fulfil in modern industry?
　　　1) Water is used as a raw material;
　　　2)It is essential for cooling machinery;
　　　3) It provides steam;
　　　4)It is one of the most important sources of power.

　　2. Is water inexhaustible as a source of power? Why or Why not?
　　　Yes, because its power is ultimately derived from the force of gravity and from the sun and there is a water cycle.

　　3. In modern industry, how is water used as a source of power?
　　　1) Water is used to produce electricity;
　　　2)Water is a vital raw material in the textile industries;
　　　3)Water is a valuable raw material because of the dissolved minerals it contains.

　　4. How can a river generateelectricity? What conditions does a river have to have?
　　　A river generateelectricity by constructing or enlarging waterfalls. The conditions for rivers to produce electricity is that 1)the river must have an adequate flow of water; 2)the amount of water in the river should not vary too much from season to season; 3) the river must be fairly near the industrial centers.

　　5. Can water be used in any industry? In there any special case? What is it?
　　　No, the textile industries are a special case. Soft water is required in these industries.

第十五单元《市场抽样调查》以词汇为主，重点在练习Vocabulary题。

第十六单元《从微机繁荣中获取最大利益》以词汇、课文段落以及课后回答问题为主，重点在练习Vocabulary和Question题。

　一、本单元划分为四个部分：
　　1．The cost of computers has been falling.(1)
　　2. Microcomputers can wreak havoc.(2---3)
　　3. Hardware, software and computer languages.(4---6)
　　4. Two basic forms of software: custom software and package.(7---8)

　二、回答问题Question：
　　1. What is the name for the department in a company that houses the computer and the staff who work with it?
　　　It is Computering Deparment.

　　2. The greatest danger facing companies is that the whole system will lose the sales lodger debters and all if the date is corrupted.
　　3. BASIC and COBOL.

　　4. The three stages are design, programming, testing.

　　5. The differences between custom written software and package software are that 1)custom software can said to resemble a bespoke suit, while package is 'off the peg??. 2)With a bespoke system, the whole development cost must be borne by one user; with a package, that cost is spread over many users, so that popular packages which sell in large numbers are relatively cheap.

第十七单元《为孩子做的最重要的事》以词汇、课文段落以及课后回答问题为主，重点在练习Vocabulary和Question题。

　一、本单元划分为三个部分：
　　1． Trelease's secret in education.(1-6)
　　2. Trelease's own experience.(7---11)
　　3. Trelease advocates that parents should read to their children.

　二、回答问题Question：
　　1. Because they don't quite believe Trelease and they think they have no time to read to their children.

　　2. Reading to children builds vocabulary, stimulates imagination, stretches the attention span, nourishes emotional development, and introduces the textures and nuances of English language.

　　3. Because these parents were rarely read to as children.

　　4. Reading aloud to their children.

　　5. The author wants to tell readers that reading aloud to children plays a very important role in children's growth and that parents should do this as soon as possible.
第十八单元《颜色与欧洲人》以词汇、课文段落以及课后回答问题为主，重点在练习Vocabulary和Question题。

　一、本单元划分为二个部分：
　　1． European countries have different preferences for colors.(1-7)
　　2. Color preferences keep changing in fashion industry.(8---20)
　　　A. Color is changing color before our eyes.(8-11)
　　　B. Experts predict color.(12---14)
　　　C. British people have a changed sense of color.(15---17)
　　　D. The tendency of color development.(18---20)