In a world where it seems we already have too much to do，and too many things to think about，it seems the last thing we need is something new that we have to learn.But use cases do solve a problem with requirements:with（ ）declarative equirements it's hard to describle steps and sequences of events.Use cases，stated simply，allow description of sequences of events that，taken together，lead to a system doing something useful.As simple as this sounds，this is important.When confronted only with a pile of requiements，it's often（ ）to make sense of what the authors of the requirements really wanted the system to do.In the preceding example，use cases reduce the ambiguity of the requirements by specifying exactly when and under what conditions certain behavior occurs;as such，the sequence of the behaviors can be regarded as a requirement.Use cases are particularly well suited to capture approaches.Although this may sound simple，the fact is that（ ）equirement capture approaches，with their emphasis on declarative requirements and"shall"statements，completely fail to capture the（ ）of the system's behavior.Use cases are a simple yet powerful way to express the behavior of the system in way that all stakeholders can easily understand.But，like anything，use cases come with their own problems，and as useful as they are，they can be（请作答此空）.the result is something that is as bad，if not worse，that the original problem.Therein it's important to utilize use cases effectively without creating a greater problem than the one you started with.A.misappliedB.appliedC.usedD.powerful
In a world where it seems we already have too much to do，and too many things to think about，it seems the last thing we need is something new that we have to learn.But use cases do solve a problem with requirements:with（ ）declarative equirements it's hard to describle steps and sequences of events.Use cases，stated simply，allow description of sequences of events that，taken together，lead to a system doing something useful.As simple as this sounds，this is important.When confronted only with a pile of requiements，it's often（ ）to make sense of what the authors of the requirements really wanted the system to do.In the preceding example，use cases reduce the ambiguity of the requirements by specifying exactly when and under what conditions certain behavior occurs;as such，the sequence of the behaviors can be regarded as a requirement.Use cases are particularly well suited to capture approaches.Although this may sound simple，the fact is that（ ）equirement capture approaches，with their emphasis on declarative requirements and"shall"statements，completely fail to capture the（ ）of the system's behavior.Use cases are a simple yet powerful way to express the behavior of the system in way that all stakeholders can easily understand.But，like anything，use cases come with their own problems，and as useful as they are，they can be（请作答此空）.the result is something that is as bad，if not worse，that the original problem.Therein it's important to utilize use cases effectively without creating a greater problem than the one you started with.
A.misapplied
B.applied
C.used
D.powerful
B.applied
C.used
D.powerful
参考解析
解析：题意想要表达的意思是任何事情一样，使用的情况下，都有他们自己的问题，他们都有可能被误用，正确答案为A，误用，滥用。附（参考翻译）：在一个似乎已经有做不完的事情的世界里，我们有大量事情要思考，似乎我们不太需要学习新的东西。但是用例解决问题是有条件的：严密的说明性需求使得描述事件的步骤和次序变得举步维艰。简单地讲，用例描述一组事件序列，系统性地执行产生相应有用的结果。听上去简单明了，这是很重要的。当面对一大堆的需求时，通常不太可能理解这些需求的发起者到底想要系统做什么。在前面的案例中，用例通过详细准确描述什么时间、什么情况下确定的行为会发生，以减少需求的不确定。像这样的一些动作序列被看作是一个需求。用例特别适合于捕捉方法。虽然这听起来很简单，但事实上不同的需求会根据他们各自在说明性需求和“应有”的声明的侧重面上捕捉方法，导致完全无法捕捉到系统行为的初衷。用例是一个所有的利益相关者都可以很容易地理解的、简单却十分有效的表达系统的行为的方式。但是，和其他任何事情一样，用例也存在自身的问题，可能会被误用而弄巧成拙。造成的后果也很糟糕，或许只是没有比原本想要解决的问题更麻烦罢了。因此有效使用用例而避免制造更大的麻烦是非常重要的。
相关考题：
—We need to a time to have a talk,now!—What about tomorrow？I am too busy today.A.put up B.fix up C.use up D.look up
BAsk someone what they have done to help the environment recently and they will almost certainly mention recycling. Recycling in the home is very important of course. However, being forced to recycle often means we already have more material than we need. We are dealing with the results of that over-consumption in the greenest way possible, but it would be far better if we did not need to bring so much material home in the first place.The total amount of packaging increased by 12% between 1999 and 2005. It now makes up a third of a typical household’s waste in the UK. In many supermarkets nowadays food items are packaged twice with plastic and cardboard.Too much packaging is doing serious damage to the environment. The UK, for example, is running out of it for carrying this unnecessary waste. If such packaging is burnt, it gives off greenhouse gases which go on to cause the greenhouse effect. Recycling helps, but the process itself uses energy. The solution is not to produce such items in the first place. Food waste is a serious problem, too. Too many supermarkets encourage customers to buy more than they need. However, a few of them are coming round to the idea that this cannot continue , encouraging customers to reuse their plastic bags, for example.But this is not just about supermarkets. It is about all of us. We have learned to associate packaging with quality. We have learned to think that something unpackaged is of poor quality. This is especially true of food. But is also applies to a wide range of consumer products, which often have far more packaging than necessary.There are signs of hope. As more of us recycle, we are beginning to realise just how much unnecessary material are collecting. We need to face the wastefulness of our consumer culture, but we have a mountain to climb.61. What does the underlined phrase “over-consumption” refer to?A. Using too much packaging.B. Recycling too many wastes.C. Making more products than necessary.D. Having more material than is needed.
We laugh at jokes，but seldom about how they work．A．we thinkB．think weC．we do thinkD．do we think
BThe world is not only hungry，it is also thirsty for water． this may seem strange to you，since nearly 75% of the earth is covered with water． But about 97% of this water is sea water．Man can only drink and use the other 3% fresh water that comes from rivers，lakes，under-ground and other places． And we cannot even use all of that，because some of this fresh water has been made dirty．At the moment，this small amount(数量) of fresh water is still enough for us． However，our need for water is getting greater and greater． Only if we take steps to solve this problem now，we can get away from a serious world water shortage later on． The people of the world cannot have an enjoyable life without enough clean water．On one hand we should stop wasting this little water of ours，on the other hand we should find ways to reuse it，but this has not been done widely．Today，in most large cities，water is used only once and it then returns to the sea or runs into underground places．lf we can make it clean again，it can be used once more just as if it were fresh from a spring．But even if large cities reuse its water，we still would not have enough in the future． Where．could we turn to next for water? To the ocean! How can we do to make use of this great a-mount of sea water? We can take the salt from the water to make it fresh．So if we take all these steps，we'll be in no danger of drying up!( )26． Why does the writer say that the world is thirsty for water?A． The amount of fresh water is really very small．B． The people of the world waste too much water．C． The people of the world have to drink a lot of water every day．D． There are too many people in the world needing water．
Passage TwoWhen we see well, we do not think about our eyes very often. It is only when we cannot see perfectly that we realize how important our eyes are.People who are nearsighted can only see things that are very close to their eyes. Everything else is not so clear. Many people who do a lot of close work, such as writing, reading and sewing, become near sighted. Then they have to wear glasses in order to see distant (远处的) things clearly'.People who are nearsighted suffer from just the opposite problem. They can see things that are far away, but they have difficulty in reading a book unless they hold it at arm's length. If they want to do much reading, they must get glasses, too.Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism (散光). This, too, can be corrected by glasses. Some people's eyes become cloudy because of cataracts (白内障). Long ago these people often became blind. Now, however, it is possible to operate on the cataracts and remove them.Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle (角度). To prove this to yourself, look at an object out of one eye; then look at the same object outof the other eye. You will find the object's relation to the background (背景) and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.40. We should take good care of our eyes ______.A. only when we cannot see perfectlyB. only when we can see wellC. even if we can see wellD. only when we realize how important our eyes are
DModcm inventions have speeded up people’s lives amazingly. Motor-cars cover a bundred miles in little more than an hour. Aireraft cross the world a day, while computers operate at lightning speed. Indeed, this love of speed seems never-ending. Every ycar motor-cars are produced which go even faster each new computer boasts（吹嘘）of saving preeious seconds in handling tasks.All this saves timc, but at a prick.When we lose or gain half a day in speeding aeross the world in an airplane, our bodies tell us so. We get the uncomfoerable feeling known as jet-lag; our bodies feel tlru they have been left bebind in anot ar nine zoors Again pending too long at compulers resul’s in painti ninrts and fingers. Mobile phones also to dange according to some seientists; too much uss may thesmit h bul radiation into our brains, a we do not like to think about.Howave, what do we do with the time we have saved?Certainly not or so it seems. We are so accustomed to constant activity that we find it difficult to sit and do nothing, or even just one thing at a time. Pcrhaps the days are long gone when we might listen quietly to a story on the radio, letting imavination take us into another world.There was a time when some people’s lives were devotcd simply to the cultivation of the land or the eare of eattle. No multi-tasking there; their lives wenl on at a much gentler pace, and in a familiar pattern. There is much that we might envy about a way of life like this. Yet before we do so ,we must think of the hard tasks our ancestors faeed;:they farmed with bare hands, often lived close to hunger, and had to fashion tools from wood and stone. Modem machinery has freed peope fre that primitive existcnee.68.The new rooucts opcome more and more time-saving beeause ________A.our lose e u speed uts never-endingB.mo is liwhcdC.shi pnces are increasingly highD.the manufacturers boast a lot
Breathing is something we do ________ and we rarely think about it..A enthusiasticallyB thoughtfullyC eventuallyD spontaneously
They both have _____ work to do, so they are _____ busy. A.much too,too muchB.too much,much tooC.so many, tooD.to, much
We have so many tasks which need to do in all phases of medicine, public health and industry.()
After the earthquake, many people ______ hunger and cold; we must do something to help them. A.bearB.standC.sufferD.have
When I opened the first "Body Shop" in 1976, what I wanted to do was to earn （挣） enough money to feed my children. Today the "Body Shop" is a great company growing fast all around the world. In the years since we began, I have learned a lot. Much of what I have learned will be found in this book, because I believe that we, as a company, have something worth saying about how to run a successful business without giving up what you really believe in.It's not an ordinary business book. It is not just about my life, either. The message is that to succeed in business you have to be different. Business can be fun, and can be run with love and do good. In business, as in life, I need to enjoy myself, to have a feeling of my family and to feel excited by something unusual. I have always wanted the people who work for the "Body Shop" to feel the same way.Now this book sends these ideas out into the world, and makes them public. I'd like to think there are no limits （界限） to our "family", and no limits to what can be done. I find that an exciting thought. I hope you do, too. What kind of person does the writer seem to be?A. She is mainly interested in making money.B. She thinks running a business a different job.C. She seems to be successful but unhappy.D. She seems to be someone with strong confidence.
When I opened the first "Body Shop" in 1976, what I wanted to do was to earn （挣） enough money to feed my children. Today the "Body Shop" is a great company growing fast all around the world. In the years since we began, I have learned a lot. Much of what I have learned will be found in this book, because I believe that we, as a company, have something worth saying about how to run a successful business without giving up what you really believe in.It's not an ordinary business book. It is not just about my life, either. The message is that to succeed in business you have to be different. Business can be fun, and can be run with love and do good. In business, as in life, I need to enjoy myself, to have a feeling of my family and to feel excited by something unusual. I have always wanted the people who work for the "Body Shop" to feel the same way.Now this book sends these ideas out into the world, and makes them public. I'd like to think there are no limits （界限） to our "family", and no limits to what can be done. I find that an exciting thought. I hope you do, too.How does the writer feel about the business she runs?A. It's the biggest company in the world.B. It will possibly be more successful.C. It's one of the most successful businesses.D. It is the only company that is growing all around the world.
As adults,it seems that we are constantly pursuing happiness,often with mixed results.Yet children appear to have it down to an art-and for the most part they don't need self-help books or therapy.instead,they look after their wellbeing instinctively,and usually more effectively than we do as grownups.Perhaps it's time to learn a few lessons from them.41_What does a child do when he's sad?He cries.When he's angry?He shouts.Scared?Probably a bit of both.As we grow up,we learn to control our emotions so they are manageable and don't dictate our behaviours,which is in many ways a good thing.But too often we take this process too far and end up suppressing emotions,especially negative ones.that's about as effective as brushing dirt under a carpet and can even make us ill.What we need to do is find a way to acknowledge and express what we feel appropriately,and then-again，like children-move on.42_A couple of Christmases ago,my youngest stepdaughter,who was nine years old at the time,got a Superman T-shirt for Christmas.It cost less than a fiver but she was overjoyed,and couldn't stop talking about it.Too often we believe that a new job,bigger house or better car will be the magic silver bullet that will allow us to finally be content,but the reality is these things have very little lasting impact on our happiness levels.Instead,being grateful for small things every day is a much better way to improve wellbeing.43_Have you ever noticed how much children laugh?If we adults could indulge in a bit of silliness and giggling,we would reduce the stress hormones in our bodies,increase good hormones like endorphins,improve blood flow to our hearts and even have a greater chance of fighting off enfection.All of which,of course,have a positive effect on happiness levels.44_The problem with being a grown up is that there's an awful lot of serious stuff to deal with---work,mortgage payments,figuring out what to cook for dinner.But as adults we also have the luxury of being able to control our own diaries and it's important that we schedule in time to enjoy the things we love.Those things might be social,sporting,creative or completely random（dancing aroud the living room,anyone?）--it doesn't matter,so long as they're enjoyable,and not likely to have negative side effects,such as drinking too much alcohol or going on a wild spending spree if you're on a tight budget.45_Having said all of the above,it's important to add that we shouldn't try too hard to be happy.Scientists tell us this can backfire and actually have a negative impact on our wellbeing.As the Chinese philosopher Chuang Tzu is reported to have said:"Happiness is the absence of striving for happiness."And in that,once more,we need to look to the example of our children,to whom happiness is not a goal but a natural by product of the way they live.44选？A.Be sillyB.Have funC.Express your emotionsD.Don't overthink itE.Be easily pleasedF.Notice thingsG.Ask for help
资料：When we see well，we do not think about our eyes very often. It is only when we cannot see perfectly that we realize how important our eyes are.People who are near-sighted can only see things that are very close to their eyes，Everything else seems blurry（=unclear）.Many people who do a lot of work，such as writing，reading and sewing become near-sighted.People who are far-sighted suffer from just the opposite problem. They can see things that are far away，but they have difficulty in reading a book unless they hold it at arm’s length. If they want to do much reading，they must get glasses，too.Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism. This，too，can be corrected by glasses. Some people’s eyes become cloudy because of cataracts. Long ago these people often became blind. Now，however，it is possible to operate on the cataracts and remove them.Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle. To prove this to yourself，look at an object out of one eye；Then look at the same object out of your other eye. You will find the object’s relation to the background and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.People who suffer from astigmatism have______.A.a difficulty that can be corrected by an operationB.eyes that are not exactly the right shapeC.an eye difficulty that cannot be corrected by glassesD.one eye bigger than the other
资料：When we see well，we do not think about our eyes very often. It is only when we cannot see perfectly that we realize how important our eyes are.People who are near-sighted can only see things that are very close to their eyes，Everything else seems blurry（=unclear）.Many people who do a lot of work，such as writing，reading and sewing become near-sighted.People who are far-sighted suffer from just the opposite problem. They can see things that are far away，but they have difficulty in reading a book unless they hold it at arm’s length. If they want to do much reading，they must get glasses，too.Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism. This，too，can be corrected by glasses. Some people’s eyes become cloudy because of cataracts. Long ago these people often became blind. Now，however，it is possible to operate on the cataracts and remove them.Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle. To prove this to yourself，look at an object out of one eye；Then look at the same object out of your other eye. You will find the object’s relation to the background and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.Having two eyes instead of one is particularly useful for______.A.looking over a wide areaB.seeing objects far awayC.judging distancesD.seeing at night
资料：When we see well，we do not think about our eyes very often. It is only when we cannot see perfectly that we realize how important our eyes are.People who are near-sighted can only see things that are very close to their eyes，Everything else seems blurry（=unclear）.Many people who do a lot of work，such as writing，reading and sewing become near-sighted.People who are far-sighted suffer from just the opposite problem. They can see things that are far away，but they have difficulty in reading a book unless they hold it at arm’s length. If they want to do much reading，they must get glasses，too.Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism. This，too，can be corrected by glasses. Some people’s eyes become cloudy because of cataracts. Long ago these people often became blind. Now，however，it is possible to operate on the cataracts and remove them.Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle. To prove this to yourself，look at an object out of one eye；Then look at the same object out of your other eye. You will find the object’s relation to the background and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.When things far away seem indistinct， one is probably______.A.astigmaticB.far-sightedC.suffering from cataractsD.near-sighted
资料：When we see well，we do not think about our eyes very often. It is only when we cannot see perfectly that we realize how important our eyes are.People who are near-sighted can only see things that are very close to their eyes，Everything else seems blurry（=unclear）.Many people who do a lot of work，such as writing，reading and sewing become near-sighted.People who are far-sighted suffer from just the opposite problem. They can see things that are far away，but they have difficulty in reading a book unless they hold it at arm’s length. If they want to do much reading，they must get glasses，too.Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism. This，too，can be corrected by glasses. Some people’s eyes become cloudy because of cataracts. Long ago these people often became blind. Now，however，it is possible to operate on the cataracts and remove them.Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle. To prove this to yourself，look at an object out of one eye；Then look at the same object out of your other eye. You will find the object’s relation to the background and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.We should take good care of our eyes______.A.even if we can see wellB.only when we cannot see perfectlyC.only when we realize how important our eyes areD.only when we can see well
In a world where it seems we already have too much to do,and too many things to think about,it seems the last thing we need is something new that we have to learn.But use cases do solve a problem with requirements:with__1__declarative requirements it's hard to describe steps and sequences of events.Use cases,stated simply,allow description of sequences of events that,taken together,lead to a system doing something useful.As simple as this sounds,this is important.When confronted only with a pile of requirements,it's often__2__to make sense of what the authors of the requirements really wanted the system to do.In the preceding example,use cases reduce the ambiguity of the requirements by specifying exactly when and under what conditions certain behavior occurs;as such,the sequence of the behaviors can be regarded as a requirement.Use cases are particularly well suited to capturing these kind of requirements.Although this may sound simple,the fact is that__3__requirement capture approaches,with their emphasis on declarative requirements and"shall"statements,completely fail to capture the__4__of the system's behavior.Use cases are a simple yet powerful way to express the behavior of the system in way that all stakeholders can easily understand.But,like anything,use cases come with their own problems,and as useful as they are,they can be__5__.The result is something that is as bad,if not worse,than the original problem.Therein it's important to utilize use cases effectively without creating a greater problem than the one you started with.4、_____A.staticsB.natureC.dynamicsD.originals
In a world whereit seems we already have too much to do, and too many things to think about, itseems the last thing we need is something new that we have to learn.But use cases dosolve a problem with requirements:with （71） declarative requirements it's hard to describe steps and sequences ofevents.Use cases, statedsimply, allow description of sequences of events that, taken together, lead toa system doing something useful.As simple as this sounds,this is important.When confronted only with a pile of requiements, it's often（72）to make sense of what the authors of therequirements really wanted the system to do.In the preceding example, use casesreduce the ambiguity of the requirements by specifying exactly when and underwhat conditions certain behavior occurs;as such, the sequence of the behaviors canbe regarded as a requirement. Use cases are particularly well suited to captureapproaches. Although this may sound simple, the fact is that （73） requirement capture approaches, with theiremphasis on declarative requirements and "shall"statements,completely fail to capture fail to capture the （74） of the system's behavior. Use cases are asimple yet powerful way to express the behavior of the system in way that allstakeholders can easily understand.But,likeanything, use cases come with their own problems, and as useful as theyare,they can be （75）. The result is something that is as bad, if not worse, that the originalproblem.Therein it's important to utilize use cases effectively withoutcreating a greater problem than the one you started with.A.misappliedB.appliedC.usedD.powerful
The water we drink and use is running short in the world.We all have to learn how to stop wasting our limited water.One of the steps we should take is to find ways of reusing it.Experiments have already been done in this field.Today in most large cities,fresh water is used only once,then it runs into waste system.But it is possible to pipe the used water to a purifying factory.There it can be filtered and treated with chemicals so that it can be used again,just as it were fresh from a spring.But even if every large city purified and reused its water,we still would not have enough.Then we could turn to the oceans.All we’d have to do to make use of the seawater on earth is to get rid of the salt.This process is called desalinization,and it is already in use in many parts of the world.The way to stop wasting our limited water is to________.A.do experiments with waterB.purify the used water and reuse itC.use fresh water once againD.make use of seawater
Research Is a State of Mind For many years there has been much misunderstanding as to just what research is. The popular conception seems to be that there is something mysterious about it， and before any research can be done it is necessary to have expensive scientific apparatus and large， elaborately equipped laboratories. Actually， this is not so. （6） It is a simple， organized way of trying to accomplish something you wish to do—so simple that anyone can do research anywhere at any time. First， you select the problem you would like to solve， then you list at least ten reasons why it has not been solved. （7） It takes just as much effort to solve a useless problem as a useful one. （8） After carefully—and I want to emphasize that word “carefully”—selecting the problem and the ten things between you and the solution， you then use the same procedure as in solving a crossword puzzle.（9）In the solution of the remaining obstacles you may need some simple apparatus， but the things you will probably need most are infinite patience and persistence. Few people realize the difficulties of doing any new thing. Maybe one of the reasons people are so easily discouraged is because of their education. During all our years at school we were examined two or three times a year. If we failed once， we were out. （10）If we are going to make progress， we must learn to fail intelligently so that we won't become discouraged at the 99.9 per cent failure.8.（）A、Makesurethegameisworththecandle.B、Thatisastepintherightdirection，butIdon'tbelieveitisenough.C、Youtaketheeasyobstaclesfirstandbyaprocessofeliminationyoueventuallyarriveattheoneortwomajorones.D、Butinselectingtheproblem，youneedtobesuretoanalyzeitcarefullytoseethatitisworththeeffort.E、Researchisn'taphysicalthingatall；it'sastateofmind.F、Bycontrast，allresearchworkis99.9percentfailureand，ifwesucceedonce，wearein.
单选题Research Is a State of Mind For many years there has been much misunderstanding as to just what research is. The popular conception seems to be that there is something mysterious about it， and before any research can be done it is necessary to have expensive scientific apparatus and large， elaborately equipped laboratories. Actually， this is not so. （6） It is a simple， organized way of trying to accomplish something you wish to do—so simple that anyone can do research anywhere at any time. First， you select the problem you would like to solve， then you list at least ten reasons why it has not been solved. （7） It takes just as much effort to solve a useless problem as a useful one. （8） After carefully—and I want to emphasize that word “carefully”—selecting the problem and the ten things between you and the solution， you then use the same procedure as in solving a crossword puzzle.（9）In the solution of the remaining obstacles you may need some simple apparatus， but the things you will probably need most are infinite patience and persistence. Few people realize the difficulties of doing any new thing. Maybe one of the reasons people are so easily discouraged is because of their education. During all our years at school we were examined two or three times a year. If we failed once， we were out. （10）If we are going to make progress， we must learn to fail intelligently so that we won't become discouraged at the 99.9 per cent failure.6.（）AMake sure the game is worth the candle.BThat is a step in the right direction， but I don't believe it is enough.CYou take the easy obstacles first and by a process of elimination you eventually arrive at the one or two major ones.DBut in selecting the problem， you need to be sure to analyze it carefully to see that it is worth the effort.EResearch isn't a physical thing at all； it's a state of mind.FBy contrast， all research work is 99. 9 per cent failure and， if we succeed once， we are in.
单选题The villagers have offered much help to us and we think we should do something for them _____.Ain returnBin placeCin fashionDin danger
单选题What do we learn from the last paragraph?AIf we focus our attention on the thing, we might forget another.BMemory depends to a certain extent on the environment.CRepetition helps improve our memory.DIt we keep forgetting things, we’d better return to where we were.
问答题Practice 12 (1) Whatever its underlying reason, there is no doubt that much of the pollution caused could be controlled if only companies, individuals and governments would make more efforts. In the home there is an obvious need to control litter and waste. Food comes wrapped up three or four times in packages that all have to be disposed of; drinks are increasingly sold in bottles or tins which cannot be reused. (2) This not only causes a litter problem, but also is a great process by persuading many of us not only to buy things we neither want nor need, but also to throw away much of what we do buy. Pollution and waste combine to a problem everyone can help to solve by cutting out necessary buying, excess consumption and careless disposal of the products we use in our daily lives.
单选题Research Is a State of Mind For many years there has been much misunderstanding as to just what research is. The popular conception seems to be that there is something mysterious about it， and before any research can be done it is necessary to have expensive scientific apparatus and large， elaborately equipped laboratories. Actually， this is not so. （6） It is a simple， organized way of trying to accomplish something you wish to do—so simple that anyone can do research anywhere at any time. First， you select the problem you would like to solve， then you list at least ten reasons why it has not been solved. （7） It takes just as much effort to solve a useless problem as a useful one. （8） After carefully—and I want to emphasize that word “carefully”—selecting the problem and the ten things between you and the solution， you then use the same procedure as in solving a crossword puzzle.（9）In the solution of the remaining obstacles you may need some simple apparatus， but the things you will probably need most are infinite patience and persistence. Few people realize the difficulties of doing any new thing. Maybe one of the reasons people are so easily discouraged is because of their education. During all our years at school we were examined two or three times a year. If we failed once， we were out. （10）If we are going to make progress， we must learn to fail intelligently so that we won't become discouraged at the 99.9 per cent failure.8.（）AMakesurethegameisworththecandle.BThatisastepintherightdirection，butIdon'tbelieveitisenough.CYoutaketheeasyobstaclesfirstandbyaprocessofeliminationyoueventuallyarriveattheoneortwomajorones.DButinselectingtheproblem，youneedtobesuretoanalyzeitcarefullytoseethatitisworththeeffort.EResearchisn'taphysicalthingatall；it'sastateofmind.FBycontrast，allresearchworkis99.9percentfailureand，ifwesucceedonce，wearein.
单选题Surveys show that ______ less sleep than we think, ______ too much sleep could even harm our health.Anot only do we need, but thatBnot only we need, but alsoCnot only we need, but thatDnot only do we need, but also