Ifthespeakersinaninstallationareoutofphase,thismeansthat() A.thesubwooferisatthewrongangle.B.thefrontandrearspeakersarereversed.C.thepolarityofthespeakersarereversed.D.theangleofthespeakersareincorrect.
Ifthespeakersinaninstallationareoutofphase,thismeansthat()
A.thesubwooferisatthewrongangle.
B.thefrontandrearspeakersarereversed.
C.thepolarityofthespeakersarereversed.
D.theangleofthespeakersareincorrect.
相关考题：
In a narrow channel or fairway when overtaking can take place only if the vessel to be over-taken has to take action to permit safe passing， the vessel intending to overtake shall indicate her intention by sounding appropriate signal． This means that ________ ．A.the vessel to be overtaken shall sound appropriate signal firstB.the overtaking vessel shall sound appropriate signal firstC.the overtaking vessel shall take action to permit safe passingD.the vessel to be overtaken shall take action to permit safe passing before hearing appropriate signal
Owners are to be responsible for loss of or damage to the goods or delay in delivery of the goods only in case the loss，damage or delay has been caused by the improper or negligent stowage of the goods．This means that ______.A.Owners are to be responsible for loss or damage even such loss or damage is not caused by the improper stowageB.Owners are only responsible for the loss or damage or delay caused by improper or negligent stowage．C.Both A and B are rightD.Both A and B are wrong
共用题干第一篇Human EvolutionBeing a man has always been dangerous.There are about 105 males born for every 100 females, but this ratio drops to near balance at the age of maturity,and among 70-year-old there are twice as many women as men. But the great universal of male mortality is being changed.Now,boy babies survive almost as well as girls do. This means that,for the first time,there will be an excess of boys in those crucial years when they are searching for a mate. More important,another chance for natural selection has been removed. Fifty years ago,the chance of a baby(particularly a boy baby)surviving depended on its weight. A kilogram too light or too heavy meant almost certain death.Today it makes almost no difference.Since much of the variation is due to genes,one more agent of evolution has gone.There is another way to commit evolutionary suicide:stay alive,but have fewer children.Few people are as fertile as in the past. Except in some religious communities,very few women have 15 children.Nowadays the number of births,like the age of death,has become average.Most of us have roughly the same number of offspring. Again,differences between people and the opportunity for natural selection to take advantage of it have diminished.India shows what is happening. The country offers wealth for a few in the great cities and poverty for the remaining tribal peoples.The grand mediocrity of today一everyone being the same in survival and number of offspring means that natural selection has lost 80%of its power in upper-middle一class India compared to the tribes.For us,this means that evolution is over;the biological Utopia has arrived.Strangely,it has involved little physical change.No other species fills so many places in nature.But in the past 100,000 years一even the past 100 years一our lives have been transformed but our bodies have not. We did not evolve,because machines and society did it for us.Darwin had a phrase to describe those ignorant of evolution:"they look at an organic being as savage looks at a ship,as at something wholly beyond his comprehension."No doubt we will remember a 20th century way of life beyond comprehension for its ugliness. But however amazed our descendants may be at how far from Utopia we were,they will look just like us.What does the example of India illustrate?A:Wealthy people tend to have fewer children than poor people.B:Natural selection hardly works among the rich and the poor.C:The middle class population is 80%smaller than that of the tribes.D:India is one of the countries with a very high birth rate.
共用题干第一篇Human EvolutionBeing a man has always been dangerous.There are about 105 males born for every 100 females, but this ratio drops to near balance at the age of maturity,and among 70-year-old there are twice as many women as men. But the great universal of male mortality is being changed.Now,boy babies survive almost as well as girls do. This means that,for the first time,there will be an excess of boys in those crucial years when they are searching for a mate. More important,another chance for natural selection has been removed. Fifty years ago,the chance of a baby(particularly a boy baby)surviving depended on its weight. A kilogram too light or too heavy meant almost certain death.Today it makes almost no difference.Since much of the variation is due to genes,one more agent of evolution has gone.There is another way to commit evolutionary suicide:stay alive,but have fewer children.Few people are as fertile as in the past. Except in some religious communities,very few women have 15 children.Nowadays the number of births,like the age of death,has become average.Most of us have roughly the same number of offspring. Again,differences between people and the opportunity for natural selection to take advantage of it have diminished.India shows what is happening. The country offers wealth for a few in the great cities and poverty for the remaining tribal peoples.The grand mediocrity of today一everyone being the same in survival and number of offspring means that natural selection has lost 80%of its power in upper-middle一class India compared to the tribes.For us,this means that evolution is over;the biological Utopia has arrived.Strangely,it has involved little physical change.No other species fills so many places in nature.But in the past 100,000 years一even the past 100 years一our lives have been transformed but our bodies have not. We did not evolve,because machines and society did it for us.Darwin had a phrase to describe those ignorant of evolution:"they look at an organic being as savage looks at a ship,as at something wholly beyond his comprehension."No doubt we will remember a 20th century way of life beyond comprehension for its ugliness. But however amazed our descendants may be at how far from Utopia we were,they will look just like us.The author argues that our bodies have stopped evolving because______.A:life has been improved by technological advanceB:the number of female babies has been decliningC:our species has reached the highest stage of evolutionD:the difference between wealth and poverty is disappearing
共用题干第一篇Human EvolutionBeing a man has always been dangerous.There are about 105 males born for every 100 females, but this ratio drops to near balance at the age of maturity,and among 70-year-old there are twice as many women as men. But the great universal of male mortality is being changed.Now,boy babies survive almost as well as girls do. This means that,for the first time,there will be an excess of boys in those crucial years when they are searching for a mate. More important,another chance for natural selection has been removed. Fifty years ago,the chance of a baby(particularly a boy baby)surviving depended on its weight. A kilogram too light or too heavy meant almost certain death.Today it makes almost no difference.Since much of the variation is due to genes,one more agent of evolution has gone.There is another way to commit evolutionary suicide:stay alive,but have fewer children.Few people are as fertile as in the past. Except in some religious communities,very few women have 15 children.Nowadays the number of births,like the age of death,has become average.Most of us have roughly the same number of offspring. Again,differences between people and the opportunity for natural selection to take advantage of it have diminished.India shows what is happening. The country offers wealth for a few in the great cities and poverty for the remaining tribal peoples.The grand mediocrity of today一everyone being the same in survival and number of offspring means that natural selection has lost 80%of its power in upper-middle一class India compared to the tribes.For us,this means that evolution is over;the biological Utopia has arrived.Strangely,it has involved little physical change.No other species fills so many places in nature.But in the past 100,000 years一even the past 100 years一our lives have been transformed but our bodies have not. We did not evolve,because machines and society did it for us.Darwin had a phrase to describe those ignorant of evolution:"they look at an organic being as savage looks at a ship,as at something wholly beyond his comprehension."No doubt we will remember a 20th century way of life beyond comprehension for its ugliness. But however amazed our descendants may be at how far from Utopia we were,they will look just like us.Which of the following would be the best title for the passage?A:Sex Ration Changes in Human Evolution.B:Ways of Continuing Man's Evolution.C:The Evolutionary Future of Nature.D:Human Evolution Going Nowhere.
共用题干第一篇Human EvolutionBeing a man has always been dangerous.There are about 105 males born for every 100 females, but this ratio drops to near balance at the age of maturity,and among 70-year-old there are twice as many women as men. But the great universal of male mortality is being changed.Now,boy babies survive almost as well as girls do. This means that,for the first time,there will be an excess of boys in those crucial years when they are searching for a mate. More important,another chance for natural selection has been removed. Fifty years ago,the chance of a baby(particularly a boy baby)surviving depended on its weight. A kilogram too light or too heavy meant almost certain death.Today it makes almost no difference.Since much of the variation is due to genes,one more agent of evolution has gone.There is another way to commit evolutionary suicide:stay alive,but have fewer children.Few people are as fertile as in the past. Except in some religious communities,very few women have 15 children.Nowadays the number of births,like the age of death,has become average.Most of us have roughly the same number of offspring. Again,differences between people and the opportunity for natural selection to take advantage of it have diminished.India shows what is happening. The country offers wealth for a few in the great cities and poverty for the remaining tribal peoples.The grand mediocrity of today一everyone being the same in survival and number of offspring means that natural selection has lost 80%of its power in upper-middle一class India compared to the tribes.For us,this means that evolution is over;the biological Utopia has arrived.Strangely,it has involved little physical change.No other species fills so many places in nature.But in the past 100,000 years一even the past 100 years一our lives have been transformed but our bodies have not. We did not evolve,because machines and society did it for us.Darwin had a phrase to describe those ignorant of evolution:"they look at an organic being as savage looks at a ship,as at something wholly beyond his comprehension."No doubt we will remember a 20th century way of life beyond comprehension for its ugliness. But however amazed our descendants may be at how far from Utopia we were,they will look just like us.What does the last sentence mean?A:It means that we are still very far from Utopia.B:It means that our descendants look like us because of little biological change.C:It means that our descendants will not reach Utopia either.D:None of the above.
共用题干第一篇Human EvolutionBeing a man has always been dangerous.There are about 105 males born for every 100 females, but this ratio drops to near balance at the age of maturity,and among 70-year-old there are twice as many women as men. But the great universal of male mortality is being changed.Now,boy babies survive almost as well as girls do. This means that,for the first time,there will be an excess of boys in those crucial years when they are searching for a mate. More important,another chance for natural selection has been removed. Fifty years ago,the chance of a baby(particularly a boy baby)surviving depended on its weight. A kilogram too light or too heavy meant almost certain death.Today it makes almost no difference.Since much of the variation is due to genes,one more agent of evolution has gone.There is another way to commit evolutionary suicide:stay alive,but have fewer children.Few people are as fertile as in the past. Except in some religious communities,very few women have 15 children.Nowadays the number of births,like the age of death,has become average.Most of us have roughly the same number of offspring. Again,differences between people and the opportunity for natural selection to take advantage of it have diminished.India shows what is happening. The country offers wealth for a few in the great cities and poverty for the remaining tribal peoples.The grand mediocrity of today一everyone being the same in survival and number of offspring means that natural selection has lost 80%of its power in upper-middle一class India compared to the tribes.For us,this means that evolution is over;the biological Utopia has arrived.Strangely,it has involved little physical change.No other species fills so many places in nature.But in the past 100,000 years一even the past 100 years一our lives have been transformed but our bodies have not. We did not evolve,because machines and society did it for us.Darwin had a phrase to describe those ignorant of evolution:"they look at an organic being as savage looks at a ship,as at something wholly beyond his comprehension."No doubt we will remember a 20th century way of life beyond comprehension for its ugliness. But however amazed our descendants may be at how far from Utopia we were,they will look just like us.What used to be the danger in being a man according to the first paragraph?A:A lack of mates.B:A fierce competition.C:A lower survival rate.D:A defective gene.
共用题干第三篇The Balance between Fluency and AccuracyTo be able to speak English with fluency and accuracy is a goal of many Chinese English learners.Fluency can be simply defined as"being able to communicate ideas without having to stop and think too much about what one is saying";speaking accurately means"speaking without errors of grammar and vocabulary".However,the fact is that many students find that the faster they try to speak,the more mistakes they make.And,when they slow down,there may be fewer errors though it can sound unnatural. So,how to balance accuracy and fluency in spoken English?It can depend on the manner in which one has studied English in the past.People who tend to focus on accuracy may find that they worry too much about making mistakes.This can make them nervous or embarrassed about speaking English in public.As a result,their spoken English might not improve.This means that,although they know English grammar and vocabulary well,they might not be able to hold a good conversation.On the other hand,there are those who really like to talk and are willing to try their language out even if they make mistakes.This willingness to take risks helps them speak more fluidly.But,if they make a lot of mistakes,it may make it difficult for them to have their ideas understood.The debate about which is more important一fluency or accuracy一in the English language has lasted for a long time.Still,one thing is clear:neither of them should be absent if one is to speak a language well.How can we be sure that we can develop both?The following tips could help.Find the problem.What kind of person are you一one who focuses on accuracy or one who focuses on frequency?The first step is to recognize your problem and go to work on it.Think about situations where you've used English and how you felt about making mistakes?Do you always try some new language even though it might not be correct?Or do you feel embarrassed by mistakes?Focus on one problem at a time.When you speak English,find the mistakes you make most often.One mistake Chinese often make is omitting the"S"from the third person singular verb.Or you may speak too slowly as if you were searching for the right word and correct grammar. The next time you use English,try to work on those problems you have identified.If it's fluency,try to focus on it.If you have a problem with the third person singular,try to concentrate on when you make such errors.Don't spend time thinking about other mistakes.By choosing an area to work on,you can isolate problems and help yourself overcome them.Vary your practice.If you go to an English corner or an English club,try to change the types of activities you take part in so that you practice both fluency and accuracy.Public speaking allows you to slow down and be sure you have time to concentrate on the language.Meanwhile,discussions are good practice for fluency,especially if you don't stop each time a mistake is made.Tell the difference between fluency and speed.Some Chinese think that speaking fast is the same as speaking fluently.In fact,speaking fluently involves not only speed.It also involves stress, pronunciation and intonation. If you make a mistake in these,speaking fast will only make it worse. Don't sacrifice understanding for speed.Record yourself. Take a tape recorder and record a conversation with a friend or a speech or talk to yourself as you do it naturally!A two-or-three-minute recording is enough.When you've finished,listen to yourself. Can you find out any error and correct it?Make it a regular practice.The more you record yourself,the more confident and natural sounding you will become.Who are likely to feel nervous or embarrassed about speaking English in public?A:Those who focus on fluency.B:Those who focus on accuracy.C:Those who speaks fast.D:Those who record themselves.
Income tax【个人所得税】 For many young Americans, graduating from college means finding a job, moving out of the dorm room and beginning to register one's annual earnings with the US government. That last item is the law, though sometimes it's a hassle(难事)to obey. Independent tax advisor Bob Gilbert calls the US income tax system "amazingly complicated". But he adds that "very little of the complicated tax law applies to young people who are just beginning their careers". According to Gilbert, 80 to 90 percent of Americans are not really burdened by the system's complications. Still, all the numbers and forms can be a little confusing to those who are just starting their careers. Some pull out their calculators and try to do the math alone. Some use income tax software. Others just hand the whole responsibility over to tax firms like Gilbert's. According to income tax law expert Linda Beale, young people will often follow their parents' lead when filling their income forms. "Young people who grow up in wealthy households typically use professional tax services because their parents have always done so," said Beale, a professor at Wayne State University in Michigan State. "On the other hand, most poorer young people probably try to do their own taxes, unless they want a quick 'refund' with the help of a tax advisor". In fact, obeying the law has its benefits. For one, many young people can expect a tax refund. This means that, over the course of the year, they have paid too much in monthly federal or state taxes and are entitled to the difference. Bob Thalman, a 20-year-old university student, expects he will get a refund of about 100, which will probably go in the bank, or perhaps be used to pay for car insurance or credit card bills. Thalman called the whole process a "hassle", but added that he didn't wat to test the law by not filling his income tax papers. "I'm worried about what would happen if I failed to file," he said. "I know one individual who did not report his income tax for many years, and he's now in federal prison. I certainly don’t want that."文章(16~22)A college student with a part-time job is not required to file an income tax form.A.RightB.WrongC.Not mentioned