北科计算机的入学考研怎么样啊？

社会化

A.不存在
B.仅含一个非零解向量
C.含有两个线性无关的解向量
D.含有三个线性无关的解向量

Warren Buffett,who will host Berkshire Hathaway's annual shareholders'meeting on May 3rd,is an icon of American capitalism.At 83,he also epitomizes a striking demographic（1）:for highly skilled people to go on working well into（2）was once thought to be old age.Across the rich world,well-educated people（3）work longer than the less-skilled.Some 65%o of American menaged 62-74 with a professional degree are in the（4）compared with 32%of men with only a high-school certificate.In the European Union the pattern is similar This（5）is part of a deepening divide between the well-educated（6）and the unskilled poor that is slicing（7）all age groups.Rapid innovation has raised the incomes of the highly skilled while（8）those of the unskilled.Those at the top are working longer hours each year than those at the bottom（9）the l1-qualified are extending their working lives,compared with those of less-educated people.The（10）for individuals and society,are profound The world is on the（11）rise in the number of old people,and they will live longer than ever efore.（12）the next 20 years the global population of those aged 65 or more will almost double from 600m to 1.1 billion The（13）of the 20th century,when greater longevity translated into more years in retirement（14）more years at work,has persuaded many observers that this shift will（15）slower economic growth and"secular stagnation",while the（16）ranks of pensioners will bust government budgets But the notion of a sharp division between the working young and the（17）old misses a new trend,the（18）gap between the skilled and the unskilled.Employment rates are falling among younger unskilled people,（19）older skilled folk are working longer.The divide is most extreme in America,where well-educated baby-boomers are（20）retirement while many less-skilled youn but overseas job markets and foreign government policies favor technology experts From a long-term perspective,it is a positive thing that more than 80 percent of those who pursue education overseas return to China after completing their studies and contribute to the country's economy But the notion of a sharp division between the working young and the（17）old misses a new trend,the（18）gap between the skilled and the unskilled.Employment rates are falling among younger unskilled people,（19）older skilled folk are working longer.The divide is most extreme in America,where well-educated baby-boomers are（20）retirement while many less-skilled younger people have dropped out of the workforce.（1）选？

A.sight
B.trend
C.sign
D.track

Text 3 There are plenty of good reasons for a young person to choose to go to university:intellectual growth,career opportunities,having fun.Governments are keen on higher education,seeing it as a means to boost social mobility and economic growth.But they tend to overestimate the benefits and ignore the costs of expanding university education.As more young people seek degrees,the returns both to them and to governments are lower.Employers demand degrees for jobs that never required them in the past and have not become more demanding since.In a desperate attempt to stand out,students are studying even longer,and delaying work,to obtain master's degrees.Part of the usefulness of a degree is that it gives a graduate jobseeker an advantage at the expense of non-graduates.It is also a signal to employers of general qualities,such as intelligence and diligence,which someone already has in order to get into a universiry.Some professions require qualifications.But a degree is not always the best measure of the skills and knowledge needed for a job.With degrees so common,recruiters are using them as a crude way to screen applicants.Non-graduates are thus increasingly locked out of decent work.In any case,the premium counts only the winners and not the losers.Across the rich world,a third of university entrants never graduate.It is the weakest students who are drawn in as higher education expands and who are most likely to drop out.They pay fees and sacrifice earnings to study,but see little boost in their future incomes.Many school-leavers are being misled about the probable value of universitty.Governments need to offer the young a wider range of options afier school.They should start by rethinking their own hiring practices.School-leavers should be given a wider variety of ways to gain vocational skills and to demonstrate their employability in the private sector.Ifschool qualifications were made more rigorous,recruiters would be more likely to trust them as signals of ability,and less insistent on degrees.Such measures would be more efficient at developing the skills that boost productvity and should save public money.To promote social mobility,govemments would do better to direct funds to early-school education and to helping students who would benefit from university but cannot afford it.Young people,both rich and poor,are ill-served by the arms race in academic qualifications,in which each must study longer because that is what all the rest are doing.It is time to disarm.Students are studying longer to______

A.get master's degree
B.make themselves noticeable
C.find a decent work
D.obtain higher retums