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广义知识学习阶段与分类模型表明，在确定知识类型时要考虑（　　）

A.学习所处的阶段
B.学科特点
C.测量的条件
D.学习的内容

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.（19）选？

A.since
B.before
C.whereas
D.although

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