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【C1】______: for highly skilled people to go on working well into【C2】______was once thought to be old age. Across the rich world,well-educated people【C3】______work longer than the less-skilled. Some 65% of American men aged 62-74 with a professional degree are in the【C4】______, compared with 32% of men with only a high-school certificate. In the European Union the pattern is similar. This【C5】______is part of a deepening divide between the well-educated【C6】______and the unskilled poor that is slicing【C7】______all age groups. Rapid innovation has raised the incomes of the highly skilled while【C8】______those of the unskilled. Those at the top are working longer hours each year than those at the bottom.【C9】______the well-qualified are extending their working lives, compared with those of less-educated people. The【C10】______, for individuals and society,are profound. The world is on the【C11】______rise in the number of old people, and they will live longer than ever before.【C12】______the next 20 years the global population of those aged 65 or more will almost double, from 600m to 1.1 billion. The【C13】______of the 20th century, when greater longevity translated into more years in retirement【C14】______more years at work, has persuaded many observers that this shift will【C15】______slower economic growth and "secular stagnation" , while the【C16】______ranks of pensioners will bust government budgets. But the notion of a sharp division between the working young and the【C17】______old misses a new trend, the【C18】______gap between the skilled and the unskilled. Employment rates are falling among younger unskilled people,【C19】______older skilled folk are working longer. The divide is most extreme in America, where well-educated baby-boomers are【C20】______retirement while many less-skilled younger people have dropped out of the workforce.

【C15】

A．turn to
B．lean to
C．tend to
D．lead to