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In the second half of the twentieth century, many countries of the South began to send students to the industrialized countries

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问题      In the second half of the twentieth century, many countries of the South began to send students to the industrialized countries for further education. They urgently needed supplies of highly trained personnel to implement a concept of development based on modernization.
     But, unfortunately, many of these students decided to stay on in the developed countries when they had finished their training. At the same time, many professionals who did return home but no longer felt at ease there also decided to go back to the countries where they had studied. This migration was encouraged by developed countries which offered attractive conditions to keep the services of those they had trained--people whose training had often been paid for by their home country.
     In the 1960s, some Latin American countries tried to solve this problem by setting up special" re turn" programs to encourage their professionals to come back home. These programs received support from international bodies such as the International Organization for Migration, which in 1947 enabled over 1600 qualified scientists and technicians to return to Latin America.
     In the t980s and 1990s, "temporary return programs were set up in order to make the best use of trained personnel occupying strategic positions in the developed countries. This gave rise to the United Nations Development Program’s Transfer of Knowledge through Expatriate Nationals, which encourages technicians and scientists to work in their own countries for short periods. But the brain drain from these countries increases in response to the new laws of the international market in knowledge. The rich countries are far better placed than the developing countries to attract and/or to keep trained personnel.
     Recent studies forecast that the most developed countries are going to need more and more highly qualified professionals--around twice as many as their educational systems will be able to produce, or so it is thought. As a result there is an urgent need for developing countries which send students a broad to give preference to fields where they need competent people to give muscle to their own institutions, in stead of encouraging the training of people who may not come back because there are no professional outlets for them. The countries of the South must not be content with institutional structures that simply take back professionals sent abroad, and they must introduce flexible administrative procedures to encourage them to return. If they do not do this, the brain drain is bound to continue.
What can be inferred from the last paragraph?
选项 A、Developed countries will employ more qualified professionals from the countries of the South.
B、If no effective methods are adopted by the countries of the South, brain drain will not stop.
C、The educational systems in the developed countries are not very efficient.
D、It is of no use that the developing countries encourage their trained professionals to return.
答案B
解析 文章最后一段所介绍的发达国家需要人才的情况，和发展中国家的情况，是为了说明最后一句，如果发展中国家不采取相应的措施，如弹性的管理机制，人才会继续流失。 A与文意不符，虽然文中说发达国家需要更多的人才，但不能推导出A所说情况。 C文章没有提及。D与文意不符，文章并不是说发展中国家鼓励人才回国没用，而是它们应采取相应的措施。
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