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完形填空专项训练二 阅读下面的短文;文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。 Migrant Workers In the past twenty years, there has been an increasing tendency for workers to move from one country to another. While some countries have restricted most To local people, others have attracted and welcomed migrant workers. This is particularly the case in the Middle East, increased oil incomes have enabled many countries to call in outsiders to improve local facilities. Thus the Middle East has attracted oil-workers the U.S.A. and Europe. It has brought in workers from many countries, South Korea and Japan. In view of the difficult living and working in the Middle East, it is not surprising that the pay is high to attract suitable workers. Many engineers and technicians can at least twice as much money in the Middle East as they can in their own country, and this is a major ,Sometimes a disadvantage has a compensating advantage. For example, the living conditions often lead to increased friendship when workers, have to on each other for safety and comfort. In a similar way, many migrant workers can save large sums of money partly because of the of entertainment facilities. The work is often complex and full of problems but this merely greater challenge to engineers who prefer to find solutions to problems rather than do routine work in their home country. | 
