单选题
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 16 to local people, others have attracted and welcomed migrant workers. This is particularly the case in the Middle East, 17 increased oil incomes have enabled many countries to call in outsiders to improve local facilities. Thus the Middle East has attracted oil-workers 18 the U.S. A. and Europe. It has brought in workers from many countries, 19 South Korea and Japan.
In view of the difficult living and working 20 in the Middle East, it is not surprising that the pay is high to attract suitable workers. Many engineers and technicians can 21 at least twice as much money in the Middle East as they can in their own country, and this is a major 22 .
Sometimes a disadvantage has a compensating (补偿的) advantage. For example, the 23 living conditions often lead to increased friendship when workers have to 24 on each other for safety and comfort. In a similar way, many migrant workers can save large sums of money partly because of the 25 of entertainment facilities. The work is often complex and full of problems but this merely 26 greater challenge to engineers who prefer to find solutions to problems rather than do routine work in their home country.
One major problem which 27 migrant workers in the Middle East is that their jobs are temporary ones. They are nearly always on 28 , so it is not easy for them to plan ahead with great confidence. This is to be 29 since no country welcomes a large number of foreign workers as permanent residents. In any 30 , migrant workers accept this disadvantage, along with others, because of the considerable financial benefits which they receive.