单选题：Migrant （移民的） Workers　　In the past twenty years, there has b

　　Migrant （移民的） Workers　　In the past twenty years, there has been anincreasing tendency for workers to move from one country to another. While somecountries have restricted most __________（51） to local people, others have attracted and welcomed migrant workers.This is particularly the case in the Middle East, __________（52） increased oil incomes have enabled many countriesto call in outsiders to improve local facilities.Thus the Middle East has attractedoil-workers __________（53） the U.S.A. andEurope. It has brought in workers from many countries, （54） South Korea and Japan.
　　In view of the difficult living and working__________ （55） in the Middle East, it is not surprising that the pay is high toattract suitable workers. Many engineers and technicians can __________ （56） atleast twice as much money in the Middlie East as they can in their own country,and this is a major __________（57）.
　　Sometimes a disadvantage has a compensating（补偿的） advantage. For example,the __________ （58）living conditions often lead to increased friendship when workers have to __________（59） on each other for safety and comfort. In a similar way, many migrant workerscan save large sums of money partly because of the __________（60） of entertainment facilities. The work isoften complex and full of problems but this merely __________ （61） greater challengeto engineers who prefer to find solutions to problems rather than do routine workin their home country.
　　One major problem which __________ （62） migrantworkers in the Middle East is that their jobs are temporary ones. They are nearlyalways on __________ （63）, so it is not easy for them to plan ahead with great confidence.This is to be __________ （64）since no country welcomes a large number of foreignworkers as permanent residents.In any __________（65）, migrant workers accept this disadvantage,along with others,because of the considerable financial benefits which they receive. A．cases
B．jobs
C．activities
D．uses