Scholars of human migration speak of two main factors that influence an individual’s decision to move from one place to another-push and pull factors. Push factors are associated with the place of origin. A push factor can be as simple and mild a matter as difficulty in finding a suitable job, or as traumatic as religious persecution, war, or severe famine Obviously, refugees who leave their homes with guns pointed at their heads or with hate-filled mobs at their heels are motivated almost entirely by push factors (although pull factors do influence their choice of destination).
Pull factors are those associated with the place of destination. Most of these are economic, such as better job opportunities or the availability of good land to farm. The latter was an important factor in attracting settlers to the United States during the nineteenth century. In general, pull factors add up to an apparently better chance for a good life and material well-being than is offered by the place of origin.
Besides push and pull factors, there are what the sociologists call " intervening obstacles " . Even if push and/or pull factors are very p, they still may be outweighed by intervening obstacles, such as the distance of the move, the trouble and cost of moving, the difficulty of entering the new country, and the problems likely to be encountered on arrival.
The decision to move is also influenced by " personal factors " of the potential migrant. The same push-pull factors and obstacles operate differently on different people, sometimes because they are at different stages of their lives, or just because of their varied abilities and personalities. The prospect of pulling up stakes and moving to a new and perhaps very strange environment may appear interesting and challenging to a young, footloose man and appallingly difficult to a slightly older man with a wife and young children. Similarly, the need to learn a new language and customs may intrigue one person and frighten another.
Regardless of why people move, migration of large numbers of people causes friction. The United States and other " receiving countries " (the term used for countries that welcome large numbers of migrants) have experienced adjustment problems with each new wave of immigrants. The newest arrivals are usually given the lowest-paying jobs and are resented by natives who may have to compete with them for those jobs. It has usually taken several decades for each group to gain acceptance in the mainstream of society in the receiving country.
According to the author, the immigrants in America, （）
A. have friction with Americans
B. are reluctant to blend in the mainstream
C. often find it difficult to seek high-paying jobs
D. went to America in the 19th country for a better job
参考答案：C
解析：
细节题。第五段第三句提到“The newest arrivals are usually given the lowest paying jobs and are resented by natives who may have to compete with them for those jobs.”(新来的移民通常只能得到最低薪水的工作，同时还招致那些可能不得不与他们一起竞争职位的本地人的怨恨。)因此C项正确。最后一段首句提到“Regardless of why people move, migration of large numbers of people causes friction.”(不管移民的原因是什么，大规模移民总会引起冲突。)由此可知，移民引起摩擦并不一定仅指他们与美国人之间的矛盾，故排除A项；第五段末句提到“It has usually taken several decades for each group to gain acceptance in the mainstream of society in the receiving country.”(每一批的移民者通常都要花费几十年的时间才能融入这些(移民)接受国家的主流社会。)可见移民不是不愿意融入主流社会，因此B项不正确；第二段第二、三句提到“…or the availability of good land to farm. The lager was an important factor in attracting settlers to the United States during the nineteenth century.”(或有好地耕种。而后者正是19世纪吸引移民迁往关国的重要原因之一。)可见，土地才是19世纪吸引移民到美国的重要原因，故排除D项。