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  3. Migration is usually defined as "permanent or semi-permanent change of residence". However, our concern is with movement between

Migration is usually defined as "permanent or semi-permanent change of residence". However, our concern is with movement between

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问题     Migration is usually defined as "permanent or semi-permanent change of residence". However, our concern is with movement between nations, not with internal migration within nations, although such movements often exceed international movements in volume. Today, the motives of people who move short distances are very similar to those of international migrants.
    Students of human migration speak of "push" and "pull" factors, which influence an individual’s decision to move from one place to another. 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 war, or severe famine. Obviously, refugees who leave their homes with guns pointed at their heads 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 often these are economic, such as better job opportunities or the availability of good land to farm. 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. When there is a choice between several attractive potential destinations, the deciding factor might be a non-economic consideration such as the presence of relatives, friends, or at least fellow countrymen already established in the new place who are willing to help the newcomers settle in.
    Besides push and pull factors, there are what the sociologists call "intervening obstacles." Even if push and (or) pull factors are very strong 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 prospect of packing up everything and moving to a new and perhaps very strange environment may appear interesting and challenging to an unmarried young man and appallingly difficult to a slightly older man with a wife and small kids. Similarly, the need to learn a new language and customs may excite one person and frighten another. Regardless of why people move, migration of large numbers of people causes conflict. The United States and other western countries have experienced adjustment problems with each new wave of immigrants. It has usually taken several decades for each group to be accepted into the mainstream of society in the host country.
选项 A、are all related to economic considerations
B、are not as decisive as push factors
C、include a variety of considerations
D、are more important than push factors
答案C
解析 这是一道细节题。题干中的信号词为pull factors，出自第三段第一句话。文章第三段指出：吸引因素与目的地有关，这些因素通常是经济方面的，当面临几个有吸引力的潜在目的地时，决定因素就可能是非经济方面的因素。这说明，吸引因素包括经济和非经济两方面的动因。C说“包括各种各样的因素”，这与作者的观点符合。A明显与该段的意思不符；文中没有比较吸引因素和驱动因素，所以B和D不对。
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