GMAT考试阅读资料(三)a

Passage 15
　　In the two decades between 1910 and 1930， overten percent to the Black population of the United Statesleft the South， where the preponderance of the Blackpopulation had been located， and migrated to northern（5） states， with the largest number moving， it is claimed，between 1916 and 1918. It has been frequently assumed，but not proved， that the majority of the migrants inwhat has come to be called the Great Migration¹ camefrom rural areas and were motivated by two concurrent（10） factors： the collapse² of the cotton industry followingthe boll weevil infestation³， which began in 1898， andincreased demand in the North for labor⁴ followingthe cessation of European immigration caused by theoutbreak of the First World War in 1914. This assump-（15） tion has led to the conclusion that the migrants‘ subse-quent lack of economic mobility⁵ in the North is tied torural background， a background that implies unfamil-　　iarity with urban living and a lack of industrial skills.
　　But the question of who actually left the South has（20） never been rigorously investigated. Although numerous　 investigations⁷ document an exodus⁸ from rural southernareas to southern cities prior to the Great Migration.no one has considered whether the same migrants thenmoved on to northern cities. In 1910 over 600，000（25） Black workers， or ten percent of the Black work force，reported themselves to be engaged in “manufacturingand mechanical pursuits，” the federal census⁹ categoryroughly encompassing¹⁰ the entire industrial sector¹¹. TheGreat Migration could easily have been made up entirely（30） of this group and their families. It is perhaps surprising　to argue that an employed population could be enticedto move， but an explanation lies in the labor conditionsthen prevalent in the South.
　　About thirty-five percent of the urban Black popu-（35） lation in the South was engaged in skilled trades. Some　 were from the old artisan class of slavery-blacksmiths.masons， carpenters-which had had a monopoly ofcertain trades， but they were gradually being pushedout by competition， mechanization， and obsolescence¹²，（40） The remaining sixty-five percent， more recently urban-ized， worked in newly developed industries——tobacco.lumber¹³， coal and iron manufacture， and railroads.Wages in the South， however， were low， and Blackworkers were aware， through labor recruiters and the（45）Black press， that they could earn more even as unskilledworkers in the North than they could as artisans in theSouth. After the boll weevil infestation， urban Blackworkers faced competition from the continuing influxof both Black and White rural workers， who were driven（50） to undercut the wages formerly¹⁴ paid for industrial jobs.Thus， a move north would be seen as advantageousto a group that was already urbanized and steadilyemployed， and the easy conclusion tying their subse-quent economic problems in the North to their ruralbackground comes into question.

　　1. The author indicates explicitly¹⁵ that which of the　following records has been a source of information in　her investigation⁶？
　　　（A） United States Immigration Service reports from 1914 to 1930
　　　（B） Payrolls¹⁶ of southern manufacturing firms between　1910 and 1930
　　　（C） The volume of cotton exports between 1898 and 1910
　　　（D） The federal census of 1910
　　　（E） Advertisements of labor recruiters appearing in southern newspapers after 1910

　　2. In the passage， the author anticipates which of the following as a possible objection to her argument？
　　　（A） It is uncertain how many people actually migrated during the Great Migration.
　　　（B） The eventual¹⁷ economic status of the Great Migration migrants has not been adequately traced.
　　　（C） It is not likely that people with steady jobs would have reason to move to another area of the country.
　　　（D） It is not true that the term “manufacturing and mechanical pursuits” actually encompasses¹⁸ the entire industrial sector.
　　　（E） Of the Black workers living in southern cities， only those in a small number of trades were threatened by obsolescence.

　　3. According to the passage， which of the following is true of wages in southern cities in 1910？
　　　（A） They were being pushed lower as a result of increased competition.
　　　（B） They had begun t to rise so that southern industry could attract rural workers.
　　　（C） They had increased for skilled workers but decreased for unskilled workers.
　　　（D） They had increased in large southern cities butdecreased in small southern cities.
　　　（E） They had increased in newly developed industries but decreased in the older trades.

　　4. The author cites each of the following as possible influences in a Black worker‘s decision to migrate north in the Great Migration EXCEPT
　　　（A） wage levels in northern cities
　　　（B） labor recruiters
　　　（C） competition from rural workers
　　　（D） voting rights in northern states
　　　（E） the Black press

　　5. It can be inferred from the passage that the “easy　conclusion” mentioned in line 53 is based on which　of the following assumptions？
　　　（A） People who migrate from rural areas to large cities usually do so for economic reasons.
　　　（B） Most people who leave rural areas to take jobs in　 cities return to rural areas as soon as it is financially possible for them to do so.
　　　（C） People with rural backgrounds are less likely to succeed economically in cities than are those with urban backgrounds.
　　　（D） Most people who were once skilled workers are not willing to work as unskilled workers.
　　　（E） People who migrate from their birthplaces to other regions of country seldom undertake a second migration.

　　6. The primary purpose of the passage is to
　　　（A） support an alternative to an accepted methodology
　　　（B） present evidence that resolves a contradiction
　　　（C） introduce a recently discovered source of information
　　　（D） challenge a widely accepted explanation
　　　（E） argue that a discarded theory deserves new attention

　　7. According to information in the passage， which of the　 following is a correct sequence of groups of workers，from highest paid to lowest paid， in the period between　 1910 and 1930？
　　　（A） Artisans in the North； artisans in the South； unskilled workers in the North； unskilled workers in the South
　　　（B） Artisans in the North and South； unskilled workers in the North； unskilled workers in the South
　　　（C） Artisans in the North； unskilled workers in the North； artisans in the South
　　　（D） Artisans in the North and South； unskilled urban workers in the North； unskilled rural workers in the South
　　　（E） Artisans in the North and South， unskilled rural workers in the North and South； unskilled urban workers in the North and South

　　8. The material in the passage would be most relevant to a long discussion of which of the following topics？
　　　（A） The reasons for the subsequent economic difficulties of those who participated in the Great Migration
　　　（B） The effect of migration on the regional economies of the United States following the First World War
　　　（C） The transition from a rural to an urban existence for those who migrated in the Great Migration
　　　（D） The transformation of the agricultural South following the boll weevil infestation
　　　（E） The disappearance of the artisan class in the United States as a consequence of mechanization in the early twentieth century