[单项选择]In the decades between 1910 and 1930, over ten percent of the Black population of the United States left the South, where the majority of the Black population had been located, and migrated to northern states, with the largest number moving, it is claimed, between 1916 and 1918. It has been frequently assumed, but not proved, that most of the migrants in what has come to be called the Great Migration came from rural areas and were motivated by two concurrent factors: the collapse of cotton industry following boll-weevil infestation, which began in 1898, and increased demand in the North for labor following the cessation of European immigration caused by the outbreak of the first World War in 1914. This assumption has led to the conclusion that the migrant’s subsequent lack of economic mobility in the North is tied to rural background, a background that implies unfamiliarity with urban living and a lack of industrial skills.
But the question of who actually left the South has never
A. immigration Service reports in 1930
B. the First World War in 1918
C. the federal census in 1910
D. southern newspapers in 1898

[单项选择]In the decades between 1910 and 1930, over ten percent of the Black population of the United States left the South, where the majority of the Black population had been located, and migrated to northern states, with the largest number moving, it is claimed, between 1916 and 1918. It has been frequently assumed, but not proved, that most of the migrants in what has come to be called the Great Migration came from rural areas and were motivated by two concurrent factors: the collapse of cotton industry following boll-weevil infestation, which began in 1898, and increased demand in the North for labor following the cessation of European immigration caused by the outbreak of the first World War in 1914. This assumption has led to the conclusion that the migrant’s subsequent lack of economic mobility in the North is tied to rural background, a background that implies unfamiliarity with urban living and a lack of industrial skills.
But the question of who actually left the South has never
A. They were being pushed lower as a result of increased competition.
B. They began 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 but decreased in small southern ones.

[单项选择]

In the two decades between 1910 and 1930, over ten percent of the Black population of the United States left the South, where the majority of the Black population had been located, and migrated to northern states, with the largest number moving, it is claimed, between 1916 and 1918. It has been frequently assumed, but not proved, that most of the migrants in what has come to be called the Great Migration came from rural areas and were motivated by two concurrent factors: the collapse of cotton industry following boll weevil infestation, which began in 1898, and increased demand in the North for labor following the cessation of European immigration caused by the outbreak of the First World War in 1914. This assumption has led to the conclusion that the migrants’ subsequent lack of economic mobility in the North is tied to rural background, a background that implies unfamiliarity with urban living and a lack of industrial skills.
But the question of who actually left
A. United States Immigration Service reports from 1914 to 1930
B. The volume of cotton exports between 1898 and 1910
C. The federal census of 1910
D. Advertisements of labor recruiters appearing in southern newspapers after 1910