1. The author indicates explicitly that which of the following records has been a source of information in her investigation？
（A） United States Immigration Service reports from 1914 to 1930
（B） Payrolls 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 eventual 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 encompasses 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 but decreased in small southern cities.
（E） They had increased in newly developed industries but decreased in the older trades.