单项选择题

Which of the following statements concerning banning GM foods is true according to the passage

A．Underdeveloped countries have banned GM foods.
B．Both Europe and the U.S. have banned GM foods.
C．Most European countries have not banned GM foods.
D．The United States has not banned GM foods.

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单项选择题

We can learn from the first paragraph that _____________.

A．the collapse of the cotton industry and increased demand in the Northern for labor caused the Great Migration
B．the black workers were used to urban living quite well
C．wages were pretty low in northern cities
D．the black workers in the North earned less than they did in south with the development of the mechanization

单项选择题

Which of the following records has been a source of information in the author's 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.

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