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

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.

单项选择题

It can be inferred from the passage that easy conclusion (Para. 3 ) is based on the assumptions that

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

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