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A．city
B．tribe
C．country
D．society
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单项选择题What is the main idea of the passage

A．The map of Europe is the product of several major early migrations.
B．Human migrations within recorded history have changed the world.
C．The overseas migration of Europeans totaled about 60 million people.
D．The first major wave of migration began in the 1840's.

单项选择题What had been the trend of migration during the 20th century

A．The movement from rural to urban areas.
B．The movement from urban to rural areas.
C．The movement from Europe to America.
D．The movement from Africa to America.