单项选择题

According to Kingsley Davis, migration occurs as a result of the following reasons EXCEPT

A．human adaptability.
B．human evolution.
C．cultural differences.
D．inter-group inequalities.
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单项选择题
Ricci is compared to Columbus in the passage mainly because
A．they both benefited from Italian sponsors.
B．they were explorers in their own ways.
C．they obtained overseas sponsorship.
D．they got a warm reception in America.
单项选择题
Which of the following statements is INCORRECT
A．Migration exerts a great impact on population change.
B．Migration contributes to mankind's progress.
C．Migration brings about desirable and undesirable effects.
D．Migration may not be accompanied by human conflicts.
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