单项选择题

The last but one paragraph aims to ______.

A．support the preceding argument.
B．define what human migration is.
C．refute the preceding argument.
D．initiate a new argument.
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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.
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.
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