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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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

There seems to be a(n) ______ relationship between great events and migration.

A．loose
B．indefinite
C．causal
D．remote