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

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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

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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