单项选择题

Which of the following groups is NOT mentioned as migrants in the passage

A．Farmers.
B．Workers.
C．Settlers.
D．Colonizers.
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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.
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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