According to Kingsley Davis, migration occurs as a result of the foll-考呗网题库移动版
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A.human adaptability.  
B.human evolution.
C.cultural differences.
D.inter-group inequalities.

参考答案B
解析:

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A.depending on shared conventions. 
B.fashioning their own conventions.
C.adjusting their personal feelings.  
D.elaborating a common language.

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