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
Which of the following groups is NOT mentioned as migrants in the passage
A．Farmers.
B．Workers.
C．Settlers.
D．Colonizers.
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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