题目内容
(请给出正确答案)
提问人:网友linfangdu
发布时间:2022-01-07
[主观题]
According to the passage, why has migration been called the greatest challenge of the comi
ng century?
A.Because of the change of population.
B.Because of the coming of the new century.
C.Because of economic and political effects.
D.Because of human beings' conflicts.
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