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What is found to have close relationship with rapid increase in population?A.War between 2 countries.B.Ways discovered to increase productivity.C.Migration from a continent to another continent.D.A new religion beginning to be accepted by people.

A.War
B.B.Ways
C.C.Migration
D.D.A

【参考答案】

B

[注释] 必须在通读全文之后通过对各细节的概括才能得知：每一次都与生产力和......

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