What caused great migrations of animals and plants?

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问题 What caused great migrations of animals and plants?
  
During the past 1. 65 million years, there have been four major episodes of global cooling, which resulted in great migrations of animals and plants. Yet, the earth remained.
Food shortage in Africa is becoming more and more serious due to the relentless spread of desert, high population growth, bad governance, and the world community’s flawed hunger-response system.

选项 A、Growing area of desert.
B、Increasing number of population.
C、Corrupted officials of the government.
D、Inefficient hunger-response system of the international community.

答案C

解析 虽然选项都对原文所提到的几个原因进行了同义替换,但可以发现A、B、D三项都与原文意思相符,只有C与原文所说的“bad governance”不符,原文指的是治理不当,并非是官员腐败,故C是正确选项。
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