因果逻辑练习

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（1）According to paragraph 3, the abundance of resources fluctuated sharply after the end of the glacial period because 

（2）According to paragraph 2, why were tokens eliminated?

（3）According to paragraph 1, pastoralists in Iran needed to move their animals for which of the following reasons?

（4）According to paragraph 3, why do materials in the countryside have a lower heat capacity than materials in cities do?

（5）According to paragraph 5, surfaces in the city are generally drier than surfaces in the countryside between periods of rainfall because