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The third main type of volcano is the extinct volcano.Extinct volcanoes are inactive and have never erupted over the course of human history. There are many extinct volcanoes around the world including Mount Kilimanjaro (in Tanzania),Mount Warning (in Australia),and La Chained des Puys (in France).While they are inactive now, some volcanoes take more than a million years to reactivate after erupting. For this reason, many scientists argue there is no point in determining whether a volcano is dormant or extinct.

大家先自己理解下整个段落，然后给大家分析下不太需要读的地方：

The third main type of volcano (文章主题在讲火山，重复多的字眼不是重点词汇，忽略)is the extinct volcano(段落主旨) .Extinct volcanoes are inactive and have never erupted(否定词汇，考点) over the course of human history(时间状语不重要，忽略或快速阅读，除非题目考与时间相关的题目) . There are many extinct volcanoes (强调句型，关注)around the world including Mount Kilimanjaro (in Tanzania),Mount Warning (in Australia),and La Chained des Puys (in France)(地点状语不重要，忽略或快速阅读，除非题目考和地点相关的题目).While they are inactive now(尽管，紧挨着的句子不重要，重点看转折后的句子！), some volcanoes take more than a million years to reactivate after erupting(对数字要敏感). For this reason(过度短语，忽略) ,many scientist argue there is no point(强调句型，否定考点，作者观点！必读)in determining whether a volcano is dormant or extinct. (具体结论，考点。)