Ⅱ.本文讲述的是Grimsvom火山爆发的原因以及火山爆发带来的坏处。

　　16．A　细节理解题。由第二段的第二句What makes Grimsvom different is that it lies under a huge glacier(冰川) of ice up to 12 meters thick.可知它有别于其他火山是因为它位于巨大冰川之下，故选A。

　　17．D　细节理解题。由第二段中的This layer of water puts pressure on the volcano, keeping it stable.可知水的压力让它稳定，故选D。

　　18．C　A、B、D项在文中没有提到，由最后一段The eruption has also caused problems for animals in Iceland.…Farmers are keeping their animals inside to stop them from eating ash­covered grass or the sharp object.可知选C。

　　19．B　推理判断题。通读全文可知这是一篇资讯报道，故选B。

　　Ⅲ.Hiking has become popular in China during recent years, and more and more people become hikers, who are

　　Donkey Friends(驴友)in Chinese.A discussion about hiking has

　　held in our class.Some students think that hiking during vacations can make people ③to　feel healthier, fresher and more harmonious with nature.They find themselves

　　attracted by the beauty of nature.They can also be

　　walking in deep mountains. But nowadays some hikers even begin to explore the places people have never

　　been to, and accidents have ⑥been　 happened now and then because

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