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.One possible version：

　　Life_is_not_easy._As_students,_we_should_learn_how_to_protect_ourselves_in_the_school.

　　When an earthquake happens, first we should calm down, which is the most important. Shouting and crying is of no use. Follow the teacher's guidance and keep our actions in order. Second, hide beneath our desks with our schoolbags on our heads if we are in class. That can keep us a little safer. Be sure not to jump off the building. Third, if we are on the playground, do not move. Sit on our feet and use hands to cover our heads so that they can be kept from being hit on. At last, help each other. When we are faced with natural disasters, individual power is tiny. Only by uniting can we overcome the difficulties.

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