小题1:B
小题2:C
小题3:A
小题4:B
小题5:C
短文大意：这篇短文重点介绍了冰岛的温泉的行程以及人们对于这些地热资源的应用情况。
小题1:根据第一段Smoking volcanoes (火山), white steam (蒸汽) and hot springs are more amazing than the other sights including ice there 描述，可知火山，蒸汽和温泉是冰岛最迷人的景色。故选B。
小题2:联系前文White steam is rising from 描述，可知此处指的是蒸汽喷出的排放口。故选C。
小题3:根据第三段It starts nearly two kilometers under Blue Lake. There, water from the ocean continues moving up slowly into the spaces between hot rocks below the surface. And then the water is heated by hot rocks. Powerful machines and long pipes (水管) help bring the heated water to the surface. 描述，可知是海水慢慢进入地表下的热岩之中，然后由热岩加热，最后有管道从热岩中将热水导到地面。故选A。
小题4:根据第三段People in Iceland use natural hot water for hot springs. Besides, they use it to create electricity that can be used to heat homes and even greenhouses 描述，可知冰岛的人们将天然热水用于温泉和发电。故选B。
小题5:这篇短文重点介绍了冰岛的温泉的行程以及人们对于这些地热资源的应用情况。故选C。