深圳高级中学（集团）25届高三第二学期英语学科测试（一） 满分120分，考试用时120分钟 命题人：高三英语备课组 审题人：高三英语备课组 第二部分阅读（共两节，满分50分） 第一节（共15小题：每小题2.5分，满分37.5分） 阅读下列短文。从每题所给的A、B、C和D四个选项中选出最佳选项。 ·What are geysers Geysers are types of hot springs which periodically shoot a column of steaming water high into the air.They occur in areas of volcanic activity where hot lava is found close to the Earth's surface. The name comes from the Icelandic verb geysa,to gush. ·How do geysers work Geysers only form under very specific conditions.There must be ample groundwater,an underground heat source;and a plumbing system'made up of reservoirs and vertical passages or pipes'through which heated water travels on its way to the geyser Earth's surface. Cool water on the Earth's surface trickles down through hot poro(多孔渗水的)rock.As it approaches the heat source spring (hot rocks or a magma chamber)it is heated to extremely high temperatures and starts to rise through a "pipe".The water would usually turn to steam but its depth,plus the stream porou weight of cooler water above it,creates what is called a reservoir confining pressure that prevents the superheated water from superheated water boiling and turning to steam.As the water rises this pressure lessens and steam finally forms and is trapped in the porous roch reservoir.Over time the pressure in the reservoir continues to build until the steam forces the water upwards through the magma passage to the surface of the Earth,where it erupts through a chamber vent in a spectacular column of steaming water. The 'plumbing system'of a geyser 第1页，共10页
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