单选题
英语六级
2017-04-06
A．Human activity.
B．Wind and water.
C．Chemical processes.
D．Fire and fury.
参考答案
B
答案解析
What caused the volcano’s outer layers to wear away?
B。短文在描绘魔鬼塔的形成过程时提到，地心熔岩冲出地面形成了火山颈，火山岩冷却硬化后，收缩碎裂变成了长形的柱子，即魔鬼塔。后来，火山的外层不断被风和水侵蚀，露出了坚硬的核心部分。由此可知，火山外层是被风和水侵蚀掉的，故答案为B。
B。短文在描绘魔鬼塔的形成过程时提到，地心熔岩冲出地面形成了火山颈，火山岩冷却硬化后，收缩碎裂变成了长形的柱子，即魔鬼塔。后来，火山的外层不断被风和水侵蚀，露出了坚硬的核心部分。由此可知，火山外层是被风和水侵蚀掉的，故答案为B。
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