evaluate unfortunate unfortunately fountain absolute absolutely fantastic crater potential impress precious novelist cancel effort relieve tremble sweat anxiety anxious panic courage typhoon heaven diverse diversity unique bathe swallow guarantee

　词组：compare ...with burn to the ground make an effort make one's way

　　　　glance through vary from ... to

3. 语法：the -ing form used as adverbial in a sentence

looking carefully at the ground , I made my way to the edge of the crater.

Having experienced quite a few earthquakes in Hawaii already, I didn't take much notice.

III．教材分析

　　本单元以the power of nature 为话题，旨在通过本单元教学使学生了解火山爆发，地震，台风，洪水，海啸等自然现象，认识到自然的伟大力量，并会用所学词汇描述在经历自然灾害时的感受，思考人类应对自然灾害的态度和方法，提高自我保护意识。

　　Warming up 通过对火山爆发示意图的探讨激活学生了解与本单元话题相关的背景知识，而后通过讨论人类应对自然灾害的措施引发学生对本单元话题的思考，激发学生的求知欲，为随后进行的听说读写打下基础。

Pre-reading 通过回答问题测试自己是否适合作火山学家，让学