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1、Topic 2 All these problems are very serious.Section C一、教学目标1、Teaching and learning aims and demands.New words and phrases.take away _ oxygen/ /_, _hole/ /_, _ozone layer/ /_radiation/ /_, _directly/ /_, _carbon dioxide/ /_, _form/ /_, _blanket/ /_, _escape/ /_, _rise/ /_, _the greenhouse effect_refe
2、r / / to_Talking about the cause and effect.Indefinite Pronoun and Adverb.2、Teaching and learning difficult points.Too much harmful radiation from the sun passes through the hole and reaches the earth directly.翻译：_It causes the level of the oceans to rise and the climate of the earth to change.翻译：_二
3、、自主预习：1、翻译：在此期间全世界雨下得很大风刮得厉害土壤流失一种特殊的叫臭氧的氧对重要对某人来说做某事很重要太多有害射线穿过这个洞走过街道构成一条环绕地球的毯子温室效应引起海平面上升引起地球气候变化2、Choose suitable title for Paragraphs 26. Then write it down in front of each paragraph.A、Traffic pollution B、Factory pollution C、Fewer treesD、The Ozone hole E、More carbon dioxide三、合作探究1、When it rai
4、ns or when the wind blows, the earth is taken away. Too much harmful radiation reaches the earth directly.这两句中的earth是指同一事物吗？如果不是，第一句中的earth指_，第二句中的earth指_。earth着重指与天空相对的“土地”，还泛指泥土；soil主要指用于种植庄稼的“土壤”；ground主要指大地表面；land着重指与河湖、海洋相对的陆地。翻译：把树放进坑里，然后用土重新将坑填满。_日光、空气、水分和土壤对植物生长不可或缺。_那个包掉到地上了。_大片的良田消失了。_2、So
5、me things we have done are very good for the earth while others are bad.句中while _(词性) _(意思)相当于_.I was watching TV while my mother was reading novels last night.此句中while _(词性) _（意思）翻译：他是工人而我是教师。_下雨的时候，他在操场上跑步。_3、Skim 1a, then try to finish 1b.Play the mp3. Students listen and repeat. Then read it alt
6、ogether.4、Answer some questions about the passage.How old is the earth?How long have humans lived on the earth?What can ozone do for humans?What are the disadvantages of“the blanket”?四、当堂评价：1、Retell the passage with the help of the key words.2、rise, _, _ raise _, _翻译：太阳从东方升起，西方落下。_暴雨使洪水水位上涨。_五、课后检测：1、Rectte paragraphs 5 and 6 of the passage. 2、Finish wb Exx.
