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首页>英语>课件>Unit 2《Topic 2 All these problems are very serious》Section C 课件(仁爱版九年级上)

Unit 2《Topic 2 All these problems are very serious》Section C 课件(仁爱版九年级上)

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资料类别:  英语/课件 所属版本:  仁爱英语
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Unit 2 Saving the Earth Topic 2 All these problems are very serious. Section C Teaching aims and demands 1. Learn some new words and phrases: law, turn off, tap, on earth, ozone layer, carbon, period, millions of, take away, pollute, oxygen, radiation, blanket, escape, rise, the greenhouse effect, level, refer 2. Learn some useful sentences: (1) When it rains or when the wind blows, the earth is taken away. (2) The heat from the sun can’t escape so the temperature is rising. 3. Learn to talk about the harm of pollution: (1) Forests have become deserts, so more and more sorts of animals and plants are disappearing. (2) As a result, many rivers and lakes are now dead. (3) Too much harmful radiation from the sun passes through the hole and reaches the earth directly. (4) It causes the level of the oceans to rise and the climate of the earth to change. 4. Develop the students’ sense of environmental protection. New words on earth 在地球上;究竟,到底 ozone layer 臭氧层 carbon 二氧化碳 period n. 时期,时代 millions of 无数的,大量的,数以百万计的 take away 拿走 pollute v. 无染 oxygen n. 氧气 radiation n. 放射,放射物 blanket n. 毛毯,毯子 escape v.&n. 逃跑;逃脱 rise v. 上升,上涨 the greener house effect 温室效应 level n. 水平线,水平 △Mars n. 火星 refer to 提到,涉及,有关 1a Read and understand Can you choose a suitable title for each paragraph from the phrases below? traffic pollution fewer trees the Ozone layer factory pollution more carbon dioxide The earth is 4 600 million years old. We humans have lived on earth for only 35 000 years, but during this period we have changed our planet a lot in many ways. Some things we’ve done are very good for the earth while some are bad. ______ All over the world, people have cut down million of trees. When it rains or when the wind blows, the earth is taken away. Forests have become deserts, so more and more sorts of animals and plants are disappearing. ______ In big cities, cars and buses have polluted the air. Many people in cities now have health problems. 【点击播放】 ______ Factories have also polluted the land and the water. As a result, many rivers and lakes are now dead. ______ Around the earth, there’s a special kind of oxygen called “ozone (O3)”. It is important to the earth. But now air pollution is destroying it and that has made a very big hole in the ozone layer. Too much harmful radiation from the sun passes through the hole and reaches the earth directly. This is very dangerous because this kind of radiation can cause cancer. ______ Carbon dioxide (CO2) in the air has increased a lot. It mainly comes from burning oil, coal and wood. This had formed a “blanket” around the earth. The heat from the sun can’t escape so the temperature is rising. This is called “the greenhouse effect”. It causes the level of the oceans to rise and the climate of the earth to change. all these problems are very serious, so we must do something now. 1b Work alone Read 1a again and choose the correct answers. 1. What does our planet mean here? A. The sun B. Mars C. The moon D. The earth 2. Which is NOT true? A. Cars can pollute the air B. Factories can pollute the water C. The fewer trees, the better D. Not all the things we have done are good for the earth 3. The world it in the passage refer to ______. A. CO2 B. O3 C. O2 D. H2O 4. In the passage, “blanket” refers to ______. A. carbon dioxide around the earth B. the ozone layer in the sky C. the forests around the world D. pollution all over the world 5. The level of the oceans is rising because of ______. A. pollution B. few trees C. the greenhouse effect D. changes in the climate 6. What is the best title for this passage? A. Environmental Problems B. Pollution on the Earth C. Hope for the Future D. The Greenhouse Effect 2 Write work Discuss the meanings of the following expressions and then write down how they affect the environment. O3: _________________________ Ozone is very important to the earth. … ______________________________________ ______________________________________ ______________________________________ CO2: ________________________________ The greenhouse effect: __________________ More and more carbon dioxide forms a “blanket” around the earth. … ______________________________________ ______________________________________ Explanation 1. Some things we’ve done are very good for the earth while some are bad. 我们所做的一些事情对地球有益,然而另一些却对地球有着负面影响。 (1)we’ve done 为定语从句,修饰things。 (2)while 这里为并列连词,意为“然而,而。 如: Her sister likes reading while she likes singing. 她妹妹喜欢看书,而她喜欢唱歌。 They went out, while she stayed at home. 他们出去了,而她留在家里。 2. All over the world people have cut down millions of trees. 在全世界,人们已经砍伐了数以百万计的树木。 million, thousand, hundred等数词的复数形式后接of短语,表示数以百万(千、百)计的,指不确定的数目。如: Men have been making music for thousands of years. 人类创作音乐已有数千年的历史。 3. When it rains or when the wind blows, the earth is taken away. 当刮风下雨的时候土就被刮走或冲走。 take away 拿走,取走 如: I don’t like these books. Please take them away.我不喜欢这些书,请把它们拿走。 take off 脱下,(飞机)起飞;take … 把…带到…去;take sb. for a walk 带某人去散步;take one’s time别着急,慢慢干;take a bus(ship/train…)乘公共汽车(轮船/火车……) take turns 轮流,替换;take care of 照看;It takes sb. time/ money to do sth. 花费某人时间/金钱做某事;take a look 看一看;take photos 拍照;take a holiday 度假;take a rest 休息一下;take a seat 坐下 【拓展】 take的有关短语: 4. As a result, many rivers and lakes are now dead. 结果,现在许多河流湖泊已经没了生机。 be dead 死的,表示一种状态。这里指“无生气的,死气沉沉的”。 【链接】 die v. 死;death n. 死亡;dead adj. 死的 Exercises 1. The boy fell into the river, but luckily, he ______ by the soldier. A. saved B. was saved C. has saved D. was saving 2. Now some kinds of animals are becoming ______. A. few and few B. fewer and fewer C. less and less D. more and more few 单项选择。 B B 3. ______ it was so cold, ______ he went out without an overcoat. A. Although; but B. Although; / C. Although; so D. But; and 4. People have cut down ______ trees all over the world. A. million of B. millions C. ten millions D. millions of 5. Either my parents or my brother ______ to see me. A. is coming B. are coming C. come D. have come B D A Write an article about the pollution. Homework

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