Topic 2 All these problems are very serious.Section C课件（18张PPT)

课件18张PPT。Unit 2 Saving the Earth Topic 2 All these problems are very serious. Section C九英上学习目标 1、学习并能说出、写出P39—40的生词，并能进行英汉互译
2、熟读1a，能够说出1a中重要的知识点，能够熟练做题。 【?自学指导1】
1.自学内容：课本P39—40的生词。
2.自学方法：先根据音标试读，同桌互相正
音，提问。
3.自学时间：5分钟
4.自学要求：会读，知道其汉语意思，并能
英汉互译。【自学检测1 】英译汉
hole_____ form _____ blanket _____
escape _____ rise _____ take away _____
the greenhouse effect ________
refer to ________【自学指导2 】
1.自学内容：课本39页1a
2.自学方法：听录音并扫读1a。
3.自学时间：8分钟
4.自学要求：完成1b; 和1c.【自学检测2】 听录音完成1b1b Read 1a and complete the following tasks. 2.What does our planet mean here?
A. The sun. B. Mars.
C. The moon. D. The earth.3.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 world4.The word it in Paragraph5 refers to ____.
A. CO2 B. O3 C. O2 D. H2O5. What is the best title for this passage ?
Environment Problems B. Pollution on the Earth
C. Hope for the Future D. The Greenhouse Effect Write down only the key words when taking notes. 1c Complete the notes according to 1a. 【自学检测2】Retell it cars and buses pollute air, health problemspollute land and water, rivers and lakes deadharmful radiation reaches the earth, cause cancer factory pollution ozone hole more CO2【自学指导3】
1.自学内容：课本39页1a
2.自学方法：精读
3.自学时间：10分钟
4.自学要求：能够说出1a中重要的知识点Choose suitable titles for Paragraphs 2-6. Then write it down in front of each paragraph. The earth is 4.6 billion years old. We humans have lived on the 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 millions of trees. When it rains or when the wind blows, the earth is taken away. Forests have become deserts, so many kinds of animals and plants are disappearing.Fewer TreesA. Traffic pollution B. Factory pollution C. Fewer trees D. The ozone hole E. More carbon dioxide ____________ In big cities, cars and buses have polluted the air. Now many people in cities have health problems._____________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 making 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. Traffic PollutionFactory Pollution The Ozone Layer直接地 ________________ Carbon dioxide (CO2) in the air has increased a lot. It mainly comes from burning oil, coal and wood. This has 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.More Carbon Dioxide1.Some things we’ve done are very good for the earth while some are bad
①Some things we’ve done ---定语从句 我们已经做过的事情,在句子中作主语，
②while 并列连词，“而，却”，表示对照关系。
2.When it rains or when the wind blows the earth is taken away.take away 拿走，取走, 句子中是被动语态
3.The heat from the sun can’t escape so the temperature is rising.rise --- 升起，上升 (不及物动词)
拓展：raise ①举起，提起，抬起 ； ② 筹集 (及物动词)要 点 归 纳【自学检测3】
翻译下面的句子
1.我们所做的一些事情对地球有益，而其他的一些对地球有害。
_____________________________
2.当刮风下雨的时候，土就会被刮走或冲走。
___________________________
3.来自太阳的热量不能散发，所以气温升高
____________________________
4.所有这些问题都非常严重，因此我们现在必须采取措施。
___________________________________
5.结果，现在许多河流湖泊已经没有了生机
____________________________________ Some things we’ve done are very good for the earth while some are bad.When it rains or when the wind blows, the earth is taken away.The heat from the sun can’t escape so the temperature is rising.All these problems are very serious, so we must do something now.As a result, many rivers and lakes are now dead.(1)________ of us knows how to stop the bad behavior.
(2) I knocked on the door but ___________ answered.
(3) Some of these books are better than__________.
(4) She was driving the car with one hand and wiping the window with the _______.
(5) They are beautiful but I am looking for ___________ useful.
(6) Is there ___________ you can do to help her?
(7) There’re 5 000 people living here and almost _________has his/her own car.
(8) He’s cleverer than ____________ I know.
(9) I’ve looked __________ but I can’t find it.Fill in the blanks using something, anything, others, nobody, everyone, anybody, everywhere, none, other.Nonenobodyothersothersomethinganythingeveryoneanybodyeverywhere【当堂训练 】We learn: 1. Some words: hole, form, rise
2. Some phrases: take away,
refer to
3. Some sentences:
All these problems are very serious, so we
must do something now.
We can: 1. Talk about the harm of pollution.
2. Combine the key points to form a
short passage.
SummaryThank you