发布时间 : 星期四 文章2019-2020学年高中英语人教版必修三Unit4全单元教案更新完毕开始阅读dd7d625ef58a6529647d27284b73f242336c318a
Ss: The explosion of the earth produced water vapor, which turned into water when the earth cooled down.
T: Why is water important on the earth?
Ss: Because water allowed the earth to dissolve harmful gases into the oceans and seas.
T: No.3, finish the following form.
Key to the exercise:
2. shellfish and all sorts of fish 5.amphibian(on land and in water) 7. reptiles (on land) 8.dinosaurs(on land) 9.mammals(on land) T: That’s all for this passage. Now let’s deal with some language points. Passage Analyzing Chart of the text
How life began on the earth 4 insects(on land) 5 amphibians(on land and in water) 6 forests 2 shellfish and all sorts of fish 3 green plants on land water 1 small plants in water 6 forests 7 8 9 3 green plants on land 4insects(on land) 5 1 small plants in water 2 7 reptiles (on land) 8 dinosaurs (on land) 9 mammals (on land)
Text Retelling
Retell the text using about 100 words.
10. small clever animals with hands and feet 11. human Notes: Use the two questions and the chart to retell the passage; the possible version below can be used as a material for both retelling and dictation. Retelling:
The explosion of the earth produced water vapour, which turned into water when
the earth cooled down. Water allowed the earth to dissolve harmful gases into the oceans and seas. That made it possible for life to begin to develop. The arrival of small plants encouraged the development of early shellfish and all sorts of fish. Many millions of years later the first green plants began to appear on land. Later land animals appeared. Some were insects. Others, call beginning with two questions so as to arouse the readers’ strong curiosity and interest.
2) The passage tells the readers the scientific idea in order of time. Water made everything possible on the earth. Then all kinds of plants and animals appeared. At last mankind rule the world, but they are not taking care of the earth very well. So the readers will think about a question carefully: What will our earth be in the future? 2. Writing Style
The text is common science writing, which tells the readers how the universe developed and how life began on the earth. It provides a scientific background to any investigation into space and it’s factual. It’s written in a formal way. And all the information is based on scientific research. 3. Main Idea
Through the writer’s clear description, we know that how life began on the earth. It’s a long and slow process. From the passage, we know that earth is the best place for
human to live on. But humans didn’t take good care of it in the past. Now we are facing many environmental problems now. What should we human do? Everyone who reads the passage will think about this problem. We should pay more attention to taking care of our earth. Taking good care of the earth means taking good care of ourselves.
Step Ⅵ Homework
Retell the passage according to the form.
Remember important language points.
Second period Extensive reading
Read and then describe the three ways in which gravity changed for Li Yanping and how his weight changed.
1. The pull of gravity became very strong she left the earth’s atmosphere. His weight is normal.
2. It disappeared when he was in space. He is weightless.
3. It was very light when he was on the moon. He weighs less than on earth. Explanation (略)见课件
Third period Grammar
What part does the underlined part serve as in each sentence? A tree has fallen across the road. You are a student. To find your way can be a problem. Smoking is bad for you. “How do you do?” is a greeting. What she said is not yet known. That we shall be late is certain. It is certain that we shall be late. We can see from these sentences that a sentence serves as subject, so we call it Subject Clause. 主语从句
（Noun Clauses as the Subject） 定义：
用作主语的从句叫主语从句，它是名词性从句之一。引导主语从句的连接词有：连词that, whether；连接代词who, what和which；连接副词when, where, how和why。
1) 由what等代词引起的主语从句：
What the teacher said today was quite right. 老师今天说的话是十分正确的。 2) 由连词that引起的主语从句：
That they are badly in need of help is quite clear. 他们急需帮助，这是十分明显的。
但是这类句子在大多数情况下会放到整个句子的后部去，而用代词it作形式主语。
3) 由连接代词或连接副词以及whether引起的主语从句。 Whether they will sell the house is not yet decided. 他们是否卖掉这所房子还没有决定。 4) whatever, whoever也可引导主语从句。 Whatever was said here must be kept secret. 这里说的话都应当保密。
Whoever makes mistakes must correct them. 凡犯了错误的人都必须改正。
注意: 上述例句中的主语从句都是放在句首, 但有时为了使句子结构平衡, 避免 “头重脚轻”, 常用 it 作形式主语, 而把从句放在后面。 例如: It is a pity that she has made such a mistake. 她犯了这样一个错误, 真是遗憾。 这样就构成了下面一些常用句型: 1) It is + adj. / n. + 从句
It is a pity/shame that... 遗憾的是…… It is possible that... 很可能……