高中英語《Unit4 Astronomy the science of the stars》教案（3）新人教版必修3

1、Period 3 Language points in readingTeaching Goals:1. To get Ss to better understand the text.2. To help Ss the master the usages of important words and expression3. To get Ss to analyze the difficult sentences of the text.Teaching Procedures:Step I Read and find out the difficulties Divide Ss into g

2、roups, ask them to read in groups and find out the difficult expressions and sentences.Step II Explanation of difficulties Ask students to list out their difficulties on blackboard. By discussing, students can solve some of them. Analyze the difficulties below:1. What it was to become was uncertain

3、until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe. 隨后它會變成什么沒人能知道，直到38-45億年前，這團塵埃才慢慢地形成一個固體的球狀物?！痉治觥?a. 此復合句的主句為What it was to become was uncertain；從句為_引導 的定語從句。when b. 主句中包含一個由what引導的主語從句What it was to become。c. until是介詞，與其前帶否定前綴的形容詞uncertain構成not . until句式，表示“到才，在

4、之前”，引導between 4.5 and 3.8 billion years ago作時間狀語。 這句話還可以這樣表述：Nobody knew what the cloud of dust would become before it turned into a solid globe between 4.5 and 3.8 billion years ago.2. The earth became so violent that it was not clear whether the shape would last or not. a. 此復合句的主句為The earth became

5、 so violent；從句為_引導的結果狀語從句。thatb. so . that . 如此以致，其中that可以省略。c. 結果狀語從句中包含一個由whether引導的主語從句，_是形式主語。it這句話還可以這樣表述：People didnt know whether the solid globe would keep the shape or not, because the earth didnt stop exploding.3. They were in time to produce carbon, ., which were to make the earths atmosp

6、here. in time: sooner or later; eventuallye.g. Ill see him in time. in time (for sth. /to do sth.): not latee.g. She will be back in time to prepare dinner.與time相關的短語: in no time 立刻, 馬上 at times 有時 at a time 每次; 依次 once upon a time 從前 on time 按時; 準時 at one time 從前 for the time being 暫時 from time to

7、time 不時地 atmosphere意為“大氣，氣氛等”。e.g. There was an atmosphere of violence and insecurity. 他們之間以前有種相互信任的氣氛。4. What is even more important is that as the earth cooled down, water began to appear on its surface. 【分析】a. 本句的結構是：主語從句（What is even more important）+ 系動詞（is）+ 表語從句（that as the earth . on its surf

8、ace.）b. 表語從句中含有一個由_引導的時間狀語從句。這句話還可以這樣表述：Water began to appear on the earth because it cooled down, and this is more important.5. This produced a chain reaction, which made it possible for life to develop.【考點】it作形式賓語，真正賓語常為不定式或從句。【考例1】We feel _ our duty to make our country a better place. AA. it B. t

9、his C. that D. one【考例2】Why dont you bring _ to his attention that youre too ill to work on?BA. that B. it C. his D. him【點撥】都選it。都考查it作形式賓語?？祭?中，it指代to make our country a better place；考例2中，it指代 _。that youre too ill to work on6. They produced young generally by laying eggs.lay-laid-laid-laying 放, 把.放在

10、.; 產(chǎn)卵e.g. He laid his books on the desk.注意: lay (laid; laid; laying) 放置; 產(chǎn)卵 lie (lay; lain; lying) 躺; 位于 lie (lied; lied; lying) 說謊 7. , because they gave birth to young baby animals . 【寓詞于境】仔細閱讀下列句子，并試著總結give birth to的含義及用法。1) Mrs. White gave birth to a fine healthy baby in her late thirties.2) Mar

11、y gave birth to a healthy baby girl.3) It was this event that gave birth to the peace movement. 【歸納】 give birth to后可直接跟名詞，意為“_” （句1和句2），也可意為“_”（句3）。分娩 產(chǎn)生【拓展】at birth 出生時 since / from birth 自出生后 date of birth 出生日期8. They are putting too much carbon dioxide into the atmosphere, which prevents heat fro

12、m escaping from the earth into space.他們把太多的二氧化碳釋放到大氣層中, 這就使得熱量不能從地球上散發(fā)到太空中去。閱讀下列句子, 注意prevent . from的意思和用法。1) There was nothing to prevent her from doing so.2) We must prevent the water from being polluted.3) The emperor ordered his porters to prevent the speaker entering the building. 歸納 prevent . fr