人教版必修3-Unit-4-How-Life-Began-on-the-Earth學(xué)案

1、人教版必修 3 Un it 4 How Life Began on the Earth學(xué)案學(xué)習(xí)目標(biāo)：Learning the test學(xué)習(xí)課文教學(xué)重點： Get the ma in idea of the text 了解文章大意課前準(zhǔn)備請同學(xué)們提前閱讀學(xué)案容，了解課堂上要完成的任務(wù)，1準(zhǔn)備17導(dǎo)學(xué)案2課本Page 25-26的課文Teachi ng Steps ；教學(xué)步驟Step 1 Have a check檢查上節(jié)課的容Step 2 Learn the text of Page 25-26 學(xué)習(xí) Page 25-26 課文1 Fast Readi ng關(guān)注課文中的數(shù)字，找出所發(fā)生的事件bil

2、li onyearsagoMany million years laterfor140millionyears65 million years ago2.6 million years ago2 Careful Reading仔細(xì)閱讀課文 歸納段落大意Para 123 4 3 Careful reading 細(xì)讀課文 完成排序AIn sects and amphibia nsappearedBDinosaurs appearedC The earth became a solid ballD Small pla nts grew on the waterE Reptiles appearedF

3、Plants began to grow on dry landG The earth was a cloud of dustH Water appeared on the earth.I Shellfish and other fish appearedJ The un iverse began with a BIG BANGK Clever ani mals with hands and feet appearedL MammalsappearedStep 3 Th ink思考Is it wrong or right to show films with dinosaurs andpeop

4、le together? Why?在課文中找到適宜的語句，或根據(jù)自己的 理解答復(fù)此題Step 4 A quit of the text 當(dāng)堂檢測，課文容填空The uni verse bega n with a .At that time, theearth was.The n, the earth became.After that, water appeared on the earth and rew on the water .Then, shellfish and other fishappeared . Next,began to grow on dry land andin se

5、ctsa ndamphibians. Later,reptilesa nddino saursappeared.Last,cleverani mals ppeared and spread all over the earth.Thus,the human become the most important animals on the earth .However; they are not look ing after the earth well. They areputting too muchcarbon dioxide into the , whichprevents heates

6、caping from the o space. Sowhether life will continue on the earth for millions of yearsto comewill on whether this problem can be solved.Step4課文知識點1. In our solar system eight planets circle around the sun.在我們的太陽系里，八大行星繞著太陽運轉(zhuǎn)。solar system 太陽系八大行星：Uran us 天王星、Ven us金星、Earth地球、Mars 火星、Mercur

7、y 水星、Jupiter木星、Neptune 海王星、Saturn 土星2. Can you match the names with the planets?Matchto/with 將配對，與相匹配Match the words with the destinations.把這些詞與釋義相連。3. The origin of life on earth is a question that interestsastronomers.地球上生命的起源是一個使天文學(xué)家感興趣的問題。the origi n of life生命的起源 that in terests astro no mers定語從

8、句4. According to a widely accepted theory, the universe began with a “ Big Bang that threw matter in all directi on s.一種普遍為人們所承受的理論是：宇宙起源于一次大爆炸，這次大爆炸將物質(zhì)投 射到四面八方。a widely accepted theory一種普遍為人們所承受的理論beg in/start with 以 開始 end up with 以完畢A thousand Li journey starts/begins with the first step.千里之行，始于足

9、下。5. The earth was still a cloud of dust. 一團塵埃6. What it was to become was uncertain until between 4.5 and 3.8 million years ago whe n 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。What it was to become主語從句be to do sth常用來表示不可防止將要發(fā)生的事。As a young man he didn ' t

10、know he was to win world fame later on.年輕時，他不知道自己日后會舉世聞名。settle in/into sth安排下來；習(xí)慣于新居；適應(yīng)新工作settle dow n安靜下來，平靜下來7. It exploded loudly with fire and rock.They were in time to producecarb on, n itroge n, water vapour and other gases, which were to makethe earth ' s atmosphere.它地球猛烈的爆炸噴出了烈火與巖石，最終產(chǎn)生

11、了碳、氮氣、水蒸氣和其它 多種氣體，從而形成了地球的大氣層。in time 與時最終，遲早You will learn how to do it in time.你遲早能學(xué)會做這件事。The doctor came just in time.醫(yī)生與時地趕至 U 了。which were to make the earth ' s atmosphere. 非限制性定語從句8. What is even more more important is that as the earth cooled down waterbegan to appear on its surface.更為重要的

12、是，地球冷卻了下來，地球的表面就開始出現(xiàn)了水。What is eve n more more importa nt主語從句cool down變涼，冷卻下來as 隨著后面加從句=with加名詞或動名詞As time goes by, I get used to the weather here.=With time going by, I get used to the weather here.隨著時間的進展，我習(xí)慣了這兒的天氣。9.It was not immediately obvious that water was to be fun dame ntal to the developm

13、e nt of life.水會對生命的開展起關(guān)鍵作用，這一點在當(dāng)時并不是很明顯。It is obvious that =lt is clear that 彳艮明顯It is obvious that you are wrong.很顯然，你是錯誤的。10. What many scientists believe is that the continued presenee of waterallowed the earth to dissolve harmful gases and acids into the oceans and seas.很多科學(xué)家相信，由于地球上長期有水存在，使地球得以

14、把有害氣體和酸性物質(zhì) 溶解在海洋里。What many scie ntists believe主語從句that引導(dǎo)的是表語從句allow/permit sb to do sth允許某人做某事allow/permit doing sth允許做某事dissolve harmful gases and acids into the ocea ns and seas.把有害氣體和酸性物質(zhì)溶解在海洋里。dissolveinto 把溶解在11. They produced young gen erally by laying eggs.它們一般是通過孵蛋而繁衍后代的。by doi ng用于說明做某事的手段

15、、方式。He used to make his liv ing by painting.他以前是靠畫畫為生。12. They are putt ing too much carb on dioxide into the atmosphere, which preve nts heat from escap ing from the earth into space.他們把過多的二氧化碳釋放到大氣層中，這使得地球上的熱不能釋放到太空中 去。which preve nts heat from escap ing from the earth into space.非限制性定語從句preve nt/

16、stop (from)doi ng sth 阻止做某事=keep from doing sthHis heart trouble didn ' t prevent him (from) going to class the next day. 他的心臟病沒能阻止他第二天去上課。Noth ing can preve nt their pla ns (from) being carried out.什么也不能阻止他們的方案得以實施。13.So whether life will continue on the earth for milli ons of years tocome will depe