有人認為這可能是恐龍滅絕的原因如果是這樣那么未來ppt課件

1、導(dǎo)讀：據(jù)研討導(dǎo)讀：據(jù)研討,6500萬年前的小行星撞擊地球，萬年前的小行星撞擊地球，對地球呵斥了幾乎是消滅性的破壞，有人以為這對地球呵斥了幾乎是消滅性的破壞，有人以為這能夠是恐龍滅絕的緣由。假設(shè)是這樣，那么未來能夠是恐龍滅絕的緣由。假設(shè)是這樣，那么未來再有這樣的小行星或彗星撞擊地球，會不會導(dǎo)致再有這樣的小行星或彗星撞擊地球，會不會導(dǎo)致人類的消滅呢？人類的消滅呢？ Its said that a huge asteroid(小行星)smashed(撞擊) into the earth 65 million years ago, which certainly sent the earths eco

2、system(生態(tài)系統(tǒng)) into a disaster which took thousands of years to recover from. Scientists say that its probable that such disaster could happen again. Asteroids are rocky bodies which tend to live in orbits(軌道) between Mars and Jupiter. Comets, on the other hand, are a mix of rock and ice, and they can

3、 swing into the earths orbit from anywhere in the Solar System. Comets have an icy tail which reflects the sunand can therefore be seen from the earth. But asteroids have far less visibility(可見度) and have to be at least half a kilometre across to be found. There are millions of such rocky and icy bo

4、dies out there which have not been discovered yet. But did an asteroid kill the dinosaurs and could another kill us? Despite what you may have heard, it hasnt been proved that the hitting was the only reason for the dinosaurs dying out. But the asteroid which created thehitting would certainly have

5、had a great effect on the environment, and a mass extinction(滅絕)did take place around the time. So far we have no idea when the next one will be because we havent spotted it yet and not many organizations are spending money on asteroiddetection, because a deathly hitting is such a faraway possibilit

6、y. 請根據(jù)語義及提示寫出單詞1. There is a friendly _(氣氛)of helping each other with difficulties in study in our class. 2. Most of the students in China benefit from the new educational _(體制). 3. She listened with a _(困惑的)expression on her face. 4. I believe his words will do _(危害) to our company. 5. The warm spr

7、ing wind brush our faces _(輕柔地). 6. Nothing can _(阻止) him doing research into the issue of water pollution. 7. The results of the test are very _(令人振奮). 8. Health _(依賴于) upon good food, fresh air and enough sleep. atmosphere2. system 3. puzzled 4. harm 5. gently 6. prevent7. cheering8. depends 9. ex

8、istence 10. develop 9. In the opinion of some philosophers, everything in _(exist) is reasonable. 10. The best method of teaching, I think, is to _(啟迪) the mind of students. 請根據(jù)語義寫出短語1. _ system 太陽系2. _ time 及時，最終 3. _ birth to 生(孩子) 4. _ from 阻止5. _ out 阻撓6. _ up 喝彩雀躍7. _ that 既然8. _ out 迸發(fā)1. solar

9、 2. in 3. give 4. prevent5. block6. cheer7. now 8. break 1. What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe. (P25) 2. Although its origin may still be a puzzle, the moon can never be anything more than a satellite of the earth.

10、 (P28) harmful adj.根據(jù)語境猜詞義(1) Fruit juices can be harmful to childrens teeth. (2) Many households products are potentially harmful. 根據(jù)語義找匹配有害的B. 危害 (1) A(2) B harmful adj.鏈接鏈接harm n. 損傷；損傷； 損害損害 vt. 損傷損傷； 損害損害 harmless adj. 無害的；無害的； 無惡意的無惡意的 短語短語do sb. harm do harm to sb. 對某人有害對某人有害be harmful to 對對有

11、害有害 harmful adj.句型句型 It does no harm to do sth. /There is no harm (in) doing sth. 無妨做某事無妨做某事 It wouldnt do sb. any harm to do sth. 做某做某事對某人并無害處事對某人并無害處 No harm done! (對他人做錯事的一種勸慰對他人做錯事的一種勸慰) 沒事兒！沒事兒！ 不要緊！不要緊！ harmful adj. 單詞拼寫(1) Your smoking may be _ (有害) to the health of your baby. (2) The storm h

12、as done great _(有害) to the crops. (3) The dog seems fierce, but actually hes _. (1) harmful(2) harm(3) harmless harmful adj.根據(jù)語境猜詞義(1) The heavy rain prevented us (from) going to school. (2) They have been prevented by the traffic jam from going there on time. prevent v.根據(jù)語義找匹配A. 妨礙 B. 阻止 (1) B(2) A

13、 prevent v.鏈接鏈接“阻止某人做某事的幾種表達式：阻止某人做某事的幾種表達式：ban sb. from doing sth.stop sb. (from) doing sth.keep sb. from doing sth. prevent v. 單項填空()(1) We must take firm and efficient measures to prevent pollution _our life even better. A. to make B. making C. make D. against making A調(diào)查非謂語動詞的運用。此題的語義是： 為了使我們的生活更

14、加愉快，我們必需采取果斷而卓有效果的措施阻止污染。根據(jù)語境非謂語動詞在本句是目的狀語，所以答案是A。此題極容易呵斥學(xué)生們的思想定勢而誤選B。 prevent v.()(2) Well spare no effort to prevent the river _. A. from polluting B. polluting C. being polluted D. polluted C調(diào)查非謂語動詞的運用。此題的語義是：我們將不遺余力地阻止河流污染。根據(jù)語境河流與污染構(gòu)成了被動關(guān)系，所以答案是C。 prevent v.develop v.根據(jù)語境猜詞義(1) We should develop

15、 the habit of reading, because reading can develop the mind. (2) Shanghai has developed into a commercial center of our country. (3) We must develop many more new products in order to satisfy the demands of market. 根據(jù)語義找匹配A. 養(yǎng)成(習(xí)慣) B. 開展C. 開發(fā) (1) A(2) B(3) C develop v.鏈接鏈接developed adj. 興隆的興隆的 devel

16、oping adj. 開展中的開展中的 development n. 開展開展 develop v. 用develop的正確方式填空 With the _ of science and technology, some _ countries have developed into _ ones.development; developing; developeddevelop v. puzzle n&v.根據(jù)語境猜詞義(1) Its a puzzle to me why he hasnt come for my birthday party. (2) Can you help me

17、out with the math puzzle?(3) Her word puzzled him. (4) I was puzzled how to handle the situation. (1)B(2)C(3) A(4) D根據(jù)語義找匹配使迷惑不解B. 謎C. 難題D. 使為難 puzzle n&v.鏈接鏈接puzzling adj. 令人困惑的；使人感到困惑的令人困惑的；使人感到困惑的puzzled adj. 困惑的；感到困惑的困惑的；感到困惑的puzzlement n. 困惑，迷惑困惑，迷惑be in a puzzle about 對對大惑不解大惑不解work out a

18、puzzle 猜謎；處理難題猜謎；處理難題puzzle over 對對冥思苦想冥思苦想puzzle out (苦苦思索而苦苦思索而)搞清楚搞清楚puzzle ones brain about / over 對對而大傷腦筋而大傷腦筋 puzzle n&v. 用puzzle的正確方式填空 The (1) _ boy (2) _ his mother, so there was a (3) _ expression on her face. Much to (4) _ of his mother, he left home without saying a word. puzzling(2)

19、 puzzled (3) puzzled(4) puzzlement puzzle n&v. gentle adj.根據(jù)語境猜詞義(1) Mothers are always gentle with their children. (2) Its very comfortable to let the gentle wind blow on your face. 根據(jù)語義找匹配悄然的，輕柔的 B. 溫順的，文雅的 (1) B(2) A gentle adj.鏈接鏈接gentlelooking adj. 看起來彬彬有禮的、看起來很看起來彬彬有禮的、看起來很紳士的紳士的gentleman n. 紳士，先生紳士，先生gently adv. 溫順地，輕柔地，悄然地溫順地，輕柔地，悄然地 gentleness n. 溫順，和藹溫順，和藹短語短語be gentle with sb. 對某人體恤入微，對某人溫順有加對某人體恤入微，對某人溫順有加gentle in voice / action 聲音溫順，舉止文雅聲音溫順，舉止文雅have a gentle manner of doing sth. 做某事風(fēng)度高雅做某事風(fēng)度高雅 gentle adj.辨析