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

,導讀：據(jù)研究,6500萬年前的小行星撞擊地球，對地球造成了幾乎是毀滅性的破壞，有人認為這可能是恐龍滅絕的原因。如果是這樣，那么未來再有這樣的小行星或彗星撞擊地球，會不會導致人類的毀滅呢？,Its said that a huge asteroid(小行星)smashed(撞擊) into the earth 65 million years ago, which certainly sent the earths ecosystem(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 swing into the earths orbit from anywhere in the Solar System. Comets have an icy tail which reflects the sun,and 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 bodies 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 the,hitting would certainly have 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 possibility.,請根據(jù)語義及提示寫出單詞 1. There is a friendly _(氛圍)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 spring 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.,atmosphere 2. system 3. puzzled 4. harm 5. gently 6. prevent 7. cheering 8. depends 9. existence 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 阻擋 6. _ up 歡呼雀躍 7. _ that 既然 8. _ out 爆發(fā),1. solar 2. in 3. give 4. prevent 5. block 6. cheer 7. 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. (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 harm n. 傷害； 損害 vt. 傷害； 損害 harmless adj. 無害的； 無惡意的 短語 do sb. harm do harm to sb. 對某人有害 be harmful to 對有害, harmful adj.,句型 It does no harm to do sth. /There is no harm (in) doing sth. 不妨做某事 It wouldnt do sb. any harm to do sth. 做某事對某人并無害處 No harm done! (對別人做錯事的一種勸慰) 沒事兒！ 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 has 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. 阻礙 B. 阻止,(1) B (2) A, prevent v.,鏈接 “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 考查非謂語動詞的使用。本題的語義是： 為了使我們的生活更加美好，我們必須采取果斷而卓有成效的措施阻止污染。根據(jù)語境非謂語動詞在本句是目的狀語，所以答案是A。本題極容易造成學生們的思維定勢而誤選B。, prevent v.,( )(2) Well spare no effort to prevent the river _. A. from polluting B. polluting C. being polluted D. polluted,C 考查非謂語動詞的使用。本題的語義是：我們將不遺余力地阻止河流污染。根據(jù)語境河流與污染形成了被動關(guān)系，所以答案是C。, prevent v.,develop v.,根據(jù)語境猜詞義 (1) We should develop 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(習慣) B. 發(fā)展 C. 開發(fā),(1) A (2) B (3) C,develop v.,鏈接 developed adj. 發(fā)達的 developing adj. 發(fā)展中的 development n. 發(fā)展,develop v.,用develop的正確形式填空 With the _ of science and technology, some _ countries have developed into _ ones.,development; developing; developed,develop 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 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 puzzling adj. 令人困惑的；使人感到困惑的 puzzled adj. 困惑的；感到困惑的 puzzlement n. 困惑，迷惑 be in a puzzle about 對大惑不解 work out a puzzle 猜謎；解決難題 puzzle over 對冥思苦想 puzzle out (苦苦思索而)搞清楚 puzzle ones brain about / over 對而大傷腦筋, puzzle n&v.,用puzzle的正確形式填空 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) 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 輕輕的，輕柔的 B. 溫柔的，文雅的,(1) B (2) A, gentle adj.,鏈接 gentlelooking adj. 看起來彬彬有禮的、看起來很紳士的 gentleman n. 紳士，先生 gently adv. 溫柔地，輕柔地，輕輕地 gentleness n. 溫柔，和善 短語 be gentle with sb. 對某人體貼入微，對某人溫柔有加 gentle in voice / action 聲音溫柔，舉止文雅 have a gentle m