有人认为这可能是恐龙灭绝的原因如果是这样那么未来ppt课件

1、导读：据研讨导读：据研讨,6500万年前的小行星撞击地球，万年前的小行星撞击地球，对地球呵斥了几乎是消灭性的破坏，有人以为这对地球呵斥了几乎是消灭性的破坏，有人以为这能够是恐龙灭绝的缘由。假设是这样，那么未来能够是恐龙灭绝的缘由。假设是这样，那么未来再有这样的小行星或彗星撞击地球，会不会导致再有这样的小行星或彗星撞击地球，会不会导致人类的消灭呢？人类的消灭呢？ Its said that a huge asteroid(小行星)smashed(撞击) into the earth 65 million years ago, which certainly sent the earths eco

2、system(生态系统) 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(轨道) 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(可见度) 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(灭绝)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. 请根据语义及提示写出单词1. There is a friendly _(气氛)of helping each other with difficulties in study in our class. 2. Most of the students in China benefit from the new educational _(体制). 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 _(轻柔地). 6. Nothing can _(阻止) him doing research into the issue of water pollution. 7. The results of the test are very _(令人振奋). 8. Health _(依赖于) 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 _(启迪) the mind of students. 请根据语义写出短语1. _ system 太阳系2. _ time 及时，最终 3. _ birth to 生(孩子) 4. _ from 阻止5. _ out 阻挠6. _ up 喝彩雀跃7. _ that 既然8. _ out 迸发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.根据语境猜词义(1) Fruit juices can be harmful to childrens teeth. (2) Many households products are potentially harmful. 根据语义找匹配有害的B. 危害 (1) A(2) B harmful adj.链接链接harm n. 损伤；损伤； 损害损害 vt. 损伤损伤； 损害损害 harmless adj. 无害的；无害的； 无恶意的无恶意的 短语短语do sb. harm do harm to sb. 对某人有害对某人有害be harmful to 对对有

11、害有害 harmful adj.句型句型 It does no harm to do sth. /There is no harm (in) doing sth. 无妨做某事无妨做某事 It wouldnt do sb. any harm to do sth. 做某做某事对某人并无害处事对某人并无害处 No harm done! (对他人做错事的一种劝慰对他人做错事的一种劝慰) 没事儿！没事儿！ 不要紧！不要紧！ harmful adj. 单词拼写(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.根据语境猜词义(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.根据语义找匹配A. 妨碍 B. 阻止 (1) B(2) A

13、 prevent v.链接链接“阻止某人做某事的几种表达式：阻止某人做某事的几种表达式：ban sb. from doing sth.stop sb. (from) doing sth.keep sb. from doing sth. prevent v. 单项填空()(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调查非谓语动词的运用。此题的语义是： 为了使我们的生活更

14、加愉快，我们必需采取果断而卓有效果的措施阻止污染。根据语境非谓语动词在本句是目的状语，所以答案是A。此题极容易呵斥学生们的思想定势而误选B。 prevent v.()(2) Well spare no effort to prevent the river _. A. from polluting B. polluting C. being polluted D. polluted C调查非谓语动词的运用。此题的语义是：我们将不遗余力地阻止河流污染。根据语境河流与污染构成了被动关系，所以答案是C。 prevent v.develop v.根据语境猜词义(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. 根据语义找匹配A. 养成(习惯) B. 开展C. 开发 (1) A(2) B(3) C develop v.链接链接developed adj. 兴隆的兴隆的 devel

16、oping adj. 开展中的开展中的 development n. 开展开展 develop v. 用develop的正确方式填空 With the _ of science and technology, some _ countries have developed into _ ones.development; developing; developeddevelop v. puzzle n&v.根据语境猜词义(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根据语义找匹配使迷惑不解B. 谜C. 难题D. 使为难 puzzle n&v.链接链接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 对对大惑不解大惑不解work out a

18、puzzle 猜谜；处理难题猜谜；处理难题puzzle over 对对冥思苦想冥思苦想puzzle out (苦苦思索而苦苦思索而)搞清楚搞清楚puzzle ones brain about / over 对对而大伤脑筋而大伤脑筋 puzzle n&v. 用puzzle的正确方式填空 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.根据语境猜词义(1) Mothers are always gentle with their children. (2) Its very comfortable to let the gentle wind blow on your face. 根据语义找匹配悄然的，轻柔的 B. 温顺的，文雅的 (1) B(2) A gentle adj.链接链接gentlelooking adj. 看起来彬彬有礼的、看起来很看起来彬彬有礼的、看起来很绅士的绅士的gentleman n. 绅士，先生绅士，先生gently adv. 温顺地，轻柔地，悄然地温顺地，轻柔地，悄然地 gentleness n. 温顺，和蔼温顺，和蔼短语短语be gentle with sb. 对某人体恤入微，对某人温顺有加对某人体恤入微，对某人温顺有加gentle in voice / action 声音温顺，举止文雅声音温顺，举止文雅have a gentle manner of doing sth. 做某事风度高雅做某事风度高雅 gentle adj.辨析