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
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1、,导读:据研究,6500万年前的小行星撞击地球,对地球造成了几乎是毁灭性的破坏,有人认为这可能是恐龙灭绝的原因。如果是这样,那么未来再有这样的小行星或彗星撞击地球,会不会导致人类的毁灭呢?,Its said that a huge asteroid(小行星)smashed(撞击) into the earth 65 million years ago, which certainly sent the earths ecosystem(生态系统) into a disaster which took thousands of years to recover from. Scientists
2、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 swing into the earths orbit from anywhere in the Solar System. Comets have an icy tail
3、 which reflects the sun,and 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 bodies out there which have not been discovered yet. But did an asteroid kill the dinosa
4、urs 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(灭绝)did take place around
5、 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.,请根据语义及提示写出单词 1. There is a friendly _(氛围)of helping each other with difficulties i
6、n 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 spring wind brush our faces _(轻柔地). 6. Nothing can _(阻止) him doing research into the is
7、sue 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.,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
8、) 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 阻挡 6. _ up 欢呼雀跃 7. _ that 既然 8. _ out 爆发,1. solar 2. in 3. give 4. prevent 5. block 6. cheer 7. now 8. break,1. What it was
9、 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.,根据语境猜词义 (1) Fruit juices can be harmful to childre
10、ns 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 harm n. 伤害; 损害 vt. 伤害; 损害 harmless adj. 无害的; 无恶意的 短语 do sb. harm do harm to sb. 对某人有害 be harmful to 对有害, harmful adj.,句型 It does no harm to do sth. /There is no harm (in) doing sth. 不妨做某事 I
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