我貼上來你看看 其實先不要要求自己太多 因為等一下貼出來的文章要再20分鐘內看完+回答問題 所以單字要夠多 速度要很快!
Meteorite Impact and Dinosaur Extinction
There is increasing evidence that the impacts of meteorites have had important effects on Earth, particularly in the field of biological evolution. Such impacts continue to pose a natural hazard to life on Earth. Twice in the twentieth century, large meteorite objects are known to have collided with Earth.
If an impact is large enough, it can disturb the environment of the entire Earth and cause an ecological catastrophe. The best-documented such impact took place 65 million years ago at the end of the Cretaceous period of geological history. This break in Earth’s history is marked by a mass extinction, when as many as half the species on the planet became extinct. While there are a dozen or more mass extinctions in the geological record, the Cretaceous mass extinction has always intrigued paleontologists because it marks the end of the age of the dinosaurs. For tens of millions of years, those great creatures had flourished. Then, suddenly, they disappeared.
2009-08-04 12:51:14 補充：
The body that impacted Earth at the end of the Cretaceous period was a meteorite with a mass of more than a trillion tons and a diameter of at least 10 kilometers.
2009-08-04 12:52:04 補充：
貼不完 你給我信箱好了 我發給你比較快= =
2009-08-04 12:53:48 補充：
你先看上面的 太多看不懂的就先放棄托福吧 托福字數每篇七百字左右
2009-08-08 13:05:07 補充：