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這篇經(jīng)典文章已有數(shù)百年的歷史，至今讀來(lái)仍覺(jué)有益。 Jessie老師英語(yǔ)美文朗讀，一遍慢速，適合模仿，一遍快速，適合練語(yǔ)速和聽(tīng)力！純正美音，適合模仿學(xué)習(xí)。 Why Did Dinosaurs Suddenly Die Out? The most intriguing question about dinosaurs has always been "why did they die out?" There is no simple answer to this question, even though many hundreds of scientists are studying the problem. They are not studying the extinction of the dinosaurs alone, but the whole question of extinction. Many other plants and animals have died out in the past, and it is important to understand how and why this happened. Having this information could help save many species that are under threat in the modern world. Humans are causing extinctions now, because of pollution and other damage to the environment. Maybe the dinosaurs can tell us how to save the earth today, because of their extinction 65 million years ago! Some of the early dinosaur scientists, 100 years ago, thought the dinosaurs died out because the air changed, and they could not breathe. Others thought that the dinosaurs disappeared simply because they became too big. They were too heavy to move without falling over, and could not find enough food to survive. One theory is that a huge killer meteorite hit the earth. Some scientists hold that the extinction of dinosaurs was possibly due to a rapid cooling of the planet's climate. Perhaps huge amounts of lava poured out of volcanoes in India. This sent up vast clouds of dust that blacked out the sun, and made the earth icy cold. 關(guān)于恐龍的最令人感興趣的問(wèn)題總是“它們?yōu)槭裁磿?huì)滅絕？”即使有數(shù)百位科學(xué)家正在研究這個(gè)問(wèn)題，這個(gè)問(wèn)題仍然沒(méi)有簡(jiǎn)單的答案。他們并不只是研究恐龍的滅絕，而是研究整個(gè)滅絕的問(wèn)題。過(guò)去有很多中其他種類的動(dòng)植物滅絕了，了解如何發(fā)生和為何發(fā)生這種情況很重要。獲得這種信息能夠挽救許多在當(dāng)今社會(huì)正在面臨滅絕威脅的物種。由于污染和對(duì)環(huán)境的其他損害，人類現(xiàn)在正在導(dǎo)致物種滅絕?？铸?jiān)?/span>6500萬(wàn)年前的滅絕或許能夠告訴我們?nèi)绾瓮炀冉裉斓牡厍颍?/span>100年，一些早期恐龍學(xué)家認(rèn)為恐龍的滅絕是因?yàn)榭諝獾淖兓瘜?dǎo)致它們無(wú)法呼吸。另一些人認(rèn)為恐龍的滅絕僅僅是因?yàn)樗鼈兲^(guò)龐大，它們太過(guò)笨重?zé)o法行走而不摔倒，無(wú)法找到足夠的食物以維持生存。還有一個(gè)理論是一個(gè)巨大的殺手——隕石撞擊了地球。一些科學(xué)家認(rèn)為恐龍的滅絕可能是由于地球氣候的迅速變冷所致?；蛟S印度火山噴涌出了大量火山巖，使得大量的煙塵遮住了太陽(yáng)，從而使地球變得冰冷。
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