标签：extinction 相关文章
Tropical forests in the world The world's forests are disappearing.As much as one third of the total tree cover has been lost, since agriculture began some ten thousand years ago.The remaining forests are home to half of the world's species,thus beco
大学英语六级听力短文
后置定语在考试中是一个应用比较普遍的语法概念，通过后置定语的识别以此快速确立句子或者短语的中心，有助于我们在分析语段的过程中适时聚焦注意力，同时不少题目也会涉及到与后置
新托福写作真题解析
This period is known as the time of the Migrations. 成千上万的人是否被打死，这并不重要，而成千上万的人却随后跟上。这个时期叫民族大迁徙时期。 It was the storm that swept up the Roman empire and whirled it in
世界小史
The Island of Mauritius God first made Mauritius and from it, he created Paradise. Mark Twain 1896 Where is it? Over ten million years ago, the waters of the Indian Ocean boiled. Massive volcanoes erupted miles underneath the surface. Huge amounts of
英文杂志-Magazine
Dinosaur Death Leads to Rise of Fish 恐龙死亡导致鱼类增多 Tens of millions of years ago, an asteroid hit what is now the Yucatan Peninsula of Mexico. The event led to a global mass extinction that has been linked to the end of the dinosaurs
2015年VOA慢速英语(七)月
[00:03.32]No matter what happens, I'm really glad I got in that car with you. 不管发生什么事 我都很高兴跟你上那辆车 [00:11.80]Sam! Get to the building! Move! 山姆，快去那栋大楼 [00:13.76]- Decepticons, attack! - Hit it! 狂派
听电影学英语-变形金刚
Origin of Species and Darwin 物种起源与达尔文 Charles Darwin was the British naturalist who became famous for his theories of evolution and natural selection. Like several scientists before him, Darwin believed all the life on earth evolved o
走进剑桥大学
雅思写作环保类重点词汇 1.vivisection活体解剖 2.perform. experiments on animals在动物身上做试验 3.test animals用于实验的动物 4.be subjected to experiments被迫接受试验 5.animal rights动物权利 6.clinical research临
雅思英语
This is Scientific Americans 60 Second Science, I am Cynthia Graber, this will just take a minute~ Want to suss out the existence of a shy mammal in a tropical jungle? Just check a bloodsucking leech. Scientists estimate that about a quarter of the w
Scientific American(四)月
This is Scientific Americans 60-Second Science. Im Steve Mirsky. Got a minute？ The November 26th issue of the journal Science included a study showing that the extinction of the dinosaurs some 65 million years ago allowed puny mammals to get really
Scientific American(十一)月
The K-T boundary marks the end of the age of dinosaurs, and the beginning of the age of mammals. KT界限层标志着恐龙时代的终点和哺乳动物时代的开端。 But does the K-T boundary really signify the absolute end of all dinosaurs? 不过
侏罗纪搏击俱乐部
Only about one bone in a billion, it is thought, ever becomes fossilized. 据认为，在10亿根骨头当中，只有大约l根能变成化石。 If that is so, it means that the complete fossil legacy of all the Americans alive todaythat's 270 mill
万物简史
When a new moss is found it must be compared with all other mosses to make sure that it hasn't been recorded already. 要是发现了一种新的苔藓，就要把它和所有别的苔藓进行比较，看看是不是已经有过记录。 Then a form
万物简史
As one commentator has put it, fleeing would mean selecting a slow death over a quick one. 有一位评论家说，逃跑意味着在慢死和快死之中选择慢死。 The death toll would be very little affected by any plausible relocation effort,
万物简史
The first Anderson or Witzke learned of this setback to their careers was when they arrived at a conference in South Dakota 这对他们的事业是个挫折。安德森和威策克最初听到这个消息是在他们出席南达科他州的一次会议
万物简史
Suddenly we were at the center of things, Anderson told me, 突然之间，我们来到一大堆东西中间。安德森想起当年的情景， gleaming at the memory of it, when I met him and Witzke in their offices on a dismal, rainy morning in Ju
万物简史
He insisted that the iridium had been deposited by volcanic action, 他坚持认为，铱是由火山活动沉积的， even while conceding in a newspaper interview that he had no actual evidence of it. 即使他在一次记者采访中承认，他拿
万物简史
Earth is alone among the rocky planets in having tectonics, and why this should be is a bit of a mystery. It is not simply a matter of size or densityVenus is nearly a twin of Earth in these respects and yet has no tectonic activity. It is thoughttho
万物简史
According to a memo released by the White House last Thursday, President Barack Obama will read the following books while on vacation in Martha's Vineyard: 根据上周二白宫发布的备忘录，巴拉克奥巴马总统将会在马撒葡萄园岛度
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