SDcamps•演辩营全国英语演讲与辩论赛
Oil Refining An important new industry, oil refining, grew after the Civil war. Crude oil, or petroleum – a dark, thick ooze from the earth – had been known for hundreds of years, but little use had ever been made of it. In the 1850’s Samuel M. Kier, a manufacturer in western Pennsylvania, began collecting the oil from local seepages and refining it into ke...
Raising Oysters In the oysters were raised in much the same way as dirt farmers raised tomatoes- by transplanting them. First, farmers selected the oyster bed, cleared the bottom of old shells and other debris, then scattered clean shells about. Next, they “planted” fertilized oyster eggs, which within two or three weeks hatched into larvae. The larvae drifted un...
Plate Tectonics and Sea-floor Spreading The theory of plate tectonics describes the motions of the lithosphere, the comparatively rigid outer layer of the Earth that includes all the crust and part of the underlying mantle. The lithosphere(n.[地]岩石圈)is divided into a few dozen plates of various sizes and shapes, in general the plates are in motion with respect to one anot...
Plankton浮游生物. Scattered through the seas of the world are billions of tons of small plants and animals called plankton. Most of these plants and animals are too small for the human eye to see. They drift about lazily with the currents, providing a basic food for many larger animals. Plankton has been described as the equivalent of the grasses that grow on the dry land co...
新概念优美背诵短文50篇 Unit8:American Revolution The American Revolution was not a sudden and violent overturning of the political and social framework, such as later occurred in France and Russia, when both were already independent nations. Significant changes were ushered in, but they were not breathtaking. What happened was accelerated evolution rather than outright revol...
Life doesn’t always give us the joys we want.生活并非总是如你所愿。We don’t always get our hopes and dreams, and we don’t always get our own way.希望有时会落空，梦想有时会破灭，我们不能一切随心所愿。But don’t give up hope, because you can make a difference one situation and one person at a time.但别放弃希望，因为事物并非一成不变；不同时间，不同场合，...
新概念优美背诵短文50篇 Unit16:The War between Britain and France 16. the war between Britain and France In the late eighteenth century, battles raged in almost every corner of Europe, as well as in the Middle East, south Africa ,the West Indies, and Latin America. In reality, however, there was only one major war during this time, the war between Britain and France. All othe...
03 The Definition of “Price” Prices determine how resources are to be used. They are also the means by which products and services that are in limited supply are rationed among buyers. The price system of the United States is a complex network composed of the prices of all the products bought and sold in the economy as well as those of a myriad of services, inclu...
新概念优美背诵短文50篇 Unit10:Types of Speech Standard usage includes those words and expressions understood, used, and accepted by a majority of the speakers of a language in any situation regardless of the level of formality. As such, these words and expressions are well defined and listed in standard dictionaries. Colloquialisms, on the other hand, are familiar words and ...
新概念优美背诵短文50篇 Unit7:Andrew Carnegie Andrew Carnegie, known as the King of Steel, built the steel industry in the United States, and , in the process, became one of the wealthiest men in America. His success resulted in part from his ability to sell the product and in part from his policy of expanding during periods of economic decline, when most of his competitors w...
05 The Beginning of Drama There are many theories about the beginning of drama in ancient Greece. The on most widely accepted today is based on the assumption that drama evolved from ritual. The argument for this view goes as follows. In the beginning, human beings viewed the natural forces of the world-even the seasonal changes-as unpredictable, and they sought through vari...
新概念优美背诵短文50篇 Unit14:A Rare Fossil Record 14 A Rare Fossil Record The preservation of embryos and juveniles is a rate occurrence in the fossil record. The tiny, delicate skeletons are usually scattered by scavengers or destroyed by weathering before they can be fossilized. Ichthyosaurs had a higher chance of being preserved than did terrestrial creatures because, as...
新概念优美背诵短文50篇 Unit11:Archaeology Archaeology Archaeology is a source of history, not just a bumble auxiliary discipline. Archaeological data are historical documents in their own right, not mere illustrations to written texts, Just as much as any other historian, an archaeologist studies and tries to reconstitute the process that has created the human world in whic...
Dufficulties arise in the lives of us all.生活中困难在所难免，What is most important is dealing with the hard times, coping with the changes, and getting through to the other side where the sun is still shining just for you.最重要的是要挺过艰难的时刻，积极应对种种变故，冲破黎明前的黑暗，你终会看到只属于自己的灿烂阳光。It takes a strong person to deal with tough times and dif...
A Grain of Sand 一粒沙子 William Blake/威廉.布莱克 To see a world in a grain of sand, And a heaven in a wild fllower, Hold infinity in the palm of your hand, And eternity in an hour. 从一粒沙子看到一个世界， 从一朵野花看到一个天堂， 把握在你手心里的就是无限， 永恒也就消融于一个时辰。 NSDA“SDcamps”全国英语演讲与辩论大赛（大学组）/SDcamps全国中小学生英语演讲与辩论大会（中小...
新概念优美背诵短文50篇 Unit12:Museums 12 Museums From Boston to Los Angeles, from New York City to Chicago to Dallas, museums are either planning, building, or wrapping up wholesale expansion programs. These programs already have radically altered facades and floor plans or are expected to do so in the not-too-distant future. In New York City alone, six major institutions ha...
新概念优美背诵短文50篇 Unit15:The Nobel Academy 15 The Nobel Academy For the last 82years, Sweden's Nobel Academy has decided who will receive the Nobel Prize in Literature, thereby determining who will be elevated from the great and the near great to the immortal. But today the Academy is coming under heavy criticism both from the without and from within. Critics conten...
A Forever Friend 永远的朋友 “A friend walk in when the rest of the world walks out.” “别人都走开的时候，朋友仍与你在一起。” Sometimes in life, 有时候在生活中， You find a special friend; 你会找到一个特别的朋友; Someone who changes your life just by being part of it. 他只是你生活中的一部分内容，却能改变你整个的生活。 Someone who makes you laugh until you can...
新概念优美背诵短文50篇 Unit6:Television Television—–the most pervasive and persuasive of modern technologies, marked by rapid change and growth-is moving into a new era, an era of extraordinary sophistication and versatility, which promises to reshape our lives and our world. It is an electronic revolution of sorts, made possible by the marriage of television and...
A Greek to Remember 一位值得纪念的希腊人 Diogenes was a famous Greek philosopher of the fourth century B.C.,who established the philosophy of cynicism.He often walked about in the daytime holding a lighted lantern,peering around as if he were looking for something.When auestioned about his odd behavior,he would reply,”I am searching for an honest man.” Diogenes h...