SDcamps•演辩营全国英语演讲与辩论赛
Cells and Temperature Cells cannot remain alive outside certain limits of temperature and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only within a narrow range around 37C;a departure of a few degrees from this value seriously impairs their functioning. Even though cells can survive wider fl...
The Salinity of Ocean Waters If the salinity of ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation— conversion of liquid water to w...
The Origin of Sports When did sport begin? If sport is, in essence, play, the claim might be made that sport is much older than humankind, for , as we all have observed, the beasts play. Dogs and cats wrestle and play ball games. Fishes and birds dance. The apes have simple, pleasurable games. Frolicking infants, school children playing tag, and adult arm wrestlers ar...
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 idioms that are understood by ...
Movie Music Accustomed though we are to speaking of the films made before 1927 as “silent”, the film has never been, in the full sense of the word, silent. From the very beginning, music was regarded as an indispensable accompaniment; when the Lumiere films were shown at the first public film exhibition in the United States in February 1896, they were accompanied...
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 various...
44.Obtaining Fresh water from icebergs The concept of obtaining fresh water from icebergs that are towed to populated areas and arid regions of the world was once treated as a joke more appropriate to cartoons than real life. But now it is being considered quite seriously by many nations, especially since scientists have warned that the human race will outgrow its fresh wate...
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...
Evolution of sleep Sleep is very ancient. In the electroencephalographic sense we share it with all the primates and almost all the other mammals and birds: it may extend back as far as the reptiles. There is some evidence that the two types of sleep, dreaming and dreamless, depend on the life-style of the animal, and that predators are statistically much more likely to dre...
英语精美散文欣赏:After A Long Winter 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（中小学及幼儿组）/美式辩论赛（以下简称大赛/大会）现诚招全国省市合作伙伴或城市合伙人，共同进行推广NSDA赛事品牌、举办赛事及培训活动、开展素质教育、美式营地项目等多方面合作。 我们希望认同NSDA理念，有赛事组织经验，或有教育资源，特别是有理想有热情的机构或个人...
Love 爱情 I love you not because of who you are,but because of who I am when I am with you. 我爱你，不是因为你是一个怎样的人，而是因为我喜欢与你在一起时的感觉。 No man or woman is worth your tears,and the one who is ,won’t make you cry. 没有人值得你流泪，值得让你这么做的人不会让你哭泣。 The worst way to miss someone is to be sitting right beside them knowing you can...
相关专题: 精美英文欣赏 美丽英文诵读 To respect my work, my associates and myself. To be honest and fair with them as I expect them to be honest and fair with me. To be a man whose word carries weight. To be a 1) booster, not a 2) knocker; a pusher, not a kicker; a motor, not a 3) clog. To base my expectations of reward on a solid foundation of service rendered; to be willing...
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...
相关专题: 精美英文欣赏 美丽英文诵读 At a young and tender age, Patti Wilson was told by her doctor that she was an epileptic. Her father, Jim Wilson, is a morning jogger. One day she smiled through her braces and said, “Daddy what I’d really love to do is run with you every day, but I’m afraid I’ll have a seizure.” Her father told her, “If...
General Douglas MacArthur: Farewell Address to Congress Mr. President, Mr. Speaker, and Distinguished Members of the Congress: I stand on this rostrum with a sense of deep humility and great pride — humility in the weight of those great American architects of our history who have stood here before me; pride in the reflection that this home of legislative debate represe...
Moderator: Ladies and Gentlemen: The President of the United States, Ronald Reagan. President Reagan: Thank you. Thank you very much. Thank you very much. Thank you very much. Thank you very much. And, Reverend Clergy all, Senator Hawkins, distinguished members of the Florida congressional delegation, and all of you: I can’t tell you how you have warmed my heart with ...
John F. Kennedy: “Ich bin ein Berliner” (“I am a ‘Berliner'”) I am proud to come to this city as the guest of your distinguished Mayor, who has symbolized throughout the world the fighting spirit of West Berlin. And I am proud — And I am proud to visit the Federal Republic with your distinguished Chancellor who for so many years has commi...
John F. Kennedy: Inaugural Address [Administering of the Oath of Office] Vice President Johnson, Mr. Speaker, Mr. Chief Justice, President Eisenhower, Vice President Nixon, President Truman, Reverend Clergy, fellow citizens: We observe today not a victory of party, but a celebration of freedom — symbolizing an end, as well as a beginning — signifying renewal, as...
Malcolm X: “The Ballot or the Bullet” (Photo not taken on this occasion) Mr. Moderator, Reverend Cleage, Brother Lomax, brothers and sisters, and friends and I see some enemies. In fact, I think we’d be fooling ourselves if we had an audience this large and didn’t realize that there were some enemies present. This afternoon we want to talk about the ballot or th...
President Anderson, members of the faculty, board of trustees, distinguished guests, my old colleague, Senator Bob Byrd, who has earned his degree through many years of attending night law school, while I am earning mine in the next 30 minutes, distinguished guests, ladies and gentlemen: It is with great pride that I participate in this ceremony of the American University, s...