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1、Unit 5The United States of America (also referred to as the United States, the U.S., the USA, or America) is a federal constitutional republic comprising fifty states and a federal district. The country is situated mostly in central North America, where its forty-eight contiguous states and Washingt
2、on, D.C., the capital district, lie between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the south. The state of Alaska is in the northwest of the continent, with Canada to the east and Russia to the west across the Bering Strait. The state of Hawaii is an archipela
3、go in the mid-Pacific. The country also possesses several territories in the Caribbean and Pacific.At 3.79 million square miles (9.83 million km2) and with over 308 million people, the United States is the third or fourth largest country by total area, and the third largest both by land area and pop
4、ulation. It is one of the worlds most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries.6 The U.S. economy is the worlds largest national economy, with an estimated 2010 GDP of $14.799 trillion (23% of nominal global GDP and 20% of global GDP at
5、 purchasing power parity).Indigenous peoples of Asian origin have inhabited what is now the mainland United States for many thousands of years. This Native American population was greatly reduced by disease and warfare after European contact. The United States was founded by thirteen British colonie
6、s located along the Atlantic seaboard. On July 4, 1776, they issued the Declaration of Independence, which proclaimed their right to self-determination and their establishment of a cooperative union. The rebellious states defeated the British Empire in the American Revolution, the first successful c
7、olonial war of independence.8 The current United States Constitution was adopted on September 17, 1787; its ratification the following year made the states part of a single republic with a strong federal government. The Bill of Rights, comprising ten constitutional amendments guaranteeing many funda
8、mental civil rights and freedoms, was ratified in 1791.Through the 19th century, the United States displaced native tribes, acquired land from France, Spain, the United Kingdom, Mexico, and Russia, and annexed the Republic of Texas and the Republic of Hawaii. Disputes between the agrarian South and
9、industrial North over the expansion of the institution of slavery and states rights provoked the American Civil War of the 1860s. The Norths victory prevented a permanent split of the country and led to the end of legal slavery in the United States. By the 1870s, the national economy was the worlds
10、largest.9 The SpanishAmerican War and World War I confirmed the countrys status as a military power. It emerged from World War II as the first country with nuclear weapons and a permanent member of the United Nations Security Council. The end of the Cold War and the dissolution of the Soviet Union l
11、eft the United States as the sole superpower. The country accounts for 43% of global military spending and is a leading economic, political, and cultural force in the world翻译：美利坚合众国(也称美国,美国、美国,或者美国)是一种由联邦宪法共和国五十个州和一个联邦区域。这个国家是位于北美主要在中央,在这里它的48个州和华盛顿哥伦比亚特区相连,首都区,躺太平洋与大西洋之间的要道,它加拿大和墨西哥北部到南方。阿拉斯加的状态在西北
12、内陆,与加拿大和俄罗斯东向西跨越了白令海峡。夏威夷的状态是一个群岛颗氢弹。这个国家也拥有几个地区加勒比海和太平洋。占地379万平方英里(983万平方公里),超过3.08亿人,是美国第三或者第四大的国家总区、第三大无论是陆地面积和人口。它是世界上最大的种族多样化、多元文化的国家,产品的大规模移民来自许多国家。6美国经济是世界上最大的国民经济,估计有2010国民生产总值14.799万亿美元,全球GDP(23%的名义和20%的全球GDP按购买力平价)。原住民亚裔曾居住过现在的美国大陆了几千年。这个土著美国人的人口是大大降低疾病和战争经过欧洲接触。美国13个英国殖民地而成立坐落在大西洋海岸。1776年
13、7月4日发布的独立宣言,宣布他们的自决权和他们建立合作联盟。那悖逆之州击败了大英帝国在美国革命,第一个成功的殖民独立战争。目前采用美国宪法是1787年9月17日,其批准书;第二年,使美国的一个共和国的一部分,具有强大的联邦政府。权利法案,包括十个宪法修正案保证许多基本的公民权利和自由,是自1791年批准。通过19th世纪,美国原住民土地获得的流离失所来自法国、西班牙、英国、墨西哥、俄罗斯、吞并了这个共和国和中华人民共和国德州夏威夷。土地之间的争端在南部和北部的扩张工业制度的州的奴隶制度和权利藐视美国内战期间的1860年代。朝鲜的胜利永久分裂的阻止这个国家,导致最后的法律美国的奴隶制。到了187
14、0年代,国民经济是世界上规模最大的。9美国与西班牙战争和世界大战这个国家的身份确认的军事力量。它出现在第二次世界大战的第一个国家拥有核武器和一个常任理事国的联合国安理会。冷战的结束的溶解和苏联离开美国作为世界上唯一的超级强国。这个国家占全球43%的军费开支,是最主要的经济、政治和文化力量的名称,这个世界上Unit4Dear David,Im glad that youve noticed our efforts directed towards environmental protection. Thank you for your concern.As too much use of pla
15、stic bags has caused serious white pollution, our govenment encourages us to use environment-friendly shopping bags. These bags are made of a variety of material that can be easily treated when they become rubbish. Besides, they can be reused. More and more people in China have realized the advantag
16、es of such bags and started using them.I believe that the wide use of these shopping bags can greatly improve our environment. This is one of the many steps we are to make our country an even cleaner place.Yours,Li Hua我很高兴你已经注意到了我们的努力引向环保。谢谢你的关心。与过多的使用塑料袋已经造成了严重的白色污染,我们鼓励我们的政府使用环保购物袋。这些袋子是由很多种的材料,可当他们成为垃圾容易治疗。此外,他们可被重复利用。中国有越来越多的人认识到这样的优点,并开始使用它们。我相信这些购物袋的使用日益广泛,可大大提高我们的环境。这是一种多步我们要使我们的国家成为一个更清洁的地方。你的,Unit3Im Li Hua from F
