移动课堂
您的位置:外语教育网 > 英语四六级 > 试题中心 > 六级试题中心 > 正文

05年6月18日六级试题(二)

2005-11-23 00:00   我要纠错 | 打印 | 收藏 | | |

 

  Part Ⅱ  Reading Comprehension

  Directions: There are 4 passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A),B),C),and D). You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the center.

  Passage One

  Questions 11 to 15 are based on the following passage.

  Low-level slash-and-burn farming doesn't harm rainforest. On the contrary, it helps farmers and improves forest soils. This is the unorthodox view of a German soil scientist who has shown that burnt clearings in the Amazon, dating back more than 1,000 years, helped create patches of rich, fertile soil that farmers still benefit from today.

  Most rainforest soils are thin and poor because they lack minerals and because the heat and heavy rainfall destroy most organic matter in the soils within four years of it reaching the forest floor. This means topsoil contains few of the ingredients needed for long-term successful farming.

  But Bruno Glaser, a soil scientist of the University of Bayreuth, has studied unexpected patches of fertile soils in the central Amazon. These soils contain lots of organic matter.

  Glaser has shown that most of this fertile organic matter comes from "black carbon"-the organic particles from camp fires and charred (烧成炭的) wood left over from thousands of years of slash-and-burn farming. "The soils, known as Terra Preta, contained up to 70times more black carbon than the surrounding soil, "says Glaser.

  Unburnt vegetation rots quickly, but black carbon persists in the soil for many centuries. Radiocarbon dating shows that the charred wood in Terra Preta soils is typically more than 1,000 years old.

  "Slash-and-burn farming can be good for soils provided it doesn't completely burn all the vegetation, and leaves behind charred wood," says Glaser. "It can be better than manure (粪肥)." Burning the forest just once can leave behind enough black carbon to keep the soil fertile for thousands of years. And rainforests easily regrow after small-scale clearing. Contrary to the conventional view that human activities damage the environment, Glaser says: "Black carbon combined with human wastes is responsible for the richness of Terra Preta soils."

  Terra Preta soils turn up in large patches all over the Amazon, where they are highly prized by farmers. All the patches fall within 500 square kilometers in the central Amazon. Glaser says the widespread presence of pottery (陶器) confirms the soil's human origins.

  The findings add weight to the theory that large areas of the Amazon have recovered so well from past periods of agricultural use that the regrowth has been mistaken by generations of biologists for "virgin" forest.

  During the past decade, researchers have discovered hundreds of large earth works deep in the jungle. They are up to 20 meters high and cover up to a square kilometer. Glaser claims that these earth works, built between AD 400 and 1400, were at the heart of urban civilizations. Now it seems the richness of the Terra Preta soils may explain how such civilizations managed to feed themselves.

  11. We learn from the passage that the traditional view of slash-and-burn farming is that        .

  A) it does no harm to the topsoil of the rainforest

  B) it destroys rainforest soils

  C) it helps improve rainforest soils

  D) it diminishes the organic matter in rainforest soils

  12. Most rainforest soils are thin and poor because       .

  A) the composition of the topsoil is rather unstable

  B) black carbon is washed away by heavy rains

  C) organic matter is quickly lost due to heat and rain

  D) long-term farming has exhausted the ingredients essential to plant growth

  13. Glaser made his discovery by        .

  A) studying patches of fertile soils in the central Amazon

  B) examining pottery left over by ancient civilizations

  C) test-burning patches of trees in the central Amazon

  D) radiocarbon-dating ingredients contained in forest soils

  14. What does Glaser say about the regrowth of rainforests?

  A) They take centuries to regrow after being burnt.

  B) They cannot recover unless the vegetation is burnt completely.

  C) Their regrowth will be hampered by human habitation.

  D) They can recover easily after slash-and-burn farming.

  15. From the passage it can be inferred that           .

  A) human activities will do grave damage to rainforests

  B) Amazon rainforest soils used to be the richest in the world

  C) farming is responsible for the destruction of the Amazon rainforests

  D) there once existed an urban civilization in the Amazon rainforests

相关资讯:
网站导航:
 学位英语 指南 动态 经验 试题 资料  托福 指南 动态 考情 留学 复习
 雅思 指南 动态 机经 经验 辅导  公共英语 指南 动态 备考 试题 辅导
 日语 指南 资讯 辅导 留学 考试  法语 发音 词汇 语法 听说 阅读
 韩语 入门 口语 阅读 留学 文化  西语 口语 词汇 阅读 留学 风采

学位英语免费试听

更多>>
  • 四级辅导
  • 六级辅导
全科套餐
280元/门
超值优惠套餐=写作+词汇+听力+阅读+翻译+真题精讲班 70课时
词汇串讲 精讲大纲词汇,轻松记忆单词
课时数:10课时
阅读串讲 紧扣大纲要求,直达阅读高分
课时数:10课时
听力串讲 剖析解题秘笈,提升听力水平
课时数:10课时
写作串讲 解读命题规律,揭秘高分技巧
课时数:10课时
翻译串讲 梳理重要考点,提高应试能力
课时数:约6课时
真题精讲 讲授历年真题,直击命题精髓
课时数:24课时

网校介绍

更多>>

外语教育网(www.for68.com)是北京东大正保科技有限公司(CDEL)旗下一家大型外语远程教育网站,正保科技成立于2005年7月,是国内超大型外语远程教育基地,上榜“北京优质教育资源榜”--“百万读者推崇的网络教育机构”。


公司凭借雄厚的师资力量、先进的网络视频多媒体课件技术、严谨细致的教学作风、灵活多样的教学方式,为学员提供完整、优化的外语课程,既打破了传统面授的诸多限制,发挥了网络教育的优势,也兼顾面授的答疑与互动特点,为我国培养了大量优秀的外语人才。


为了满足学员学习不同语种、不同阶段的学习需求,网站开设了包括考试英语、行业英语、实用口语以及小语种在内的百余门语言学习课程,涵盖英语、日语、韩语、俄语、德语、法语、西班牙语、意大利语、阿拉伯语等主要语种,供学员自由选择。此外,网站还拥有各类外语专业信息和考试信息20余万条,是广大学员了解外语类考试最新政策、动态及参加各语种培训的优质网站。


北京东大正保科技有限公司成立于2000年,是一家具备网络教育资质、经教育部批准开展远程教育的专业公司,为北京市高新技术企业、中国十大教育集团、联合国教科文组织技术与职业教育培训在中国的唯一试点项目。


公司下属13家行业远程教育网站,业务涵盖了会计、法律、医学、建设、自考、成考、考研、中小学、外语、信息技术、汉语言教学等诸多领域,拥有办公面积8000多平米,员工近千人,公司年招生规模达270万人。由于正保远程教育(China Distance Education Holdings Ltd., CDEL)在中国互联网远程教育行业内的绝对优势和强大影响力,正保教育模式一直被广大投资人所追捧。2008年7月30日,公司在美国纽约证券交易所正式挂牌上市(股票交易代码:DL),是2008年唯一一家在美国纽交所上市的专业从事互联网远程教育的中国企业。


精彩推荐

版权声明
   1、凡本网注明 “来源:外语教育网”的所有作品,版权均属外语教育网所有,未经本网授权不得转载、链接、转贴或以其他方式使用;已经本网授权的,应在授权范围内使用,且必须注明“来源:外语教育网”。违反上述声明者,本网将追究其法律责任。
  2、本网部分资料为网上搜集转载,均尽力标明作者和出处。对于本网刊载作品涉及版权等问题的,请作者与本网站联系,本网站核实确认后会尽快予以处理。
  本网转载之作品,并不意味着认同该作品的观点或真实性。如其他媒体、网站或个人转载使用,请与著作权人联系,并自负法律责任。
  3、本网站欢迎积极投稿
  4、联系方式:
编辑信箱:for68@chinaacc.com
电话:010-82319999-2371