所在位置: 查字典英语网 > 大学英语 > 四级大学英语 > 四级大学英语阅读 > 四级冲刺练习阅读114

四级冲刺练习阅读114

发布时间:2016-03-01  编辑:查字典英语网小编

  11 in these rings relates to the physical conditions which the tree experiences. Thus, trees grown in a 12 area and time each develop a pattern or configuration of their rings.

  This 13 was of little significance until Andrew E. Douglas began to study tree rings in Arizona in 1900. Using a technique called cross dating, he was able to employ tree rings to the study of archaeological sites and date the ruins with 14 . Some were as old as 6700 B. C. ! This study of tree rings is called dendrochronology.

  In time the cross dating was 15 by a carbon 14 process. This approach measured the amount of carbon 14 radiating from a piece of wood and 16 to determine the age of that wood. Further use of the carbon 14 technique has shown that the radiation process is more complex and less 17 than had been at first thought.

  The most 18 aspect of tree ring research is now called dendroclimatology. This 19 of the reconstruction of climates and climatic cycles and events from the evidence found in the tree rings. From this it is hoped that a 20 of drought cycles can be determined in the American Southwest. Such information will be of great help in determining the life and ecology of that region of the United States.

  A. thus B. model C. variation D. concept

  E. accuracy F. exciting G. consists H. given

  I. proposition J. composes K. further L. pattern

  M. supplemented N. reliable O. excellent

  II. C 12. H 13. D 14. E 15. M 16. A 17. N 18. F 19. G 20. L

  

查看全部
推荐文章
猜你喜欢
附近的人在看
推荐阅读
拓展阅读

分类
  • 年级
  • 类别
  • 版本
  • 上下册
年级
不限
类别
英语教案
英语课件
英语试题
不限
版本
不限
上下册
上册
下册
不限