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
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2014届高三英语一轮单元复习训练：Module 5 Great People and Great Inventions of Ancient China（外研版必修3）
2014届高三英语一轮单元复习训练：Module 4 Which English（外研版选修8）
2014届高三英语一轮单元复习训练：Module 3 Body Language and Non-verbal Communication（外研版必修4）
2014届高三英语一轮单元复习训练：Module 4 Music Born in America（外研版选修7）
2014届高三英语一轮单元复习训练：Module 6 Films and TV Programmes（外研版必修2）
2014届高三英语一轮单元复习训练：Module 6 Animals in Danger（外研版必修5）
2014届高三英语一轮单元复习训练：Module 4 Carnival（外研版必修5）
2014届高三英语一轮单元复习训练：Module 3 Interpersonal Relationship—Friendship（外研版选修6）
2014届高三英语一轮单元复习训练：Module 2 The Renaissance（外研版选修8）
2014届高三英语一轮单元复习训练：Modules 4～6综合技能测试（外研版必修2）
2014届高三英语一轮单元复习训练：Module 3 Literature（外研版选修7）
2014届高三英语一轮单元复习训练：Module 1 Our Body and Healthy Habits（外研版必修2）
2014届高三英语一轮单元复习训练：Module 3 The Violence of Nature（外研版必修3）
2014届高三英语一轮单元复习训练：Modules 4～6综合技能测试（外研版必修5）
2014届高三英语一轮单元复习训练：Modules 4～6综合技能测试（外研版必修1）
2014届高三英语一轮单元复习训练：Module 1 Basketball（外研版选修7）
2014届高三英语一轮单元复习训练：Module 3 Foreign Food（外研版选修8）
2014届高三英语一轮单元复习训练：Module 2 Highlights of My Senior Year（外研版选修7）
2014届高三英语一轮单元复习训练：Module 4 Music（外研版选修6）
2014届高三英语一轮单元复习训练：Module 5 Ethnic Culture（外研版选修7）
2014届高三英语一轮单元复习训练：Modules 1～3综合技能测试（外研版必修5）
2014届高三英语一轮单元复习训练：Module 5 A Lesson in a Lab外研版必修1
2014届高三英语一轮单元复习训练：Modules 1～3综合技能测试（外研版必修1）
2014届高三英语一轮单元复习训练：Module 6 The World‘s Cultural Heritage（外研版选修7）
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2014届高三英语一轮单元复习训练：Module 3 My First Ride on a Train外研版必修1
江西省信丰中学高三英语复习：英语试题
2014届高三英语一轮单元复习训练：Modules 1～3综合技能测试（外研版必修2）
2014届高三英语一轮单元复习训练：Module 2 Fantasy Literature—Philip Pullman（外研版选修6）
2014届高三英语一轮单元复习训练：Module 1 British and American English（外研版必修5）