大學英語六級考試完型試題模擬訓練附答案
Time is a bird for ever on the wing.以下是小編為大家搜索整理的大學英語六級考試完型試題模擬訓練附答案,希望能給大家帶來幫助!更多精彩內容請及時關注我們應屆畢業生考試網!
Leonardo da Vinci was the first man to suggest that growing trees add a new ring in their trunks each year. The 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
參考答案11. C 12. H 13. D 14. E 15. M 16. A 17. N 18. F 19. G 20. L
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