大學英語六級閱讀理解練習

　　閱讀理解題，有議論文、記敘文、說明文、應用文、對話等等，涉及社會教育、風俗文化、史地知識、科技、政治、經濟、日常生活、傳記、人物等諸多方面。這種試題題型一般包括一些信息題、是非題和推理、演算題等等。小編整理了相關的內容，歡迎欣賞與借鑒。

　　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

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

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