四六级

　　英语六级最后一个月冲刺备考阶段已经到来，在2017年上半年英语六级备考中，英语六级阅读很重要，需要各位考生花更多的时间去练习，下面是小编给大家提供的英语六级考试阅读冲刺练习，希望能够帮到大家！

　　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

　　英语六级冲刺阶段，各位朋友一定要加油哦！文都小编提醒各位考生能在考前抓住有效时间进行复习，最后，文都网校四六级频道祝各位六级复习顺利！

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