2015年12月的英语四六级考试已经结束，要是你感觉自己不能通关，就抓紧准备2016年6月份的考试。英语六级考试中阅读所占比重为百分之三十五，阅读的重要性不言而喻。想要早点做准备就来看看文都网校整理的六级阅读练习题吧。

　　Growth of trade will depend greatly on availability of energy sources. There may still be a trillion barrels of recoverable oil in the Middle East. But the oil crisis of 1974 has 11 to renewed interest in coal and to a search for 12 sources of energy. Solar, geothermal, and nuclear energy will play a large role in the years to come.

　　Solar energy is available in 13 forms. Buildings can be heated and cooled by direct use of solar radiation, crops and trees, which are the most efficient converters of sunlight into energy, can be grown for their energy potential, wastes can be burned as 14 , sunlight can be converted into DC (direct current) electricity, electric power can be 15 from the sun-warmed surface waters of the ocean, and lastly, solar radiation can be converted into heat that will drive electric power generators. Serious problems still remain as to 16 and storage of solar energy.

　　Geothermal energy is the energy contained within the earth. Heat is abundantly available deep in the earth's core and is constantly being produced. However, this heat is usually located at too deep a level for 17 exploitation. In short, very little is known on the use of geothermal energy, and it has 18 been exploited.

　　Nuclear energy is produced in nuclear power plants. At these plants atoms of uranium are split, thus 19 masses of energy. Another source of energy

　　under development is the nuclear fusion of certain atoms of hydrogen. This could eventually 20 natural gas as a source of energy.

　　A. rarely

　　B. transformation

　　C. fuel

　　D. replace

　　E. led

　　F. alternative

　　G. commercial

　　H. briefly

　　I. derived

　　J. various

　　K. relieving

　　L. releasing

　　M. transportation

　　N. financial

　　O. described

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

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