英语四六级考试就在周六了，相信考生都打起精神准备进行最后的冲刺了。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。为了帮助大家攻克英语六级阅读，考前最后一天时间文都网校小编整理了英语六级阅读冲刺模拟练习内容，快来练习吧!

　　The difference between a liquid and a gas is obvious under the conditions of temperature and pressure commonly found at the surface of the Earth. A liquid can be kept in an open container and fill it to the level of a free surface. A gas forms no free surface but tends to diffuse throughout the 11 available; it must therefore be kept in a closed container or held by a gravitational field, as in the 12 of a planet's atmosphere. The distinction was a 13 feature of early theories describing the phases of matter. In the nineteenth century, for example, one theory maintained that a liquid could be "dissolved" in a vapor without losing its identity, and another theory 14 that the two phases are made up of different kinds of molecules. The theories now prevailing take a quite different approach by emphasizing what liquids and gases have in 15 They are both forms of matter that have no 16 structure, and they both flow readily.

　　The fundamental similarity of liquids and gases becomes clearly apparent when the temperature and pressure are 17 somewhat. Suppose a closed container 18 filled with a liquid is heated. The liquid expands, or in other words becomes less dense; some of it evaporates. In contrast, the vapor above the liquid surface becomes denser as the evaporated molecules are 19 to it. The combination of temperature and pressure at which the densities become 20

　　is called the critical point.

　　A. added

　　B. case

　　C. prominent

　　D. held

　　E. equal

　　F. partially

　　G. example

　　H. previous

　　I. space

　　J, lifted

　　K. permanent

　　L. particularly

　　M. extended

　　N. raised

　　0. common

　　II. I 12. B 13. C 14. D 15. O 16. K 17. N 18. F 19. A 20. E

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