四六级

　　阅读是被六级考生公认的拿分的关键之处，所以平时一定要多多练习，并努力的弄懂每一个选项的答案的意思，只有这样，你才会觉得做阅读题不那么吃力了。下面是小编为大家带来的一篇英语六级阅读训练题以及答案详解。

　　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

　　参考答案：

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

       希望以上内容对各位考生有帮助，想了解更多四六级备考课程、备考资讯，请点击文都网校四六级资讯站查询!

      编辑推荐