大学英语四级阅读精选模拟题100篇及答案详解(75)
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
答案:11. I 12. B 13. C 14. D 15. O 16. K 17. N 18. F 19. A 20. E
猜你喜欢
-
- 03-082017考研新大纲的阅读理解定位原则
- 03-082017考研英语一写作PartA大纲详解
- 03-082017年考研英语大纲继续保持连续性和稳定性
- 03-082017英语大纲之备考新题型考查形式分析
- 03-082017年考研英语一、二阅读理解360度解读
- 03-082017考研英语一大纲:各模块考查变化详述
- 03-082017考研英语一新题型:题目相对成熟无增减
- 03-082017考研英语二英译汉:分值依旧占到15%
- 03-082017年考研(英语一)考试大纲不变
- 03-082017考研英语大纲解析--阅读PartB详解