2017年12月英语六级阅读练习:段落匹配题（三）
新东方网英语六级频道为大家整理了英语六级考试的阅读练习题，一起来练一下吧。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
11. I 12. B 13. C 14. D 15. O 16. K 17. N 18. F 19. A 20. E
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