The (29) similarly of liquids and gases becomes clearly apparent when the temperature and pressure are raised somewhat. (30) a closed container partially filled with a liquid is heate
D. The li quid expands or (31), becomes less dense; some of it evaporates. (32), the vapor above the liquid surface becomes dense r as the evaporated molecules are added to it. The combination of temperature and pressure (33) the densities become equal is (34) the critical point. Above the critical point the liquid and the gas can no longer be (35); there is a single, undifferentiated fluid phase of uniform density.
21. A. in
B. on
C. under
D. beyond
22. A. fills
B. be filled
C. filling
D. to fill
23. A. intends
B. tends
C. inclines
D. contends
24. A. however
B. nevertheless
C. so
D. therefore
25. A. in the event of
B. in the case of
C. with a view to
D. with reference to
26. A. having described
B. described
C. describing
D. to have described
27. A. made up of
B. consisted of
C. constituted of
D. made from
28. A. apply
B. adapt
C. take
D. conduct
29. A. elementary
B. crucial
C. rudimentary
D. fundamental
30. A. Suppose
B. To suppose
C. Being supposed
D. Supposed
31. A. in a word
B. in the meantime
C. in other words
D. in that case
32. A. Similarly
B. In contrast
C. Furthermore
D. Instead
33. A. on that
B. on which
C. at that
D. at which
34. A. known
B. defined
C. called
D. referred to
35. A. classified
B. recognized
C. categorized
D. distinguished |
