华东政法学院考博英语试卷（三）

　　Part II cioze [15 min.](15% )

　　Decide which of the choices given below would best complete the passage if inserted in the corresponding blanks. Mark the best choice for each blank on your answer sheet.

　　The difference between a liquid and a gas is obvious (21) the conditions of temperature and pressure commonly found at the surface of the Earth. A liquid can be kept in an open container and (22) it to the level of a free surface. A gas forms no free surface but (23) to diffuse throughout the space available: it must (24) be kept in a closed container, as (25) a planet’s atmosphere. The distinction was a prominent feature of early theories (26) 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 held that the two phases are (27) different kinds o f molecules. The theories now prevailing (28) a quit e different approach by emphasizing what liquids and gases have in common. They are both forms of matter that have no permanent structure, and they both flow easily. They are fluids.

　　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

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