2000年专四真题及答案

　　Part ⅣCLOZE [15 MIN.]

　　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 ( 26 ) the conditions of temperature and pressure commonly found at the sur face of the Earth. A liquid can be kept in an open container and ( 27 ) it to the level of a free surface. A gas forms no free surface but ( 28 ) to diffuse throughout the space available; it must ( 29 ) be kept in a closed container, as ( 30 )a planet’s atmosphere. The distinction was a prominent feature of early theories ( 31 )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 ( 32 ) different kinds o f molecules(分子). The theories now prevailing ( 33 ) 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 ea sily. They are fluids.

　　The ( 34 ) similarly of liquids and gases becomes clear ly apparent when the temperature and pressure are raised somewhat.( 35 ) a closed container partially filled with a liquid is heated. The li quid expands or ( 36 ), becomes less dense; some of it evapor ates.( 37 ), the vapor above the liquid surface becomes dense r as the evaporated molecules are added to it. The combination of temperature an d pressure ( 38 ) the densities become equal is ( 3 9 ) the critical point. Above the critical point the liquid and the gas can no longer be ( 40 ); there is a single, undifferentiated fluid phase of uniform density.

　　26. A. in B. on C. under D. beyond

　　27. A. fills B. be filled C. filling D. to fill

　　28. A. intends B. tends C. inclines D. contends

　　29. A. however B. nevertheless C. so D. therefore

　　30. A. in the event of B. in the case of C. with a view to D. with reference to

　　31. A. having described B. described C. describing D. to have described

　　32. A. made up of B. consisted of C. constituted of D. made from

　　33. A. apply B. adapt C. take D. conduct

　　34. A. elementary B. crucial C. rudimentary D. fundamental

　　35. A. Suppose B. To suppose C. Being supposed D. Supposed

　　36. A. in a word B. in the meantime C. in other words D. in that case

　　37. A. Similarly B. In contrast C. Furthermore D. Instead

　　38. A. on that B. on which C. at that D. at which

　　39. A. known B. defined C. called D. referred to

　　40. A. classified B. recognized C. categorized D. distinguished

　　Part ⅤGRAMMAR AND VOCABULARY [15 MIN.]

　　There are twenty-five sentences in this section. Beneath each sentence there are four words or phrases marked A, B, C and D. Choose one word or phrase that best completes the sentence. Mark your answers on your answer sheet.

　　41. Acute hearing helps most animals sense the approach of thunderstorm s long before people___.

　　A. do

　　B. hear

　　C. do them

　　D. hearing it

　　42. This is an illness that can result in total blindness ___ left u ntreated.

　　A. after

　　B. if

　　C. since

　　D.unless

　　43. The central provinces have floods in some years, and ___.

　　A. drought in others

　　B. droughts are others

　　C. while other droughts

　　D. others in drought

　　44. Do help yourself to some fruit,___ you?

　　A. can’t

　　B. don’t

　　C. wouldn’t

　　D. won’t

　　45. There___ nothing more for discussion, the meeting came to an e nd half an hour earlier.

　　A. to be

　　B. to have been

　　C. being

　　D. be

　　46. My mother can’t get ___ because she has rheumatism (风湿病).

　　A. about

　　B.on

　　C. through

　　D. in

　　47. I was very much put ___ by Mark’s rude behavior; it really annoyed me.

　　A.over

　　B.off

　　C.up

　　D.by

　　48. You ___ Jim anything about it. It was none of his business.

　　A. needn’t have told

　　B. needn’t tell

　　C. mustn’t have told

　　D. mustn’t tell

　　49. All of us would have enjoyed the party much more if there___ quite such a crowd of people there.

　　A. weren’t

　　B. hasn’t been

　　C. hadn’t been

　　D. wouldn’t be

　　50. Firms that use computers have found that the number of staff ___ quality control can be substantially reduced

　　A. whose

　　B.as

　　C. what

　　D. that

　　51. ___ at in this way, the present economic situation doesn’t seem so gloomy.

　　A. Looking

　　B. Looked

　　C. Having looked

　　D. To look

　　52. Many people are ___ to insect bites, and some even have to go to hospital.

　　A. insensitive

　　B. allergic

　　C. sensible

　　D. infected

　　53. When you’re driving on a motorway, you must obey the signs telling you to get into the right ___.

　　A.way

　　B.track

　　C.road

　　D.lane

　　54. The motorist had to ___to avoid knocking the old woman down in the middle of the road.

　　A. swerve

　　B. twist

　　C. depart

　　D. swing

　　55. In winter drivers have trouble stopping their cars from ___ on icy roads.

　　A. skating

　　B. skidding

　　C. sliding

　　D. slipping

　　56. This project would ___ a huge increase in defense spending.

　　A. result

　　B. assure

　　C. entail

　　D. accomplish

　　57. The chances of a repetition of these unfortunate events are ___ indeed.

　　A. distant

　　B. slim

　　C. unlikely

　　D. narrow

　　58. We should make a clear ___ between “competent” and “proficient” for the purposes of our discussion.

　　A. separation

　　B. division

　　C. distinction

　　D. difference

　　59. In the present economic ___ we can make even greater progress than previously.

　　A. air

　　B. mood

　　C. area

　　D. climate

　　60. Rite of Passage is a good novel by any standards;___, it shoul d rank high on any list of science fiction.

　　A. consistently

　　B. consequently

　　C. invariably

　　D. fortunately

　　61. The diversity of tropical plants in the region represents a seeming ly___ source of raw materials, of which only a few have been utilized.

　　A. exploited

　　B. controversial

　　C. inexhaustible

　　D. remarkable

　　62. While he was in Beijing, he spent all his time ___ some import ant museums and buildings.

　　A. visiting

　　B. traveling

　　C. watching

　　D. touring

　　63. You must let me have the annual report without ___ by ten o’cl ock tomorrow morning.

　　A. failure

　　B. hesitation

　　C. trouble

　　D. fail

　　64. As the director can’t come to the reception, I’m representing the c ompany

　　A. on his account

　　B. on his behalf

　　C. for his part

　　D. in his interest

　　65. Dreams are___ in themselves, but when combined with other data, they can tell us much about the dreamer.

　　A. uninformative

　　B. startling

　　C. harmless

　　D. uncontrollable

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