There was one thought that air pollution affected only the area immediately around large cities with factories and heavy automobile traffic. At present, we realize that although these are the areas with the worst air pollution, the problem is literally worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the east of the United States and brought health warnings in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be infected by air pollution. Some scientists consider that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels (coal and oil) is creating a “greenhouse effect”— conserving heat reflected from the earth and raising the world’s average temperature. If this view is correct and the world’s temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be in water.

Another view, less widely held, is that increasing particular matter in the atmosphere is blocking sunlight and lowering the earth’s temperature — a result that would be equally disastrous. A drop of just a few degrees could create something close to a new ice age, and would make agriculture difficult or impossible in many of our top farming areas. Today we do not know for sure that either of these conditions will happen (though one recent government report drafted by experts in the field concluded that the greenhouse effect is very possible). Perhaps, if we are lucky enough, the two tendencies will offset each other and the world’s temperature will stay about the same as it is now. Driven by economic profits, people neglect the damage on our environment caused by the “advanced civilization”. Maybe the air pollution is the price the human beings have to pay for their development. But is it really worthwhile?

46. As pointed out at the beginning of the passage, people used to think that air pollution _______.

　A. cause widespread damage in the countryside

　B. affected the entire eastern half of the United States

　C. had damaged effect on health

　D. existed merely in urban and industries areas

47. As to the greenhouse effect, the author __________.

　A. share the same view with the scientist.

　B. is uncertain of its occurrence

　C. rejects it as being ungrounded

　D. thinks that it will destroy the world soon

48. The word “offset” in the second paragraph could be replaced by _________.

　A. slip into   B. make up for　　 C. set up    D. catch up with

49. It can be concluded that ____________.

　A. raising the world’s temperature only a few degrees would not do much harm to life on earth

　B. lowering the world’s temperature merely a few degrees would lead major farming areas to disaster 

　C. almost no temperature variations have occurred over the past decade

　D. the world’s temperature will remain constant in the years to come

50. This passage is primarily about __________.

　A. the greenhouse effect        　    B. the burning of fossil fuels

　C. the potential effect of air pollution  　D. the likelihood of a new ice age

　　During the fourth China Beijing High-tech（技术的）Industries Week, exhibitions, feature presentations, technological exchanges and trade talks, and other events are organized.

　　Exhibitions

　　●China International Exhibition Center

　　* Section for China’s key science and technology achievements of the Ninth Five-Year Plan （1996 -2000）

　　* Environmental protection and energy section

　　* Section for exhibitors from other provinces and municipalities（自治县）and regions of China

　　●China World Trade Center

　　* Exchange and Trade Fair（博览会）for Science and Technology Books and Sports Information Media

　　* The Trade Fair for Modern Intelligent Houses and Beijing Urban（城市的 ）Real Estate（不动产）

　　●China Millennium（一千年）Monument

　　* Forum（论坛）and Exhibition of Foreign Sci-tech Universities

　　●China Agricultural Culture Center

　　* High-tech Construction Products Exhibition Feature Presentation

　　●Science and Education

　　* Scientists Forum on the New Century

　　●High-tech Industry

　　* Forum on Environmental Protection

　　* 2001 Forum on Bio-technology on Traditional（传统的）Chinese Medicine and Natural Medicine

　　Technical Exchanges and Trade Talks

　　●Trade talks on financial（金融的）

　　capital（资金）transformation

　　●Sino-Italian Forum and Trade Fair for the Development of IT and Communications Technology

　　1．If you want to know more about the high-tech achievements of different parts of China, you should go to ________.

　　A．China World Trade Center

　　B．China Millennium Monument

　　C．China International Exhibition Center

　　D．China Agricultural Cultural Center

　　2．These sessions mark the achievements of mankind in the fields of ________.

　　A．electronic communications, energy and education

　　B．sports technology, film-industry and environmental protection

　　C．network technology, high-tech industries and traffic

　　D．medicine, weather broadcast and finance

　　3．The advertisement is mainly about ________.

　　A．the major activities of the high-tech week

　　B．the time-table of high-tech week

　　C．the names of the meeting places

　　D．the topic of trade talks

The United States is well?known for its network of major highways designed to help a driver get from one place to another in the shortest possible time.?　36　? these wide modern roads are generally ?　37　? and well maintained, with ?　38　? sharp curves and many straight ?　39　?,a direct route is not always the most ?　40　? one. Large highways often pass ?　41　? scenic areas and interesting small towns. Furthermore, these highways generally ?　42　? large urban centers which means that they become crowded with ?　43　? traffic during rush hours,?　44　? the “fast, direct” way becomes a very slow route. However, there is ?　45　? always another route to take ?　46　? you are not in a hurry. Not far from the ?　47　? new “superhighways”,there are often older,?　48　? heavily traveled roads which go through the countryside.?　49　? of these are good two lane roads; others are uneven roads ?　50　? through the country. These secondary routes may go up steep slopes, along hilly ?　51　? or down frightening hillsides to towns ?　52　? in deep valleys. Though these are less direct routes, longer and slower, they generally go to places ?　53　? the air is clear and the scenery is beautiful, and the driver may have a ?　54　? to get a fresh, clean ?　55　? of the world.

36. A. Although     B. Since  C. Because      D. Therefore

37. A. rough   B. splendid     C. smooth       D. complicated

38. A. little     B. few     C. much  D. many

39. A. selections     B. separations C. divisions    D. sections

40. A. terrible B. Possible     C. enjoyable   D. reasonable

41. A. to B. Into    C. over    D. by

42. A. lead     B. connect      C. collect D. provide

43. A. large    B. fast     C. light   D. heavy

44. A. when    B. for      C. but     D. that

45. A. yet       B. still     C. almost D. quite

46. A. unless   B. if C. as       D. since

47. A. relatively     B. regularly    C. reasonably  D. respectively

48. A. and      B. Less    C. more   D. or

49. A. All       B. Several      C. Lots    D. Some

50. A. driving B. crossing     C. curving      D. traveling

51. A. rocks    B. cliffs   C. roads  D. paths

52. A. lying    B. laying C. laid     D. lied

53. A. there    B. when  C. which D. where

54. A. space    B. period C. chance       D. spot

55. A. view    B. variety       C. visit    D. Virtue

The United States is well?known for its network of major highways designed to help a driver get from one place to another in the shortest possible time.?　36　? these wide modern roads are generally ?　37　? and well maintained, with ?　38　? sharp curves and many straight ?　39　?,a direct route is not always the most ?　40　? one. Large highways often pass ?　41　? scenic areas and interesting small towns. Furthermore, these highways generally ?　42　? large urban centers which means that they become crowded with ?　43　? traffic during rush hours,?　44　? the “fast, direct” way becomes a very slow route. However, there is ?　45　? always another route to take ?　46　? you are not in a hurry. Not far from the ?　47　? new “superhighways”,there are often older,?　48　? heavily traveled roads which go through the countryside.?　49　? of these are good two lane roads; others are uneven roads ?　50　? through the country. These secondary routes may go up steep slopes, along hilly ?　51　? or down frightening hillsides to towns ?　52　? in deep valleys. Though these are less direct routes, longer and slower, they generally go to places ?　53　? the air is clear and the scenery is beautiful, and the driver may have a ?　54　? to get a fresh, clean ?　55　? of the world.

36. A. Although     B. Since  C. Because      D. Therefore

37. A. rough   B. splendid     C. smooth       D. complicated

38. A. little     B. few     C. much  D. many

39. A. selections     B. separations C. divisions    D. sections

40. A. terrible B. Possible     C. enjoyable   D. reasonable

41. A. to B. Into    C. over    D. by

42. A. lead     B. connect      C. collect D. provide

43. A. large    B. fast     C. light   D. heavy

44. A. when    B. for      C. but     D. that

45. A. yet       B. still     C. almost D. quite

46. A. unless   B. if C. as       D. since

47. A. relatively     B. regularly    C. reasonably  D. respectively

48. A. and      B. Less    C. more   D. or

49. A. All       B. Several      C. Lots    D. Some

50. A. driving B. crossing     C. curving      D. traveling

51. A. rocks    B. cliffs   C. roads  D. paths

52. A. lying    B. laying C. laid     D. lied

53. A. there    B. when  C. which D. where

54. A. space    B. period C. chance       D. spot

55. A. view    B. variety       C. visit    D. Virtue