1、大学英语六级 245及答案解析(总分：448.03，做题时间：132 分钟)一、Part I Writing (3(总题数：1，分数：30.00)1.For this part, you are allowed 30 minutes to write a letteron behalf of the Students Union and the Academic Lectures Associationto invite a visiting foreign professor, David, to deliver a presentation to the students in your
2、university. You are NOT allowed to include the name of your university in this letter. You should write at least 150 words following the outline given below. 1对这位知名的外籍教授的到来表示欢迎 2表达希望该教授就某个话题在学校进行讲座的希望和对讲座的一些基本设想 3希望教授可以接受邀请，并对教授的宝贵时间表示感谢 （分数：30.00）_二、Part II Reading C(总题数：1，分数：71.00)Physical Feature
3、s of the Country The Map The map on the adjoining page represents the portion of the North American continent which is at the present time occupied by the people of the United States. As you look upon the map imagine that you are in the air, looking down upon it as from a balloon, and take notice of
4、 what you see. On the east and on the west are the shores of two oceans. That on the east is the Atlantic. The Pacific is on the west. The Lake Country Toward the north is an immense tract of nearly level land, covered with forests, all of which are filled with water and form lakes, some large and o
5、thers small. This land, though level, is high, so that there is a very considerable though gradual descent from the lakes to the ocean. The lakes are kept constantly full by the rains and by the melting of the snows, and the surplus waters flow off in one vast channel, northward and eastward to the
6、sea. One of the large lakes, though still much higher than the sea, is marked as a low lake, for it is two or three hundred feet below the level of the others, and the water flowing from the upper lakes into it, in descending from one level to the other, passes over a high precipice (悬崖), thus produ
7、cing an immense fall, which is the celebrated Niagara (尼亚加拉大瀑布). The surplus waters of all the large lakes flow off finally in a northeasterly direction, almost exactly parallel to the coast until they reach the sea. The river thus formed is now known as the St. Lawrence. All this region of the lake
8、s is inhabited during the summer season, immense numbers of beasts run upon the land, birds fly in the air, and fishes swim in the water. In the winter, the region is buried deep in ice and snow. The birds at that season have all flown. The animals have retired to dens and holes, where some sleep, t
9、orpid (蛰伏), till the spring returns, and others digging beneath the frosty ground, gain their livelihood there by digging for roots, or gnawing (咬) the bark of trees, or catching the fish that are still swimming in the shallow waters. The Great Central Valley South of the lake country, and occupying
10、 a very large portion of the whole interior of the continent, is a broad though shallow valley, bounded both on the east and on the west by ranges of mountains. The extent of the valley is marked on the map, not only by the mountains which bound it on the east and on the west, but also by the ramifi
11、cations (支流) of the great river which drains it. These ramifications are seen spreading in every direction, like the branches of a mighty tree, and meeting in the south in one great trunk. This is the great river Mississippi, with its thousand tributaries (支流). The Soil of the Great Valley The soil
12、of the whole valley is extremely fertile. However, it is so broad and so shallow that it would have more the appearance of an extended plain than of a valley. It is what is called an alluvial (冲积的) formation; that is, a very large portion of the territory has been covered with deposits (沉淀物) from th
13、e rivers themselves, left after overflows and floods. These deposits have accumulated, in the course of ages, to a great depth, and they form an exceedingly rich and fertile soil. The rivers twist and turn this way and that in meandering (蜿蜒) through these plains. When it rains hard or snows begin t
14、o melt, huge water washes the banks, and brings down great masses of earth and great numbers of immense trees into the water. The earth thus washed in is carried down by the flood. After being mingled with a great variety of animal and vegetable remains, the earth is distributed over widely extended
15、 districts below. When the water has overflowed the banks, the soil is covered by a new layer of fertility. Formation of Islands in the River The trees float on, too, upon the current (水流，洪流). Some trees might still be dragged by their roots and get lodged along the banks or in the bed of the stream
16、. In this latter case they intercept others coming down, and so create an obstruction, around which sand and sediment (沉淀物) accumulate, until an island is formed. There is another way by which islands are formed. The river is washing continually upon its banks, and sometimes cuts through a narrow ne
17、ck. A new channel is thus made for a part of the water, while the rest flows on round the circuit in the old course. By this means an island is formed, which may, perhaps, continue for centuries to divide the stream. （分数：71.00）(1).The Pacific is on the east of the North American continent.（分数：7.10）A
18、.YB.NC.NG(2).The lakes are kept constantly full by the rains and by the melting of the snows.（分数：7.10）A.YB.NC.NG(3).No one lives in the region of the lakes.（分数：7.10）A.YB.NC.NG(4).South of the lake country is a broad though shallow valley.（分数：7.10）A.YB.NC.NG(5).Because it is broad and shallow, the Gr
19、eat Valley has more the appearance of _than of a valley.（分数：7.10）_(6).The thousands of ramifications of Mississippi finally meet in the south in one great trunk.（分数：7.10）_(7)._accumulate around the trees that get lodged along the banks or in the bed of the stream until an island is formed.（分数：7.10）_
20、(8).As you look upon the map, just imagine that you are in the air,_ it as from a balloon, and_ what you see.（分数：7.10）_(9).The surplus waters of all the large lakes flow off finally in a northeasterly direction, almost exactly parallel to the coast until they reach the sea. The river thus formed is
21、now known as_.（分数：7.10）_(10).The extent of the valley is marked on the map, not only by the mountains which bound it on the east and on the west, but also by_.（分数：7.10）_三、Listening Comprehens(总题数：1，分数：15.00)A.A new restaurant.B.A new hotel.C.A new hospital.D.A new airport.A.He read the newspaper.B.O
22、ne of his students told him.C.He listened to a radio report.D.He attended a cabinet meeting.A.Go to a fast food place with the man.B.Eat after her class.C.Join some friends for a quick meal.D.Get to her class early.A.He is sick.B.He is worried.C.He is confident.D.He is angry.A.He will owe $160.B.He
23、will owe $150.C.He will owe $110.D.He will owe $50.A.She finds reading the newspapers rarely pleasurable.B.She prefers reading the newspaper when she gets the time.C.She enjoys reading fiction but rarely get the time.D.She likes reading rare books for pleasure.A.Spanish.B.Chinese.C.Japanese.D.Arabic
24、.A.John should not talk to Bill anymore.B.John should tell Bill not to think negatively.C.John should take Bills remarks seriously.D.John should pay little attention to what Bill says.四、Section A(总题数：2，分数：10.00)A.Mating habits of squid and octopus.B.The evolution of certain form of sea life.C.The st
25、udy of marine shells.D.Survival skills of sea creatures.A.He didnt understand the lecture.B.He wants to borrow her notes next week.C.He needs help with a makeup exam.D.He was sick and unable to attend.A.Some sea creatures developed backbones.B.The first giant squid was captured.C.Some sea creatures
26、shed their shells.D.Sea life became more intelligent.A.She has always believed they exist.B.She heard about them in New Zealand.C.Stories about them may be based on giant squid.D.The instructor mentioned them in the lecture.A.A room with a single bed.B.A double room with two single beds.C.A room wit
27、h a double bed and a single bed.D.A double room and two double beds.A.Morning newspaper, continental breakfast and service.B.Morning newspaper, lunch and drinks.C.Morning newspaper, drinks and service.D.Morning newspaper, continental drinks and service.A.The nearest metro station is only three minut
28、es walk from the hotel.B.The nearest metro station is only four minutes walk from the hotel.C.The nearest metro station is only five minutes walk from the hotel.D.The nearest metro station is only three or four minutes walk from the hotel.A.The man, his wife and his daughter.B.The man and his wife.C
29、.The mans wife and his two children.D.The man, his wife and his two children.五、Section B(总题数：3，分数：30.00)A.An old custom.B.The height of chivalry.C.Medieval food.D.The way knights courted ladies.A.A long poetry of Middle Ages.B.A medieval novel.C.A medieval document.D.An old medieval romance.A.It las
30、ted until the Middle Ages.B.It lasted until the early 18th century.C.It lasted until the early 19th century.D.It lasted until the late 16th century.A.Few knights and ladies enjoyed the old custom.B.Sharing the same plate with others is considered good manner today.C.The custom is followed today in s
31、ome places.D.Customs change with time.A.Probing into the privacy of famous people.B.Short articles about less important events.C.Colorful pictures and smaller size.D.All above.A.The Daily Star.B.The Daily telegraph.C.The Times.D.The Daily Mirror.A.The Independent.B.The Daily Mirror.C.The Financial T
32、imes.D.The Daily Telegraph.A.Why people hold back their tears.B.Why people cry.C.How to restrain ones tears.D.How tears are produced.A.What chemicals tears are composed of.B.Whether crying really helps us feel better.C.Why some people tend to cry more often than others.D.How tears help people cope w
33、ith emotional problems.A.Only one out of four girls cries less often than boys.B.Of four boys, only one cries very often.C.Girls cry four times as often as boys.D.Only one out of four babies doesnt cry often.A.Only humans respond to emotions by shedding tears.B.Only humans shed tears to get rid of i
34、rritating stuff in their eyes.C.Only human tears can resist the invading bacteria.D.Only human tears can discharge certain chemicals.六、Section C(总题数：1，分数：10.00)Adults are getting smarter about how smart babies are. Not long ago, researchers learned that 4-day-olds could understand (36) 1and subtract
35、ion. Now, British research (37) 2 Graham Schafer has discovered that infants can learn words for uncommon things long before they can speak. He found that 9-month-old infants could be taught through repeated show-and-tell to(38) 3 the names of objects that were foreign to them, a result that (39) 4i
36、n some ways, the received (40) 5that apart from learning to (41) 6things common to their daily lives, children dont begin to build vocabulary until well into their second year. “ Its no (42) 7that children learn words, but the words they tend to know are words linked to (43) 8situations in the home,
37、 “ explains Schafer. “ (44) 9with an unfamiliar voice giving instructions in an unfamiliar setting. Figuring out how humans acquire language may shed light on why some children learn to read and write later than others, Schafer says, and could lead to better treatments for developmental problems. (4
38、5) 10. “ Language is a test case for human cognitive development,“ says Schafer. But parents eager to teach their infants should take note; (46) 11. “This is not about advancing development, “ he says. “Its just about what children can do at an earlier age than what educators have often thought.“ （分
39、数：10.00）填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_七、Reading Comprehensio(总题数：2，分数：177.00)Under existing law, a new drug may be labeled, promoted, and advertised only for those conditions in which safety and effectiveness have been demonstrated and which the Food an
40、d Drug Administration (FDA) has approved, or so-called approved uses. Other uses have come to be called “unapproved uses“, and cannot be legally promoted. In a real sense, the term “unapproved“ is a misnomer because it includes one phrase two categories of marketed drugs that are very different. It
41、is common for new research and new insights to identify valid new uses for drugs already on the market. Before such advances can result in new indications for inclusion in drug labeling, however, the available data must meet the legal standard of substantial evidence derived from adequate and well-c
42、ontrolled clinical trials. Such evidence may require time to develop, and, without initiative on the part of the drug firm, it may not occur at all for certain uses. However, because medical literature on new uses exists, and these uses are medically beneficial, physicians often use these drugs for
43、such purposes prior to FDA review or changes in labeling. This is referred to as “unlabeled uses“ of drugs. A different problem arises when a particular use for a drug has been examined scientifically and has been found to be ineffective or unsafe, and yet physicians who either are uninformed or who
44、 refuse to accept the available scientific evidence continue their use. Such use may have been reviewed by FDA and rejected, or, in some cases, the use may actually be warned against in the labeling. This subset of uses may be properly termed “disapproved uses“. Government policy should minimize the
45、 extent of unlabeled uses. If such uses are valid and many are - it is important that scientifically sound evidence supporting them be generated and that the regulatory system accommodates them into drug labeling. Continuing rapid advances in medical care and the complexity of drug usage, however, m
46、ake it impossible for government to keep drug labeling up to date for every conceivable situation. Thus, when a particular use of this type appears, it is also important, and in the interest of good medical care, that no label be attached to such use by practitioners while the formal evidence is ass
47、embled between the time of discovery and the time the new use is included in the labeling. In the case of disapproved uses, however, it is proper policy to warn against these in the package insert. Whether use of a drug for these purposes by the uninformed physician constitutes a violation of the cur
