[外语类试卷]大学英语六级模拟试卷78（无答案）.doc

1、大学英语六级模拟试卷 78（无答案）一、Part I Writing (30 minutes)1 For this part, you are allowed 30 minutes to write a composition on the topic My Viewpoint on Unemployment of College Graduates. You should write at least 150 words according to the suggestions given below in Chinese:1大学生失业已经成为严重的社会问题2大学生失业的原因3提出自己对待这

2、个现象的看法和认为的解决途径My Viewpoint on Unemployment of College Graduates二、Part II Reading Comprehension (Skimming and Scanning) (15 minutes)Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the questions attached to the passage. For questions 1-4, mark：Y (for YES) i

3、f the statement agrees with the information given in the passage;N (for NO) if the statement contradicts the information given in the passage;NG (for NOT GIVEN) if the information is not given in the passage.2 RainforestsTropical rainforests are the most diverse ecosystem(生态系统) on Earth, and also th

4、e oldest. Today, tropical rainforests cover only 6 percent of the Earths ground surface, but they are home to over half of the planets plant and animal species.What is a Rainforest?Generally speaking, a rainforest is an environment that receives high rainfall and is dominated by tall trees. A wide r

5、ange of ecosystems fall into this category, of course. But most of the time when people talk about rainforests, they mean the tropical rainforests located near the equator.These forests receive between 160 and 400 inches of rain per year. The total annual rainfall is spread pretty evenly throughout

6、the year, and the temperature rarely dips below 60 degrees Fahrenheit.This steady climate is due to the position of rainforests on the globe. Because of the orientation of the Earths axis, the Northern and Southern hemispheres each spend part of the year tilted away from the sun. Since rainforests a

7、re at the middle of the globe, located near the equator, they are not especially affected by this change. They receive nearly the same amount of sunlight, and therefore heat, all year. Consequently, the weather in these regions remains fairly constant.The consistently wet, warm weather and ample sun

8、light give plant life everything it needs to thrive. Trees have the resources to grow to tremendous heights, and they live for hundreds, even thousands, of years. These giants, which reach 60 to 150 ft in the air, form the basic structure of the rainforest. Their top branches spread wide in order to

9、 capture maximum sunlight, This creates a thick canopy(树冠) level at the top of the forest, with thinner greenery levels underneath. Some large trees grow so tall that they even tower over the canopy layer. As you go lower, down into the rainforest, you find less and less greenery. The forest floor i

10、s made up of moss, fungi, and decaying plant matter that has fallen from the upper layers. The reason for this decrease in greenery is very simple: The overabundance of plants gathering sunlight at the top of the forest blocks most sunlight from reaching the bottom of the forest, making it difficult

11、 for robust plants to thrive.The Forest for the TreesThe ample sunlight and extremely wet climate of many tropical areas encourage the growth of towering trees with wide canopies. This thick top layer of the rainforest dictates the lives of all other plants in the forest. New tree seedlings rarely s

12、urvive to make it to the top unless some older trees die, creating a “hole“ in the cane by. When this happens, all of the seedlings on the ground level compete intensely to reach the sunlight.Many plant species reach the top of the forest by climbing the tall trees. It is much easier to ascend this

13、way, because the plant doesnt have to form its own supporting structure.Some plant species, called epiphytes, grow directly on the surface of the giant trees. These plants, which include a variety of orchids and ferns, make up much of the under story, the layer of the rain forest fight below the can

14、opy. Epiphytes are close enough to the top to receive adequate light, and the runoff from the canopy layer provides all the water and nutrients(养分)they need, which is important since they dont have access to the nutrients in the ground.Stranglers and ButtressesSome epiphytes eventually develop into

15、stranglers. They grow long, thick roots that extend down the tree trunk into the ground. As they continue to grow, the roots form a sort of web structure all around the tree. At the same time, the strangler plants branches extend upward, spreading out into the canopy. Eventually, the strangler may b

16、lock so much light from above, and absorb such a high percentage of nutrients from the ground below, that the host tree dies.Competition over nutrients is almost as intense as competition for light. The excessive rainfall rapidly dissolves nutrients in the soil, making it relatively infertile except

17、 at the top layers. For this reason, rainforest tree roots grow outward to cover a wider area, rather than downward to lower levels. This makes rainforest trees somewhat unstable, since they dont have very strong anchors in the ground. Some trees compensate for this by growing natural buttresses. Th

18、ese buttresses are basically tree trunks that extend out from the side of the tree and down to the ground, giving the tree additional support.Rainforest trees are dependent on bacteria that are continually producing nutrients in the ground. Rainforest bacteria and trees have a very close, symbiotic(

19、共生的) relationship. The trees provide the bacteria with food, in the form of fallen leaves and other material, and the bacteria break this material down into the nutrients that the trees need to survive. One of the most remarkable things about rainforest plant life is its diversity. The temperate rai

20、nforests of the Pacific Northwest are mainly composed of a dozen or so tree species. A tropical rainforest, on the other hand, might have 300 distinct tree species.All Creatures, Great and SmallRainforests are home to the majority of animal species in the world. And a great number of species who now

21、 live in other environments, including humans, originally inhabited the rainforests. Researchers estimate that in a large rainforest area, there may be more than 10 million different animal species.Most of these species have adapted for life in the upper levels of the rainforest, where food is most

22、plentiful. Insects, which can easily climb or fly from tree to tree, make up the largest group (ants are the most abundant animal in the rainforest). Insect species have a highly symbiotic relationship with the plant life in a rainforest. The insects move from plant to plant, enjoying the wealth of

23、food provided there. AS they travel, the insects may pick up the plants seeds, dropping them some distance away. This helps to disperse the population of the plant species over a larger area.The numerous birds of the rainforest also play a major part in seed dispersal when they eat fruit from a plan

24、t, the seeds pass through their digestive system. By the time they excrete(排泄)the seeds, the birds may have flown many miles away from the fruit-bearing tree.There are also a large number of reptiles and mammals in the rainforest. Since the weather is so hot and humid during the day, most rainforest

25、 mammals are active only at night, dusk or dawn. The many rainforest bat species are especially well adapted for this lifestyle. Using their sonar, bats navigate easily through the mass of trees in the rainforest, feeding on insects and fruit.While most rainforest species spend their lives in the tr

26、ees, there is also a lot of life on the forest floor.Great apes, wild pigs, big cats and even elephants can all be found in rainforests. There are a number of people who live in the rainforests, as well. These tribes-which, up until recently, numbered in the thousands-are being forced out of the rai

27、nforests at an alarming rate because of deforestation.DeforestationIn the past hundred years, humans have begun destroying rainforests at an alarming rate. Today, roughly 1.5 acres of rainforest are destroyed every second. People are cutting down the rainforests in pursuit of three major resources-L

28、and for crops- Lumber for paper and other wood products- Land for livestock pasturesIn the current economy, people obviously have a need for all of these resources. But almost all experts agree that, over time, we will suffer much more from the destruction of the rainforests than we will benefit.The

29、 worlds rainforests are an extremely valuable natural resource, to be sure, but not flow their lumber or their land. They are the main cradle of life on Earth, and they hold millions of unique life forms that we have yet to discover. Destroying the rainforests is comparable to destroying an unknown

30、planetwe have no idea what were losing. If deforestation continues at its current rate, the worlds tropical rainforests will be wiped out within 40 years.2 Virtually all plant and animal species on Earth can be found in tropical rainforests.（A）Y（B） N（C） NG3 There is not much change in the weather in

31、 the tropical rainforests all the year round.（A）Y（B） N（C） NG4 The largest number of rainforests in the world are located on the African continent.（A）Y（B） N（C） NG5 Below the canopy level of a tropical rainforest grows an Overabundance of plants.（A）Y（B） N（C） NG6 New tree seedlings will not survive to

32、reach the canopy level unless7 Epiphytes, which form much of the under story of the rainforest, get all their water and nutrients from_.8 Stranglers are so called because they_ by blocking the sunlight and competing for the nutrients.9 Since rainforest bacteria and trees depend on cacti other for li

33、fe, the relationship they form is termed_.10 Plant species are dispersed over a large area with the help of_.11 As we are still ignorant of millions of unique life forms in the rainforest, deforestation can be compared to the destruction of_.Section ADirections: In this section, you will hear 8 shor

34、t conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A,

35、B, C and D, and decide which is the best answer.（A）The woman invites the man to have dinner.（B） The man wont visit the woman.（C） The man is very busy these days.（D）The mans wife is relatively free.（A）He often cuts classes to play basketball.（B） He has no chance to play basketball.（C） Hes looking for

36、 somebody to play the game with.（D）He loves playing basketball very much.（A）Hes surprised she chose that agency.（B） He wonders why shes kept her job.（C） He doesnt know when her classes started.（D）He doubts she makes much money now.（A）He should try a better and convenient way.（B） He should give up lo

37、oking for the book.（C） He should ask the librarian for help.（D）He should try the shelves downstairs.（A）Ask someone else to help the woman.（B） Ask the woman for directions.（C） Show the woman the map.（D）Show the woman where the dormitory is.（A）She is going to have some visitors tonight.（B） She does no

38、t like their former foreign teachers.（C） She is going to see her foreign teachers tonight.（D）She has already been invited to the mans house.（A）Shes never been treated by Dr. Joanna.（B） Shes been sitting in the waiting room too long.（C） Dr. Joanna isnt the very good choice.（D）Shed like to recommend a

39、 magazine to the man.（A）Spending too much money on the customers.（B） Finding no available conference room in Shangri-la.（C） Too many customers coming to attend the meeting.（D）Few customers going to see ice sculptures and buildings.（A）The data he collected.（B） Notes from research journals.（C） His res

40、earch project.（D）The climate changes in his hometown.（A）The paper should be written in proper format.（B） The student should consult his parents for information.（C） The published and unpublished data should be put in the reference.（D）The draft should be handed in soon.（A）The student will hand in the

41、final copy.（B） The student will have the professor to look at her draft.（C） The student will do a field trip.（D）The student will talk to another professor.（A）He was asked to leads group of inexperienced carets there.（B） It was the first cave that he had ever visited.（C） Clearly marked trails made it

42、 easy to explore.（D）lie hoped to make a discovery.（A）Its easy to locate（B） Its in a very windy area.（C） Its exceptionally beautiful.（D）Its partially covered by water.（A）They are more likely to damage the cave.（B） Its hard for them to stay awake.（C） They tend to break their equipment.（D）They may imag

43、ine seeing things that arent really there.（A）They are newer than the formations in most caves.（B） They were formed by sulfuric acid.（C） They have been artificially preserved.（D）They are smaller than those in any other cave.Section BDirections: In this section, you will hear 3 short passages. At the

44、end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.（A）As a religious festival.（B） For political reasons.（C） As an international competiti

45、on.（D）As a professional athletes competition.（A）Personal jealousy.（B） National pride.（C） Racial discrimination.（D）Political prejudice.（A）Athletes were murdered.（B） The Olympic Games were boycotted.（C） Athletes refused to participate the Games.（D）Athletes warned the Soviets.（A）He didnt pay enough mon

46、ey.（B） His umbrella was a present.（C） The umbrella was very good.（D）The advertisement was not well written.（A）Write a new advertisement.（B） Know the importance of an advertisement.（C） Look for the man who stole the umbrella.（D）Buy a new umbrella.（A）He will be forgiven if he confesses to stealing the

47、 umbrella.（B） He will be given a reward if he returns it.（C） He will be involved in trouble if he doesnt return it.（D）There is something wrong with the umbrella which will cause him much trouble.（A）The engine of their boat stopped working.（B） The were attacked by thunderstorm.（C） They ran out of oil

48、.（D）They ran out of food.（A）Waved their hands.（B） Shout and cried.（C） Waved their shirts.（D）Made a fire.（A）To search for the missing people.（B） To investigate a fire on one of the islands.（C） To look for the missing woman.（D）To rescue the British soldiers.（A）The residents.（B） The passers.（C） The sol

49、diers.（D）The police.Section CDirections: In this section, you will hear a passage three times. When the passage is read for the first time, you should listen carefully for its general idea. When the passage is read for the second time, you are required to fill in the blanks numbered from 36 to 43 with the exact words you have just heard. For blanks numbered from 44 to 46 you are required to fill in the missing information. For these blanks, you can either use the exact words you have jus