大学英语四六级考试模拟：英语六级模拟冲刺卷3

：月英语六级模拟冲刺卷答案3Conversation IIM: Hi, Sue. Where have you been?W: Oh. Hi, Dan. I was just at the library. I have to hand in my biology paper tomorrow.M: Tomorrow? Oh, no! I thought it wasnt due till Monday.W: Oh. Dont worry. It is due Monday. But Im going away for the weekend and wont be back till Monday night.M: Oh, where are you going?W: California. Were having a family reunion. Its my grandmothers ninetieth birthday, so all the cousins and aunts and uncles are going. She planned the whole thing herself.M: Wow. Thats great. How many people will be there?W: Around sixty. My family is big and spread up but were pretty close. So have you started working on your biology paper?M: Yeah. Im doing it on bees and how theyre able to recognize whether another bee is related to them.W: How can they tell?M: They use their sense of smell. The sweat bees guard their nest this way. If another bee approaches the nest, the guard determines if the new bee is familiar. If it is, its allowed to enter.W: Interesting. Can other insects do this? Well, the paper wasps can. Each wasp nest has a special combination of plant fibers and so the wasps that live there have a unique smell. Those two are the only kinds Ive read about so far.M: Well, youve still got time. It sounds like that the bees are picky about who comes to their family reunion.23. What is the relationship between the speakers?24. Why was the man worried at first?25. According to the man, how do some bees use their sense of smell?Section BPassage 1OK, in the last class we talked about the classification of trees and we ended up with a basic description of angiosperm. You remember that those are plants with true flowers and seeds that develop into fruits. The common broad leaf trees we have on campus fall into this category. But our pines dont. Now I hope you all followed my advice and wore comfortable shoes because as I said today we are going to do a little field study. To get started let me describe a couple of broadleaf trees we have in front of us. Im sure youve all noticed that this big tree next to Brett Hall. Its a black walnut that must be 80 feet tall. As a matter of fact there is a plaque identifying. It is the tallest black walnut in the state. And from here we can see the beautiful archway of trees at the commons. They are American elms. The ones along the commons were planted when the college was founded 0 years ago. They have distinctive dark green leaves that lock lopsided because the two sides of the leaf are unequal. I want you to notice the elm right outside the Jackson Hall. Some of the leaves have withered and turned yellow, maybe due to Dutch elm disease. Only a few branches seem affective so far but if this tree is sick itll have to be cut down. Well, lets move on and Ill describe what we see as we go.26. What are the students going to do during this class period?27. In what class is this lecture probably being given?28. What is remarkable about the black walnut tree outside Brett Hall?29. What is the problem with the elm tree near Jackson Hall?Passage 2What was the most popular mix about the United States in the th Century was that of the free and simple life of the farmer. It was said that the farmers worked hard on their own land to produce whatever their families needed. They might sometimes trade with their neighbors, but in general they could get along just fine by relying on themselves, not on commercial ties with others. This is how Thomas Jefferson idealized the farmers at the beginning of the th century. And at that time, this may have been close to the truth especially on the frontier. But by the mid century sweeping changes in agriculture were well under way as farmers began to specialized in the raising of crops such as cotton or corn or wheat. By late in the century revolutionary invents in farm machinery has vastly increased the production of specialized crops and extensive network of railroads had linked farmers throughout the country to market in the east and even overseas. By raising and selling specialized crops, farmers could afford more and finer goods and achieved much higher standard of living but at a price. Now farmers were no longer dependent just on the weather and their own efforts, their lives were increasing controlled by the banks, which had powder to grant or deny loans for new machinery, and by the railroads which set the rates for shipping their crops to the market. As businessmen, farmers now had to worry about national economic depression and the implement of world supply and demand on for example, the of price of wheat in hands. And so by the end of the th century, the era of Jeffersons independent farmer had come to a close.30. What is the main topic of the talk?31. According to the professor, what was the major change in the agriculture during the th century?32. According to the professor, what was one result of the increased use of machinery on farms of the United States?Passage 3It is common knowledge that music can have a powerful effect on our emotions. In fact, since 30s, music therapists have relied on music to soothe patients and help control pain. Now psychologists are confirming that music can also help relieve depression and improve concentration. For instance, in a recent study, surgeons were given some highly stressed math problems to solve. They were divided into three groups: one worked in silence, and in another, the surgeons listened to music of their choice on headphones; the third listened to classic music chosen by the researchers. The results of the study may surprise you. The doctors who got to choose their music experienced less stress and scored better than the others. One possible explanation is that listening to music you like stimulates the Alfa-wave in the brain, increases the heart rate and expands the breathing. That helps to reduce stress and sharpen concentration. Other research suggests a second relation between the music and the brain: by examining the students blood after they listening to a variety of classic music collections, the researchers found that some students showed a large increase in endorphin, a natural pain reliever, this supports what music therapists have known for years: Music can help rejuvenate or soothe the patient.33. According to the speaker how is the music therapy currently used in medicine?34 What did the study done with surgeons show?35. In the study of students exposed to classic music, what effect did the music have?Part III Compound dictationSleep is part of a persons daily activity cycle. There are several different stages of sleep and they occur in cycles, If you are an average sleeper, your sleep cycle is as follows. When you first drift off into slumber, your eyes will roll about a bit, your temperature will drop slightly, your muscles will relax, and your breathing will slow and become quite regular. Your brain waves slow down a bit too with the alpha rhythm of rather fast waves predominating for the first few minutes. This is called stage 1 sleep. For the next half hour or so as you relax more and more you will drift down through stage 2 and stage 3 sleeps. The lower your stage of sleep the slower your brain waves will be. Then about 40 to 60 minutes after you lose consciousness you will have reached the deepest sleep of all. Your brain w