考试吧恩波：2008年12月六级预测试卷及解析(五)

　　Section B

　　26. A 27. A 28. D 29. A 30. D 31. D 32. D 33. D 34. A 35. D

　　Passage One

　　Welcome to Yellow Stone National Park. Before we begin our nature walk today, I’d like to give you a short history of our national park service. The national park service began in the late 1800s. A small group of explorers had just completed a month long exploration of the region that is now Yellow Stone. They gathered around the campfire and after hours of discussion, they decided that they should not claim this land for themselves. They felt it should be accessible to everyone. So they began a campaign to preserve this land for everyone’s enjoyment. Two years later, in the late 19 century, an act of congress signed by President Ulysses S. Grant, proclaimed the Yellow Stone region a public park. It was the first national park in the world. After Yellow Stone became a public park, many other areas of great scenic importance were set aside. And in 1916 the national park service was established to manage these parks. As a park ranger, I am an employee of the national park service. In the national park, park rangers are on duty at all the times to answer questions and help visitors in any difficulty. Nature walks, guided tours and campfire talks are offered by specially trained staff members. The park service also protect the animals and plants within the parks.

　　26. According to the speaker, who originated the idea of the public park?

　　27. What does the speaker say about Yellow Stone National Park?

　　28. According to the speaker, what is one of the duties of a park ranger?

　　Passage Two

　　Is your family interested in buying a dog? A dog can be a happy addition to your family, but if you choose the wrong kind of dog, the consequences can cause you a lot of trouble.Families should sit down and thoroughly discuss the problems involved before buying a dog. Even if the children in your family are the ones who want the dog, the parents are the ones who are really responsible for seeing that the animal is properly cared for. If you don’t know much about dogs, it’s a good idea to go to the library or the ASPCA for books about various kinds of dogs, as well as books about how to train a puppy. In reading about the different breeds, you should know that a dog described as very alert may be too jumpy and bouncy. When a book describes a dog as an ideal hunting dog, it probably means that the dog won’t be happy living in a small apartment. Dog breeds vary in popularity as the years go by. One of the most popular dogs these days is the German shepherd, this is because it provides protection as well as companionship. The family should be warned that these dogs grow up to be very big, and may be too powerful for children to handle. If space is limited, they need to be walked daily, since they cannot exercise in the space available at home.

　　29. How can one get information about the different kinds of dogs?

　　30. Why is the German shepherd a popular dog?

　　31. What are the advantages of choosing a toy dog?

　　Passage Three

　　Scientists have observed that plants themselves produce many poisonous chemicals for defense against insects. But insects have developed ways of dealing with them and, in fact, have been eating plants for about 250 million years. Now insects are using these same mechanisms to deal with man-made poisons-insecticides. This is why resistance of insects to insecticides has developed so rapidly. What should be done? Scientists studying the problem suggest that farmers use less insecticides. At the moment, farmers regularly spray crops as a precaution against problems that are caused by large numbers of pests. They should, instead, spray only where pests have actually been seen. Secondly, farmers could use a combination of two or three insecticides at once. To survive, the insects would need to become resistant to two or more poisons at the same time. The most surprising suggestion, perhaps, is that, at certain times of the year, farmers should actually try to attract new insects onto the crops they are trying to protect. The new insects will mate with those which survived from a certain kind of insecticide and will lessen the latter’s resistance to it.

　　Scientists hope that these and other measures will postpone the day when farmers and scientists will have to stand by while new super bugs which may be resistant to all our poisons invade our farms and devour our crops.

　　32. What alarming conclusion can be drawn from the scientists’observation?

　　33. Which of the following is NOT included in the scientists’suggestions?

　　34. What can be inferred from the passage?

　　35. What do you think is the best title for the passage?

　　Section C

　　Imagine this: you wake up each morning to find your sister lying beside you. To get dressed and tie your (36) shoes, you use one hand and she uses another, you do everything else together too, even sitting on the same chair at lunch and (37) riding on the same bicycle. That’s what life is like for six-year-old Betty and Abey. Like most (38) twins, the two girls look very much alike. But unlike most twins, Betty and Abey (39) share parts of the same body. Twins like Betty and Abey are (40) rare, only about 40 sets are born in the United States each year. Few (41) survive as long as Betty and Abey. That is because twins often share vital organs like a heart or (42) brain. These shared organs are often badly shaped, and may not be strong enough to support both twins. But Betty and Abey each had her own head, heart and stomach which (43) function normally. The girls share 3 or 4 lungs which provide plenty of oxygen for both twins. (44) Most their completely shared organs lie below the waist. Betty and Abey live relatively normal lives, they attend a regular school and each does her own school work. They prefer to do some projects together, though. (45) For example, to cut out paper dolls, one twin holds the paper while the other uses the scissors. But sometimes the girls don’t want to do the same thing. (46) For example, sometimes they want to play with different toys. What do they do then? “We cast a coin.” Says Abey.