64. In the author’s opinion, it is possible that ______.

　 A. some extinct species may be cloned, but not survive

　 B. extinct species may be cloned and easily survive

　 C. a gaur can have a monkey as a surrogate mother

　 D. all the extinct species may be cloned

63. The difficulty in cloning an extinct species is the lack of ______.

　 A. both the well-preserved DNA and plants to live on

　 B. both the habitat to live in and the well-preserved DNA

　 C. both habitat to live in and plants to live on

　 D. both the well-preserved DNA and a surrogate mother

62. The underlined words “a surrogate mother” probably refer to a female who -----

A. contributes its eggs to another female　 B. gives birth to a baby for another female

C. gives birth to a baby of its own　　　　 D. cannot give birth to a baby

61. It can be learned from the text that ________.

A. scientists have cloned the African bongo antelope

B. both the cheetah and the giant panda live in Asia

C. the gaur lives in Asia and is endangered　 D. the gaur is an extinct species

60. The author tells the story of the lost man as an example of people who __________.　 A. go into the woods by themselves

　　　　　　　　　　　　　　　　　　　　 B. don’t know how to signal for help properly

　　　　　　　　　　　　　　　　　　　　 C. are frightened when they think they are lost

　　　　　　　　　　　　　　　　　　　　 D. notice everything when stepping from the highway

F

　　 Have you seen Jurassic Park? In this film, scientists use DNA kept for tens of millions of years to clone dinosaurs. They find trouble, however, when they realize that the cloned creatures are smarter and more dangerous than expected. That’s nothing more than a fiction.

　　 But could we really clone endangered animals? 　　 To date, the most successful attempt to do so was the cloning of a gaur, a rare ox-like animal from southeast Asia. Scientists used a cow to bring the cloned baby gaur, named Noah. Two days after birth, however, Noah died from a common bacterial infection. Other endangered species that may be cloned include the African bongo antelope (邦戈羚羊), the Sumatran tiger, the cheetah (猎豹), and the giant panda.　　 Next, could we really clone extinct animals?

　　 In theory? Yes. To do this, you need a well-kept source of DNA from the extinct animals such as wool mammoth (毛象), Tasmanian tiger, or even dinosaur, and a closely related species, still living, which could serve as a surrogate mother.

　　 In reality? Probably not. On the one hand, it’s not likely that extinct animals’ DNA could survive undamaged for such a long time. Cloning extinct animals as wool mammoth, Tasmanian tiger, or dinosaur is much more difficult due to the lack of properly well-preserved DNA. On the other hand, for example, a gaur can have a cow as a surrogate mother, definitely not a monkey. But what about an extinct animals as unique as the panda? What species could possibly serve as a surrogate mother? 　　 Cloning presents many exciting possibilities. However, even if extinct animals are brought back, they could not survive in today’s world. Not only do most extinct animals have no habitat to love in, but the other plants and animals they depended on for food may also be gone as well.

59. When a person tries to find his way in the woods, __________ is the most important　 A. intelligence　 B. observation　　　　　　　　　　　　 C. direction　　　　 D. chance

58. According to the passage, if a person gets lost in the forest, at the very beginning, he would __________.

　　　 A. worry about being laughed at B. push himself to find his way out

　　　 C. feel it is convenient to ask for help from his friends

　　　 D. be concerned about being frightened by wild animals

56. Which would be the best title of the passage?

　　　 A. Mr. Bayer, a Brave Hunter　　　　 B. Russian Bears, Dangerous Animals

　　　 C. Don’t Hunt in Russia　　　　　　　　　 D. Don’t Deal with the Russians

E　　 The Pathfinder

　　 When we found him, he was a sorry sight. His clothes were torn, his hands bleeding. Before we reached him, we saw him fall. He lay a moment. Then he pulled himself to his feet, walked unsteadily a few yards through the woods and fell again.

　　　 After we got him out, we went back to find the gun that he had thrown down. His tracks showed that for two days he had circled in the forest, within 200 yards of the road. His senses were so dulled by fear and tiredness that he did not hear the cars going by or see the lights at night.

　　　 We found him just in time.

　　　 This man, like others before him, had simply been frightened when he knew he was lost. What had been a near disaster might have turned out as only a pleasant walk, had he made a few preparations before he stepped from the highway or off a known path.

　　　 Whatever sense of direction that a man may have, it’s still largely a question of observation. A skilled woodsman always keeps an eye on his surroundings. He notes that the shape of a mountain, the direction water flows through a swamp, and the way a tree leans across a path. With these in mind, he may be turned around many times, but he is seldom lost.

　　　 There are exceptions, of course, and once in a while a man does come across some strange problem that puts him into the “lost” situation. A rainstorm or sudden blizzard may catch him without a compass(指南针)in his pocket. Darkness may find him in a rough area, where travel is dangerous without a light.

　　　 When this happens, the normal first reaction(反应)is the fear of being laughed at as a result of his poor knowledge in the woods. He may also be concerned about the inconvenience that he will cause his friends when he doesn’t show up. This false pride may lead him to keep on the move in a false effort to find his way against all difficulties.

　　　 The person who thinks ahead is seldom in great danger. He’ll be safe if he observes carefully, thinks ahead, and remains calm.

　57 The author suggested that if the man had not been found, he would have __________.

　　　 A. been shot by a gun　 　　　　　　　　 B. become confused

　　　 C. been attacked by wild animals　　　　　　　　　　　　　　　　　　　　 D. been in great danger

55. We can infer from the last paragraph that __________.

　　　 A. Mr. Bayer has gone ma　　 B. the bear injured him badly

　　　 C. he has worked in a mental institution since then

　　　 D. the trade has gone smoothly between Russian and Iraq

54. Why did the Russians say “Be careful, the Russian bears are very dangerous, and frightening”?

　　　 A. To tell Mr. Bayer that many people had been killed by bears.

　　　 B. To make Mr. Bayer feel the hunting really challenging.

　　　 C. To warn Mr. Bayer to mind his safety while hunting.

　　　 D. To tell Mr. Bayer that the bear is really dangerous.