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Passage TwoQuestions 29 to 31 are based on the passage you have just heard.
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The amazing success of humans as a (91) is the result of the evolutionary development of our brains which has led, among other things, to tool-using, tool-making, the (92) to solve problems by logical reasoning, thoughtful cooperation, and language. One of the most striking ways in which chimpanzees biologically (93) humans (94) in structure of their brains. The chimpanzee, with the capacity for (95) reasoning, (96) a type of intelligence more like that of humans than (97) any other mammal living today. The brain of the modern chimpanzee is probably not too dissimilar (98) the brain that so many millions of years ago (99) the behavior of the first ape man. For a long time, the fact that prehistoric people made (100) was considered to be one of the major (101) distinguishing them from other creatures. (102) pointed out earlier, I have watched chimpanzees (103) grass stems in order to use them to probe for termites. It is tree that the chimpanzee does not (104) tools to "a regular and set pattern"—but then, (105) people, before their development of stone tools, undoubtedly poked around (106) sticks, and straws, at which stage it seems (107) , that they made tools to a set pattern either. It is because of the close (108) in most people’s minds of tools with humans (109) special attention has always been focused upon any animal able to use an object as a tool: but it is important to realize that this ability, on its own, does not necessarily indicate any special intelligence in the creature (110) .
Many people wrongly believe that when people reach old age,-their families place them in nursing homes. They are left in the (51) of strangers for the rest of their lives. Their (52) children visit them only occasionally, but more often, they do not have any regular visitors. The truth is that this idea is an unfortunate myth-an (53) story. In fact, family members provide over 80 percent of the care (54) elderly people need. Samuel Prestoon, a sociologist, studied (55) the American family is changing. He reported that by the time the average American couple reaches 40 years of age, they have more parents than children (56) , because people today live longer after an illness than people did years (57) , family members must provide long term care. More psychologists have found that all caregivers (58) a common characteristic: All caregivers believe that they are the best people for the job. In other words, they all felt that they (59) do the job better than anyone else. Social workers (60) caregivers to find out why they took (61) the responsibility of caring for an elderly relative. Many caregivers believed they had obligation to help their relative. Some stated that helping others (62) them feel more useful. Others hoped that by helping (63) now, they would deserve care when they became old and (64) . Caring for the elderly and being taken care of can be a mutually satisfying experience for everyone who might be (65) .
1. If you want to stay young, sit down and have a good think. This is the research finding of a team of Japanese doctors, who say that most of our brains are not getting enough exercise--and as a result, we are ageing unnecessarily soon. 2. Professor Taiju Matsuzawa wanted to find out why otherwise healthy farmers in northern Japan appeared to be losing their ability to think and reason at a relatively early age, and how the process of ageing could be slowed down. 3. With a team of colleagues at Tokyo National University, he set about measuring brain volumes of a thousand people of different ages and varying occupations. 4. Computer technology enabled the researchers to obtain precise measurements of the volume of the front and side sections of the brain, which relate to intellect(智能)and emotion, and determine the human character. (The rear section of the brain, which controls functions like eating and breathing, does not contract with age, and one can continue living without intellectual or emotional faculties. ) 5. Contraction of front and side parts--as cells die off--was observed in some subjects in their thirties, but it was still not evident in some sixty and seventy-year-olds. 6. Matsuzawa concluded from his tests that there is a simple remedy to the contraction normally associated with age--using the head. 7. The findings show in general terms that contraction of the brain begins sooner in people in the country than in the towns. Those least at risk, says Matuzawa, are lawyers, followed by university professors and doctors. White collar workers doing routine work in government offices are, however, as likely to have shrinking brains as the farm worker, bus driver and shop assistant. 8. Matsuzawa’s findings show that thinking can prevent the brain from shrinking. Blood must circulate properly in the head to supply the fresh oxygen the brain ceils need. "The best way to maintain good blood circulation is through using the brain", he says, "Think hard and engage in conversation. Don’t rely on pocket calculators.\ The rear section of the brain controls functions like ______.
An international team of research scientists has created a new kind of rice that contains Vitamin A. The researchers used genetic engineering to create the new rice. Genetic engineering is the technology of changing the genes of living things. The researchers say the rice could help millions of people who do not get enough Vitamin A in the food they eat. The findings were published in Science magazine. Vitamin A is necessary for the body’s natural defense system against disease. Vitamin A is needed to help prevent skin and other tissues from drying out. It also produces a light-sensitive substance in the eyes. People who do not get enough Vitamin A cannot see well in the dark. They may develop a condition that dries the eyes. The condition can result in infections that lead to blindness. A lack of Vitamin A is a major cause of blindness among children. Health experts estimate that 124 million children around the world do not eat enough foods with Vitamin A. Vitamin A is found in fish liver oil and in the yellow part of eggs. Vegetables such as carrots and sweet potatoes contain beta carotene, a substance that the body changes into Vitamin A. Public health campaigns to provide Vitamin A to those who need it have proved costly. And they are not always effective. That has led researchers to try to create foods with the vitamin. Rice is one of the most common crops grown worldwide. However, normal rice lacks Vitamin A. Researchers at a laboratory in Switzerland found a way to change the genetic material of rice. They added three genes to the rice. The genes produce beta carotene, the chemical that our bodies change into Vitamin A. The new rice has a golden yellow color. The researchers say 200 grams of the rice have enough beta carotene to provide the necessary amount of Vitamin A. Biologist Mary Lou Guerinot of Dartmouth College wrote a commentary published with the report in science magazine. She said the rice is an excellent example of the good things that can be done with genetic engineering. However, critics of genetic engineering argue that changing plant genes could increase risks to human health or the environment. According to the passage, genetic engineering is a new way to help people keep healthy.
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