单选题If those "mad moments"—when you can"t remember what your friend has told you or where you left your keys—are becoming more frequent, mental exercises and a healthy brain diet may help. Just as bodies require more maintenance with the passing years, so do brains, which scientists now know show signs of aging as early as the 20s and 30s. "Brain aging starts at a very young age, younger than any of us had imagined and these processes continue gradually over the years," said Dr. Gary Small, the director of the Center on Aging at the University of California, Los Angeles. "I"m convinced that it is never too early to get started on a mental or brain-fitness program," he added. In his book, The Memory Bible, the 51-year-old neuroscientist (神经学家) lists what he refers to as the 10 suggestions for keeping the brain young. They include training memory, building skills, reducing stress, mental exercises, brain food and a healthy lifestyle. It"s a game plan for keeping brain cells sparking and neural networks in perfect shape. "Misplacing your keys a couple of times don"t mean you should start labeling your cabinets. Memory loss is not an inevitable consequence of aging. Our brains can fight back," he said. Small provides the weapons for a full-scale attack. Simple memory tests give an indication of what you are up against and tools such as "look" and "connect" are designed to make sure that important things such as names and dates are never forgotten. "So if you wanted to learn names and faces, for example, you meet Mrs. Beatty and you notice a distinguishing facial feature, maybe a high eyebrow," said Small. "You associate the first thing that comes to mind. I think of the actor Warren Beatty so I create a mental picture of Warren Beatty kissing her brow." Small admits it may sound a bit strange but he says it works. "Mental exercises could be anything from doing crossword puzzles and writing with your left hand if you are right handed or learning a language. It could be anything that is fun that people enjoy doing," he added. He also recommends physical exercise, a low-fat diet and eating foods rich in fatty acids, such as fish, nuts, and fruits and vegetables high in antioxidants (抗氧化剂) including blueberries and onions in addition to reducing stress.

单选题A: Look, it's going to storm. Take my umbrella.B: ______. A. How will you go home if you give it to me7 B. I have a raincoat in my office. Thanks anyway. C. I think you need to use it yourself. D. It doesn't matter. I will go without having your umbrella.

单选题According to the passage, who has/have the legal responsibility to decide on euthanasia?

单选题{{B}}Passage One{{/B}} With the possible exception of equal rights, perhaps the most controversial issue across the United States today is the death penalty. Many argue that it is an effective deterrent (威慑) to murder, while others maintain there is no convincing evidence that the death penalty reduces the number of murders. The principal argument advanced by those opposed to the death penalty, basically, is that it is cruel and inhuman punishment, that it is the mark of a brutal society, and finally that it is of questionable effectiveness as a deterrent to crime anyway. In our opinion, the death penalty is a necessary evil. Throughout recorded history there have always been those extreme individuals in every society who were capable of terribly violent crimes such as murder. But some are more extreme than others. For example, it is one thing to take the life of another in a fit of blind rage, but quite another to coldly plot and carry out the murder of one or more people in the style of a butcher. Thus, murder, like all other crimes, is a matter of relative degree. While it could be argued with some conviction that the criminal in the first instance should be merely isolated from society, such should not be the fate of the latter type murderer. The value of the death penalty as a deterrent to crime may be open to debate. But the overwhelming majority of citizens believe that the death penalty protects them. Their belief is reinforced by evidence which shows that the death penalty deters murder. For example, from 1954 to 1963, when the death penalty was consistently imposed in California, the murder rate remained between three and four murders for each 100 000 population. Since 1964 the death penalty has been imposed only once, and the murder rate has risen to 10.4 murders for each 100 000 population. The sharp climb in the state's murder rate, which began when executions stopped, is no coincidence (巧合). It is convincing evidence that the death penalty does deter many murderers. If the bill reestablishing the death penalty is vetoed (否决), innocent people will be murdered—some whose lives may have been saved if the death penalty were in effect. This is literally a life or death matter. The lives of thousands of innocent people must be protected.

单选题Woman: Well, the income tax is too high for me this month. Man: If it were not reasonable, I"m afraid some people would try to get round the tax. Question: What does the man mean?

单选题The ______ of the rural world because of distance and the lack of transport facilities is compounded by the paucity of the information media. A. inaccessibility B. isolation C. penetration D. negligence

单选题The framework of the special theory of relativity can be constructed from the ______ of the absolute invariability of the speed of light. A. regulation B. conviction C. definition D. assumption

单选题In learning a foreign language, ______ English, one should first pay attention to speaking, which is the groundwork of reading and writing. A. says B. say C. to say D. saying

单选题I saw a television advertisement recently for a new product called an air sanitizer. A woman stood in her kitchen, spraying the empty space in front of her as though using Mace against an imaginary assailant. She appeared very determined. Where others are satisfied with antibacterial-laced sponges, dish soaps, hand sanitizers and telephone wipes, here was a woman who sought to sterilize the air itself. As a casual student of microbiology, I find it hard to escape the absurdity here. This woman is, like any human being, home to hundreds of trillions of bacteria. Bacteria make up a solid third, by weight, of the contents of her intestines. If you were to sneak into her bathroom while she was showering—and based on my general impression of this woman from the advertisement, I don't recommend this—and secret away a teaspoon of the water at her feet, you would find some 820 billion bacteria. Bacteria are unavoidably, inevitably—and, usually, utterly benignly—a part of our world. The fantasy of a germ-free home is not only absurd, but it is also largely pointless. Unless you share your home with someone very old, very young (under 6 months) or very ill, the few hundred bacteria on a countertop, doorknob or spoon pose no threat. The bacteria that cause food poisoning, the only significant rational bacterial worry in the average home, need to multiply into the thousands or millions before they can overwhelm your immune system and cause symptoms. The only way common food poisoning bacteria can manage this is to spend four or five hours reproducing at room temperature in something moist that you then eat. If you are worried about food poisoning, the best defense is the refrigerator. If you don't make a habit of eating perishable food that has been left out too long, don't worry about bacteria. Viruses are slightly different. You need only pick up a few virus particles to infect yourself with a cold or flu, and virus particles can survive on surfaces for days. So disinfecting the surfaces in the home should, in theory, reduce the chances of picking up a bug. In practice, the issue is less clear. A study by Dr. Elaine Larson at the Columbia School of Nursing called into question the usefulness of antibacterial products for the home. In New York, 224 households, each with at least one preschooler, were randomly assigned to two groups. One group used antibacterial cleaning, laundry and hand-washing products. The other used ordinary products. For 48 weeks, the groups were monitored for seven symptoms of colds, flu and food poisoning—and found to be essentially the same. According to Dr. Gerba' s research, an active adult touches an average of 300 surfaces every 30 minutes. You cannot win at this, You will become obsessive-compulsive. Just wash your hands with soap and water a few times a day, and leave it at that.

单选题A: Have you a single room with bath for tonight and tomorrow night?B: ______. A. Yes. The rooms have been sold out. B. No. Just a moment, please. C. Yes, our rooms are very good. D. Sorry, we haven't any singles left, I'm afraid.

单选题Weather ______, we'll go for a walk in the woods tomorrow. A. to permit B. permitted C. permitting D. permits

单选题Some people view the findings with caution, noting that a cause-and-effect relationship between passive smoking and cancer remains ______. A. to be shown B. to have shown C. to have been shown D. being shown

单选题He ______ a little money every week so as to have something for a rainy day. A. put back B. put out C. put aside D. put in

单选题We all know that it is very hard to ______ him to give his plan up. A. endeavor B. reduce C. assert D. induce

单选题Man: I'm still waiting for my sister to come back and type the application letter for me.Woman: Why bother her? I'll show you how to use the computer. It's quite easy.Question: What does the woman mean?

单选题A team can accomplish much more than the sum of its individual members and yet frequently groups of people are seen to achieve less than ______ by the individual member working together. A. could have been accomplished B. must have been accomplished C. should be accomplished D. would be accomplished

单选题W: You look like you are freezing to death. Why don"t you put this on? M: Thank you. It was so warm at noon, I didn"t expect the weather to change so quickly. Question: What do we learn from the conversation?

单选题In Second Nature, Nobel Prize-winning neuroscientist Gerald Edelman argues that the brain and mind are unified, but he has little patience with the claim that the brain is a computer. Fortunately for the general reader, his explanations of brain function are accessible, reinforced by concrete examples and metaphors. Edelman suggests that thanks to the recent development of instruments capable of measuring brain structure within millimeters and brain activity within milliseconds, perceptions, thoughts, memories, willed acts, and other mind matters traditionally considered private and impenetrable to scientific scrutiny now can be correlated with brain activity. Our consciousness (a "first-person affair" displaying intentionality, reflecting beliefs and desires, etc.), our creativity. The author describes three unifying insights that correlate mind matters with brain activity. First, even distant neurons will establish meaningful connections (circuits) if their patterns are synchronized. Second, experience can either strengthen or weaken synapses (neuronal connections). Finally, there is reentry, the continued signaling from one brain region to another and back again along massively parallel nerve fibers. Edelman concedes that neurological explanations for consciousness and other aspects of mind are not currently available, but he is confident that they will be soon. Meanwhile, he is comfortable hazarding a guess: "All of our mental life ... is based on the structure and dynamics of our brain," Despite this optimism about the explanatory powers of neuroscience, Edelman acknowledges the pitfalls in attempting to explain all aspects of the mind in neurological terms. Indeed, culture—not biology—is the primary determinant of the brain's evolution, and has been since the emergence of language, he notes. However, I was surprised to learn that he considers Sigmund Freud "the key expositor of the effects of unconscious processes on behavior. " Such a comment ignores how slightly Freud's conception of the unconscious, with its emphasis on sexuality and aggression, resembles the cognitive unconscious studied by neuroscientists. Still, Second Nature is well worth reading. It serves as a bridge between the traditionally separate camps of "hard" science and the humanities. Readers without at least some familiarity with brain science will likely find the going difficult at certain points. Nonetheless, Edelman has achieved his goal of producing a provocative exploration of "how we come to know the world and ourselves. /

单选题It is very necessary to know the extent ______ supply and demand will influence the price.

单选题They have been waiting for many hours. The airplane must have been ______.