题目内容
I climbed the stairs slowly, carrying a big suitcase, my father following with two more. By the time I got to the third floor, I was (36) and at the same time feeling lonely. Worse still, Dad (37) a step and fell, sending my new suitcases (38) down the stairs. "Damn!" he screamed, his face turning red. I knew trouble was ahead. Whenever Dad’s face turns red, (39) !How could I ever (40) him to finish unloading the car (41) screaming at me or making a scene in front of the other girls, girls I would have to spend the (42) of the year with Doors were opening and faces were peering out (探出), as Dad walked (43) close behind. I felt it in my bones that my college life was getting off to a bad start.(44) the room quickly," I thought. "Get him into a chair and to calm down." But (45) , would there be a chair in Room 316 Or would it be an empty room(46) I turned the key in the lock and (47) the door open, with Dad (48) complaining about a hurting knee or something. I put my head in, expecting the worst. But to my (49) , the room wasn’t empty at all! It had furniture, curtains, a TV, and even paintings on the walls.And there on a well-made bed sat Amy, my new roommate, dressed neatly. Greeting me with a nod, she said in a soft voice, "Hi, you must be Gori." Then, she (50) the music and looked over at (51) . "And of course, you’re Mr. Faber," she said, (52) . "Would you like a glass of iced tea" Dad’s face turned decidedly (53) before he could bring out a "yes".I knew (54) that Amy and I would be (55) and my first year of college would be a success. 43().
查看答案
搜索结果不匹配？点我反馈
更多问题
The evolution of sex ratios has produced, in most plants and animals with separate sexes, approximately equal numbers of males and females. Why should this be so Two main kinds of answers have been offered. One is couched in terms of advantage to population. It is argued that the sex ratio will evolve so as to maximize the number of meetings between individuals of the opposite sex. This is essentially a "group selection" argument. The other, and in my view correct, type of answer was first put forward by Fisher in 1930. This "genetic" argument starts from the assumption that genes can influence the relative numbers of male and female offspring produced by an individual carrying the genes. That sex ratio will be favored which maximizes the number of descendants an individual will have and hence the number of gene copies transmitted. Suppose that the population consisted mostly of females, then an individual who produced sons only would have more grandchildren. In contrast, if the population consisted mostly of males, it would pay to have daughters. If, however, the population consisted of equal numbers of males and females, sons and daughters would be equally valuable. Thus a one-to-one sex ratio is the only stable ratio; it is an "evolutionarily stable strategy." Although Fisher wrote before the mathematical theory of games had been developed, his theory incorporates the essential feature of a game that the best strategy to adopt depends on what others are doing. Since Fisher’s time, it has been realized that genes can sometimes influence the chromosome or gamete in which they find themselves so that the gamete will be more likely to participate in fertilization. If such a gene occurs on a sex-determining (X or Y) chromosome, then highly aberrant sex ratios can occur. But more immediately relevant to game theory are the sex ratios in certain parasitic wasp species that have a large excess of females. In these species, fertilized eggs develop into females and unfertilized eggs into males. A female stores sperm and can determine the sex of each egg she lays by fertilizing it or leaving it unfertilized. By Fisher’s argument, it should still pay a female to produce equal numbers of sons and daughters. Hamilton, noting that the eggs develop within their host—the larva of another insect—and that the newly emerged adult wasps mate immediately and disperse, offered a remarkably cogent analysis. Since only one female usually eggs in a given larva, it would pay her to produce one male only, because this one could fertilize all his sisters on emergence. Like Fisher, Hamilton looked for an evolutionarily stable strategy, but he went a step further in recognizing that he was looking for a strategy. It can be inferred from the passage that the mathematical theory of games has been ______.
Americans smoke six thousand million cigarettes every year, that is, every person smokes about 4,195 cigarettes a year in the country of 18 years of age or more. It has been calculated that 51% of American men smoke while 34% of American women do so.Since 1939, scientific studies have shown that smoking does great harm to one’s health and it will shorten one’s life.Cigarette smoking is believed, by most research workers in the field, a very important cause in the development of the cancer of the lungs and the cancer of the throat and is believed to have much to do with some other kinds of cancers. Cigarette smokers suffer from the illness of the heart more often than those who don’t smoke. But strange, yet true, women are thought to be less affected, because when women smoke, they usually don’t breathe in the smoke so deeply. Most of doctors and researchers say, "Give up smoking. If you don’t smoke--don’t start!"Filters (过滤嘴) are required now to make smoking a bit safer, but they can only reduce, not get rid of, its poison.But there are still a number of doctors and research workers who are less sure of the effect of cigarette smoking on health. They believe that the cancers of the lungs, the throat and so on may also be caused by air pollution, or chemical poison that is now being used by farmers in large quantities to destroy plant pests and small animals. Most doctors and research workers advise that ().
From 1948 to 1961, the proportion of American blacks earning less than $3,000 a year declined from 78 to 47 percents at the same time, blacks earning more than $10,000 increased ______ from less than 1 to 17 percent. (proportion)
Museums have changed. They are no longer places that one "should" go to but now they are places to enjoy.At a science museum in Canada, you can feel your hair stand on end as harmless electricity passes through your body. At the Children’s Museum in New York, you can play an African drum. There are no "Do Not Touch" signs in some other museums in the USA.More and more museum directors have realized that people learn best when they can become part of what they are seeing. In many science museums, the visitors are encouraged to touch, listen, operate and experiment so as to discover scientific rules for themselves.The purpose is not only to provide fun, but also help people feel at home in the world of science. If people don’t understand science, they will be afraid of it; and if they are afraid of science, they will not make the best use of it.One cause of all these changes is the increase in wealth and spare time. Another cause is the growing number of young people in the population. Many of them are college students or college graduates. They see things in a new and different way. They want art that they can take part in. The same is true of science and history.The old museums have been changing and the government is encouraging the building of new and modern museums. In the United States and Canada, there are more than 6,000 museums, almost twice as many as there were 25 years ago. The growing population of young people caused the changes in museums because ().
微信支付 
支付宝支付