单选题. Learning is an essential process for living things to acquire necessary skills and behaviors. Scientists have already found that there is a critical period for learning in man and animals. Once the right time for learning a skill or a certain behaviors has passed, this skill or behavior can never be properly learned. That we speak our own language perfectly and the languages we learn later imperfectly also depends on learning this skill at the right time. The brain develops in such a way that it is ready to learn to speak between the ages of about ten months and ten years. Languages learned later are not spoken perfectly. The ability to speak a language is a mixed motor and sensory skill. It is necessary to hear all the sounds, the subtle differences between similar but not identical sounds, the rhythm and tone of the language. One has also to work tongue, throat, and lips to control breathing. All this has to be managed at one and the same time. From some time after birth until the age of six or seven, normal children all learn this perfectly, and without much difficulty they can learn two or even three languages at the same time, without confusing one with the other. But later, most of us cannot acquire this skill. We may learn to write and read the new language perfectly, but to acquire the right accent and the ability to speak so that no one can detect that the language is not our mother tongue hardly ever occurs. But those of us who still want to learn foreign languages after these early milestones have been passed need not worry, for though we may not learn to speak a new language like the natives, we know from thousands of examples that we can go on learning languages beyond the age of eighty. There are so many activities adding up to the simple word "learning" that although some of the processes become less efficient with ageing of the brain, our actual experience of learning helps us in learning new materials. Normal social and emotional development probably also needs the correct stimulating at the right time. We can observe evidence of this in those rare cases of children who have been completely neglected from birth. Sometimes illegitimate children in the country are put away in barns to conceal their existence from the neighbors. They are taught nothing, not even to be house-trained or to speak. These children then grow up mentally defective. Even if they are found and rescued by the age of four or five, it is too late. Though they can be taught a lot, their speech is always inadequate and their brains never reach the standards of their brothers or sisters.1. What can we learn from the first paragraph about the critical period? ______

单选题Questions 1 to 10 are based on the following passage.Depression is a serious condition that_____1___ around 16 million U.S.adults.The condition is more common in women, but new research suggests that

单选题. Questions 19 to 21 are based on the recording you have just heard.4.

单选题48. Fashion designers are rarely concerned with vital things like warmth, comfort and ______.

单选题. Questions 12 to 15 are based on the passage you have just heard.4.

单选题Questions 1 to 10 are based on the following passage.Is your promotion really necessary? Many workers focus their hopes on climbing the hierarchy of their____1____.The prospect of higher pay helps exp

单选题. A wise man once said that the only thing necessary for the triumph of evil is for good men to do nothing. So, as a police officer I have some urgent things to say to good people. Days after days my men and I struggle to hold back a tidal wave of crime. Something has gone terribly wrong with our proud American way of life. It has happened in the area of values. A key ingredient is disappearing, and I think I know what it is: accountability. Accountability isn't hard to define. It means that every person is responsible for his or her actions and liable for their consequences. Of the many values that hold civilization together—honesty, kindness, and so on—accountability may be the most important of all. Without it, there can be no respect, no trust, no law—and, ultimately, no society. My job as a police officer is to impose accountability on people who refuse, or have never learned, to impose it on themselves. But as every policeman knows, external controls on people's behavior are far less effective than internal restraint such as guilt, shame and embarrassment. Fortunately, there are still communities—small towns, usually—schools maintain discipline and where parents hold up standards that proclaim: "In this family certain things are not tolerated—they simply are not done!" Yet more and more, especially in our large cities and suburbs, these inner restraints are loosening. Your typical robber has gone. He considers your property his property; he takes what he wants including your life if you enrage him. The main cause for this break-down is a radical shift in attitudes. Thirty years ago if a crime was committed, society was considered the victim. Now in a shocking reversal, it is the criminal who is considered victimize: by his underprivileged upbringing, by the school that didn't teach him to read, by the church that failed to reach him with moral guidance, by the parents who didn't provide a stable home. I don't believe it. Many others in equally disadvantaged circumstances choose not to engage in criminal activities. If we free the criminal, even partly, from accountability, we become a society of endless excuses where no one accepts responsibility for anything. We in America desperately need more people who believe that the person who commits a crime is the one responsible for it.1. What the wise man said suggests that ______.

单选题. Questions 23 to 25 are based on the recording you have just heard.8.

单选题. The public must be able to understand the basics of science to make informed decisions. Perhaps the most dramatic example of the negative consequences of poor communication between scientists and the public is the issue of climate change, where a variety of factors, not the least of which is a breakdown in the transmission of fundamental climate data to the general public, has contributed to widespread mistrust and misunderstanding of scientists and their research. The issue of climate change also illustrates how the public acceptance and understanding of science (or the lack of it) can influence governmental decision-making with regard to regulation, science policy and research funding. However, the importance of effective communication with a general audience is not limited to hot issues like climate change. It is also critical for socially charged neuroscience issues such as the genetic basis for a particular behavior, the therapeutic potential of stem cell therapy for neurodegenerative diseases, or the use of animal models, areas where the public understanding of science can also influence policy and funding decisions. Furthermore, with continuing advances in individual genome (基因组) sequencing and the advent of personalized medicine, more non-scientists will need to be comfortable analyzing complex scientific information to make decisions that directly affect their quality of life. Science journalism is the main channel for the popularization of scientific information among the public. Much has been written about how the relationship between scientists and the media can shape the efficient transmission of scientific advances to the public. Good science journalists are specialists in making complex topics accessible to a general audience, while adhering to scientific accuracy. Unfortunately, pieces of science journalism can also oversimplify and generalize their subject material to the point that the basic information conveyed is obscured or at worst, obviously wrong. The impact of a basic discovery on human health can be exaggerated so that the public thinks a miraculous cure is a few months to years away when in reality the significance of the study is far more limited. Even though scientists play a part in transmitting information to journalists and ultimately the public, too often the blame for ineffective communication is placed on the side of the journalists. We believe that at least part of the problem lies in places other than the interaction between scientists and members of the media, and exists because for one thing we underestimate how difficult it is for scientists to communicate effectively with a diversity of audiences, and for another most scientists do not receive formal training in science communication.1. What does the example of climate change serve to show? ______

单选题 What if we could read the mind of a terrorist

单选题. Questions 16 to 19 are based on the recording you have just heard.1.

单选题《复合题被拆开情况》 The U.S. and China don’t agree on much these days. Germany and France share a border and a currency but are frequently at odds. The U.K. and India like to march to their own drum. But there

单选题 "Does my smile look big in this

单选题[此试题无题干]

单选题. Questions 23 to 25 are based on the recording you have just heard.8.