单选题Ice can be used to keep food from Uspoiling/U.

单选题How does codification of the laws affect governmental agents?

单选题According to Henry Louis "Skip" Gates Jr. himself, giving advice to President Gore is ______.

单选题Gordon Shaw the physicist, 66, and colleagues have discovered what"s known as the "Mozart effect", the ability of a Mozart sonata, under the fight circumstances, to improve the listener"s mathematical and reasoning abilities. But the findings are controversial and have launched all kinds of crank notions about using music to make kids smarter. The hype, he warns, has gotten out of hand. But first, the essence: is there something abut the brain cells work to explain the effect? In 1978 the neuroscientist Vernon Mountacastle devised a model of the neural structure of the brain"s gray matter. Looking like a thick band of colorful bead work, it represents the firing patterns of groups of neurons. Building on Mountcastle, Shaw and his team constructed a model of their own. On a lark, Xiaodan Leng, who was Shaw"s colleague at the time, used a synthesizer to translate these patterns into music. What came out of the speakers wasn"t exactly toe-tapping, but it was music. Shaw and Leng inferred that music and brain-wave activity are built on the same sort of pattern. "Gordon is a contrarian in his thinking," says his longtime friend, Nobel Prize-Winning Standford Physicist Martin Perl. "That"s important. In new areas of science, such as brain research, nobody knows how to do it." What do neuroscientists and psychologists think of Shaw"s findings? They haven"t condemned it, but neither have they confirmed it. Maybe you have to take them with a grain of salt, but the experiments by Shaw and his colleagues are intriguing. In March a team led by Shaw announced that young children who had listened to the Mozart sonata and studied the piano over a period of months improved their scores by 27% on a test of ratios and proportions. The control group against which they were measured received compatible enrichment course—minus the music. The Mozart-trained kids are now doing math three grade levels ahead of their peers, Shaw claims. Proof of all this, of course, is necessarily elusive because it can be difficult to do a double blind experiment of educational techniques. In a double blind trial of an arthritis drug, neither the study subjects nor the experts evaluating them know which ones got the best treatment and which a dummy pill. How do you keep the participants from knowing it"s Mozart on the CD?

单选题In the search for solution to seemingly overwhelming problems, it became increasingly ______ to include radical, even revolutionary ideas.

单选题The conflict between romantic ______and harsh reality has been the theme of many great novels

单选题I'd ______ his reputation with other farmers and business people in the community, and then make a decision about whether or not to approve a loan.

单选题Stephen Schneider, a climatologist at Stanford, notes that unlike greenhouse gases, which ______ rapidly around the globe, the sulfate droplets tend to concentrate over industrialized regions. A. unify B. fragment C. disperse D. shatter

单选题At the Kyoto conference on global warming in December 1997, it became abundantly clear how complex it has become to work out international agreements relating to the environment because of economic concerns unique to each country. It is no longer (21) to try to forbid certain activities or to reduce (22) of certain substances. The global challenges of the inter-link between the environment and development increasingly (23) us to the core of the economic life of states. During the late 1980s we were able, through international agreements, to make deep (24) in emissions (25) the ozone layer. These reductions were made possible (26) the harmful substances could be replaced (27) negative effects on employment and the economies of states. Although the threat of global warming has been known to world for decades, we know that the effects of measures, (28) harsh measures taken in some countries, would be nullified if (29) countries do not control their emissions. Important and populous low- or medium-income countries are not (30) willing to undertake legal commitments about their energy uses. We must, (31) find a solution to the threat of global warming early in the 21st century. Such a (32) would require a degree of shared vision and common responsibilities new to humanity. Success lies in the force of imaginations, in imagining what (33) if we failed to act. Although many living in cold regions would welcome the global-warming effect of a warmer summer, (34) would cheer arrival of the (35) tropical diseases, especially where there has been none.

单选题The ratio of the work done by machine______the work done on it is called the efficiency of the machine.

单选题In ______ , the whole tangled saga is a classic case of serious allegations falling through the cracks between federal, state and local jurisdictions and between state lines.

单选题He is honest. His actions are always ______ his words.

单选题Inthatcountry,studentswillbe_____admittancetotheirclassroomiftheyarenotproperlydressed.

单选题Thus ______ between the developed and developing countries.

单选题Attending to a wife and six children ______ most of his times.

单选题In the case of mobile phones, change is everything. Recent research indicates that the mobile phone is changing not only our culture, but our very bodies as well. First, let"s talk about culture. The difference between the mobile phone and its parent, the fixed-line phone, is that a mobile number corresponds to a person, while a landline goes to a place. If you call my mobile, you get me. If you call my fixed-line phone, you get whoever answers it. This has several implications. The most common one, however, and perhaps the thing that has changed our culture forever, is the "meeting" influence. People no longer need to make firm plans about when and where to meet. Twenty years ago, a Friday night would need to be arranged in advance. You needed enough time to allow everyone to get from their place of work to the first meeting place. Now, however, a night our can be arranged on the run. It is no longer "see you there at 8", but "text me around 8 and we"ll see where we all are". Texting changes people as well. In their paper, "Insights into the Social and Psychological Effects of SMS Text Messaging", two British researchers distinguished between two types of mobile phone users: the "talkers" and the "texters"—those who prefer voice to text messages and those who prefer text to voice. They found that the mobile phone"s individuality and privacy gave texters the ability to express a whole new outer personality. Texters were likely to report that their family would be surprised if they were to read their texts. This suggests that texting allowed texters to present a self-image that differed from the one familiar to those who knew them well. Another scientist wrote of the changes that mobiles have brought to body language. There are two kinds that people use while speaking on the phone. There is the "speakeasy": the head is held high, in a self-confident way, chatting away. And there is the "spacemaker": these people focus on themselves and keep out other people. Who can blame them? Phone meetings get cancelled or reformed and camera-phones intrude on people"s privacy. So, it is understandable if your mobile makes you nervous. But perhaps you needn"t worry so much. After all, it is good to talk.

单选题The author mentions that English hterature "was not part of any academic curriculum" in the early nineteenth century in order to ______.