单选题 Proper street behavior in the United States requires a nice balance of attention and inattention. You are supposed to look at a{{U}} {{U}} 1 {{/U}} {{/U}}just enough to show that you are{{U}} {{U}} 2 {{/U}} {{/U}}of his presence. If you look too little, you appear proud,{{U}} {{U}} 3 {{/U}} {{/U}}much and you are curious. Usually what happens is that people{{U}} {{U}} 4 {{/U}} {{/U}}each other until they are about eight feet{{U}} {{U}} 5 {{/U}} {{/U}}, at which point both cast down their eyes. Sociologist Erring Goffman{{U}} {{U}} 6 {{/U}} {{/U}}this as "a king of dimming of lights". Much of eye behavior is so{{U}} {{U}} 7 {{/U}} {{/U}}that we react to it only on the intuitive level. The next time you have a{{U}} {{U}} 8 {{/U}} {{/U}}with someone makes you feel liked, notice what he does with his eyes.{{U}} {{U}} 9 {{/U}} {{/U}}are he looks at you more often than is usual with{{U}} {{U}} 10 {{/U}} {{/U}}a little longer than the normal. You interpret this as a sign -- a polite one --{{U}} {{U}} 11 {{/U}} {{/U}}he is interested in you as a person{{U}} {{U}} 12 {{/U}} {{/U}}than just in the topic of conversation. Probably you also feel that he is both{{U}} {{U}} 13 {{/U}} {{/U}}and sincere. All this has been demonstrated in elaborate{{U}} {{U}} 14 {{/U}} {{/U}}. Subjects sit and talk in the psychologist's laboratory,{{U}} {{U}} 15 {{/U}} {{/U}}of the fact that their eye behavior is being{{U}} {{U}} 16 {{/U}} {{/U}}from a one-way vision screen. In one fairly typical experiment,{{U}} {{U}} 17 {{/U}} {{/U}}were induced to cheat while performing a task, then were{{U}} {{U}} 18 {{/U}} {{/U}}and observed. It was found that those who had{{U}} {{U}} 19 {{/U}} {{/U}}met the interviewer's eyes less often than was{{U}} {{U}} 20 {{/U}} {{/U}}, an indication that "shifty eyes" -- to use the mystery writers' stock phrase -- can actually be a tip-off to an attempt to deceive or to feelings of guilt.

单选题Advertising is useful to the economy in the sense that.

单选题 {{I}}Questions 14 -16 are based on the following passage. You now have 15 seconds to read questions 14 -16.{{/I}}

单选题Many Americans have a grossly distorted and exaggerated view of most of the risks surrounding food. Fergus Clydesdale, head of the department of food science and nutrition at the University of Massachusetts-Amherst, says bluntly that if the dangers from bacterially contaminated chicken were as great as some people believe, "The streets would be littered with people lying here and there." Though the public increasingly demands no-risk food, there is no such thing. Bruce Ames, chairman of the biochemistry department at the University of California, Berkeley, points out that up to 10% of a plant's weight is made up of natural pesticides, says he: "Since plants do not have jaws or teeth to protect themselves, they employ chemical warfare." And many naturally produced chemicals, though occurring in tiny amounts, prove in laboratory tests to be strong carcinogens—a substance which can cause cancer. Mushrooms might be banned if they were judged by the same standard that apply to food additives. Declares Christina Stark, a nutritionist at Cornell University: "We've got far worse natural chemicals in the food supply than anything man-made." Yet the issues are not that simple. While Americans have no reason to be terrified to sit down at the dinner table, they have every reason to demand significant improvements in food and water safety. They unconsciously and unwillingly take in too much of too many dangerous chemicals. If food already contains natural carcinogens, it does not make much sense to add dozens of new man-made ones. Though most people will withstand the small amounts of contaminants generally found in food and water, at least a few individuals will probably get cancer one day because of what they eat and drink. To make good food and water supplies even better, the Government needs to tighten its regulatory standards, stiffen its inspection program and strengthen its enforcement policies. The food industry should modify some long-accepted practices or turn to less hazardous alternatives. Perhaps most important, consumers will have to do a better job of learning how to handle and cook food properly, The problems that need to be tackled exist all along the food-supply chain, from fields to processing plants to kitchens.

单选题Questions 17—20 are based on the following text about how to solve the generation gap. You now have 20 seconds to read Questions 17—20.

单选题The play Metamorphoses was successful because ______.

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单选题As time goes on, how to do good critical thinking is increasingly marginalized or even left out of the modern educational process. Critical thinking involves a mental process that is highly disciplined and therefore requires most practitioners to be trained in it. This training is best begun in the formative years, and it is best taught by energetic, motivated teachers who continually challenge, and debate, and demand increasingly rigorous thinking of their young students. However, as in all things, it is never too late to begin. Critical thinking is the process of evaluating and analyzing a proposition or an argument that has been offered to the thinker, for criticism, as being true. There follows a process of reasoning, evaluation of the offered evidence, and reflection, always begun from a point of skepticism. A proper critique of the offered argument involves more than direct observation. Besides reasoning, cognition and experience, proper critical thinking also involves intellectual values that go beyond the specific argument or object being critically examined. These intellectual values involve objective truth. Objective truth is that truth which comes from somewhere outside of our minds. Subjective truth is that truth which comes from within us; that which we feel, or sense, or believe to be true. Objective truth stands alone, and does not depend upon us to remain true; it"s completely independent of the mind of man. No matter what we think about it, how we think about it, or even if we think about it, objective truth remains objective truth, unchanged, and impervious. Objective truth must always be taken into consideration in order to do good critical thinking. There are different forms of objective truth, ranging from solid to ephemeral. In the "hard science" fields, such as mathematics, physics and chemistry, the most recognized objective truths involve proven mathematical formulae, or recognized scientific laws, or widely recognized and as yet unrefuted scientific theories. These "hard" objective truths are taken by the critical thinker to be axioms or givens, and thus, useful tools to help in the critical thinking process. The process thereby builds upon a foundation of previously proven truth. No matter how technically advanced we ever become, we are all, individually and collectively, called to think about things. It is our human nature.

单选题Whatmaterialswerenotusedforroadsurfacesduringthelastcentury?A.Gravel.B.Asphalt.C.Macadam.D.Concrete.