【文章內(nèi)容簡介】 protects personal information from being disturbed.（3）Why did the researchers study the device according to Yingying Chen? A.To save money and labour.B.To make full use of WiFi.C.To protect passengers39。 privacy.D.To research dangerous objects.（4）Which of the following can replace the underlined word “ameliorating in the last paragraph? A.Confirming.B.Improving.C.Discovering.D.Examining.【答案】 （1）B（2）D（3）A（4）B 【解析】【分析】本是一篇說明文，介紹了研究人員發(fā)現(xiàn)，WiFi可用于可用于安檢。 （1）考查段落大意。根據(jù)第三段中的“The detection system analyzes what happens when wireless signals go through and bounce off objects or materials.”這個檢測系統(tǒng)分析信號在物體和材料上穿透和反射時會發(fā)生什么?？芍xB。 （2）考查細(xì)節(jié)理解。根據(jù)第四段中的“noting its design can inspect bags or luggage without being an exposure to privacy.”可知，不用打開和檢查人們的個人物品，避免了侵犯隱私，可知選D。 （3）考查推理判斷，根據(jù)第五段中的“In large public areas, it39。s hard to set up expensive screening equipment like what39。s in airports. Manpower is always needed to check bags and we want to develop a method to try to reduce manpower.”在大型公共場所，很難像機場那樣設(shè)置昂貴的安檢設(shè)施。檢查行李總是需要人力，我們希望開發(fā)一種互補的方法來減少人力，可推知選A。 （4）考查詞義猜測。根據(jù)最后一段中的“Future work will continue to focus on ameliorating the accuracy of identifying objects and imaging shapes and volumes”今后的工作將繼續(xù)側(cè)重于提高識別物體和成像形狀及體積的準(zhǔn)確性，故選B。 【點評】本題考點涉及細(xì)節(jié)理解，詞義猜測，推理判斷和段落大意四個題型的考查，是一篇科研類閱讀，要求考生在捕捉細(xì)節(jié)信息的基礎(chǔ)上，進一步根據(jù)上下文的邏輯關(guān)系，進行分析，推理，概括和歸納，從而選出正確答案。4．犇犇Choose the one that fits best according to the information given in the passage you have just read. Studies show that older people tend to remember the positive things in life rather than the negative things, while younger people remember the positive and negative equally well. The dominant psychological theory to explain this is that older people are aware of their limited time left, so they prioritize positive emotional experiences. But about a decade ago, I worked with biologist Robert Trivers on his idea that there was an evolutionary basis for older people39。s increased positive outlook. Our research took us in the fascinating direction of exploring how the body uses its energy. When our ancestors needed more energy than usual, perhaps while being chased by a tiger, they had to get that energy from somewhere in the body. Could they borrow it from the brain? That organ uses 20 percent of our metabolic (新陳代謝) output, whether we are solving math problems or watching television reruns. Due to this constant energy requirement, borrowing energy from the brain when our need surpasses the available supply is not an option. Perhaps we could borrow energy from our muscles. Because we use far more muscle energy when we are active than when at rest, in principle, we could borrow energy when we are sitting. But the problem is that most of the energydemanding emergencies of our ancestors required a muscular response. There was no way to borrow energy from our muscles during an emergency because relaxing when a tiger showed up was not an effective response. This brings us to our immune system, which, when strong, protects us from many illnesses and diseases. Like the brain, the immune system works at great metabolic cost, but largely in the service of keeping us healthy in the future. We have an enormous number of immune cells coursing through our body, a momentary break from production is fine. So, when our body needs extra energy, one of the places it goes is our immune function. When you39。re being chased by a tiger, you don39。t need to waste energy making immune cells to fight off tomorrow39。s cold. What you need is to shift all available energy resources to your legs, with the hope that you will live to experience another cough or sneeze. As a result, our immune system evolved to run in maximum amounts when we39。re happy, but to slow down dramatically when we39。re not. With this background in mind, Trivers supposed that older people evolved a strategy of turning this relationship on its head, being more focused on the positive things in life in an effort to enhance their immune functioning. This was helped along by their knowing much more about the world than younger adults, so they can deal with some of the unpleasant things in life more easily.（1）According to Robert Trivers, when our body needs extra energy, ______. A.muscles will respond to it by relaxing a little bitB.organs will speed up metabolic processes to answer itC.immune system will temporarily shut down to fulfill itD.brain will satisfy it by sharing optional metabolic output（2）In paragraph 3 this relationship most probably refers to the one between ______. A.experiences and related knowledgeB.happiness and biological evolutionC.immune function and healthD.optimism and length of life（3）What can be concluded from Robert Trivers39。 study? A.Younger people adopt strategies of handling tense situations from everyday life.B.Our ancestors evolved their immune systems in fighting against fierce animals.C.Realizing that their days are numbered, older people prefer being positive.D.Being negative drains energy from our body, lowering resistance to disease.（4）Which of the following is the best title of the passage? A.Brain, muscles and immune systemB.Age, health and happinessC.Ancestors, emergency and evolutionD.Energy, effort and response【答案】 （1）C（2）D（3）D（4）B 【解析】【分析】本文是一篇說明文，研究表明，老年人往往會記住生活中積極的事物，而不是消極的事物。十年前作者與生物學(xué)家羅伯特特里弗斯合作研究身體是如何使用能量的，他們的發(fā)現(xiàn)解釋了這一現(xiàn)象。 （1）考查推理判斷。根據(jù)第二段中的“We have an enormous number of immune cells coursing through our body, a momentary break from production