【正文】 d small, however, respond to even slight changes in oxygen by seeking refuge in higher oxygen zones or by adjusting behavior, Oschlies and others in his field have found. These adjustments can expose animals to new predators or force them into foodscarce regions. Climate change already poses serious problems for marine life, such as ocean acidification, but deoxygenation is the most pressing issue facing sea animals today, Oschlies says. After all, he says, they all have to breathe. In the past decade ocean oxygen levels have taken a dive—an alarming trend that is linked to climate change, says Andreas Oschlies, an oceanographer at the Helmholtz Center for Ocean Research in Germany, whose team tracks ocean oxygen levels worldwide. We were surprised by the intensity of the changes we saw, how rapidly oxygen is going down in the ocean and how large the effects on marine ecosystems are, he says. It is no surprise to scientists that warming oceans are losing oxygen, but the scale of the drop calls for urgent attention. Oxygen levels in some tropical (熱帶的) regions have dropped by an astonishing 40 percent in the last 50 years, some recent studies reveal. Levels have dropped less significantly elsewhere, with an average loss of 2 percent globally.5．犇犇Choose the one that fits best according to the information given in the passage you have just read. 作者開頭提出老年人更關(guān)注積極的事情，后文提到積極的情緒會增強(qiáng)免疫系統(tǒng)，所以本文主要講的是年齡，健康與積極的情緒之間的關(guān)系，選B。選D。re not.可知當(dāng)我們快樂時，我們的免疫系統(tǒng)進(jìn)化到最大程度，但是當(dāng)我們不快樂時，免疫系統(tǒng)會減弱。根據(jù)最后一段中的As a result, our immune system evolved to run in maximum amounts when we39。也就是說積極與免疫功能之間有關(guān)系，越積極，免疫功能越強(qiáng)，就能活得越久，所有選項中D項（樂觀與壽命）之間最切題，故選D。 （2）考查詞義猜測。由此可以推斷，免疫系統(tǒng)會暫時停止來為身體提供額外的能量。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 is fine. So, when our body needs extra energy, one of the places it goes is our immune function.”可知我們的身體里有大量的免疫細(xì)胞，暫時停止運(yùn)作是可以的。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。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。Ancestors, emergency and evolutionB.Brain, muscles and immune systemRealizing that their days are numbered, older people prefer being positive.D.Younger people adopt strategies of handling tense situations from everyday life.B.optimism and length of life（3）What can be concluded from Robert Trivers39。happiness and biological evolutionC.experiences and related knowledgeimmune system will temporarily shut down to fulfill itD.muscles will respond to it by relaxing a little bitB.re happy, but to slow down dramatically when we39。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.re being chased by a tiger, you don39。s increased positive outlook. Our research took us in the fascinating direction of exploring how the body uses its energy.4．犇犇Choose the one that fits best according to the information given in the passage you have just read. 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。檢查行李總是需要人力，我們希望開發(fā)一種互補(bǔ)的方法來減少人力，可推知選A。s in airports. Manpower is always needed to check bags and we want to develop a method to try to reduce manpower.” （3）考查推理判斷，根據(jù)第五段中的“In large public areas, it39。 （2）考查細(xì)節(jié)理解。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。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。C.Improving.To research dangerous objects.（4）Which of the following can replace the underlined word “ameliorating in the last paragraph? A.To protect passengers39。B.To save money and labour. signals.D.It passes through bags without damaging them.C.s the advantage of the device? A.D.The way the device works.C.The function of the technique.s in airports. Manpower is always needed to check bags and we want to develop a method to try to reduce manpower.”s a growing need for that now. In large public areas, it39。 When it was tested on a backpack, the accuracy rate topped 95 percent. But the accuracy dropped to about 90 percent when objects inside bags are wrapped. And the tech could save lives if used in museums, stadiums, theme parks or schools, the team said, noting its design can inspect bags or luggage without being an exposure to privacy. Research suggested that WiFi can now be used to estimate the volume of liquids such as water, acid, alcohol and other chemicals for explosive material. The study led by researchers at the Wireless Information Network Laboratory (WINLAB) in the School. of Engineering showed a wireless device with two to three antennas(天線)that could be fitted in existing WiFi networks.3．犇犇閱讀理解C項正好與主旨句呼應(yīng)，故選C。 （4）考查主旨大意。所以說，相較于老年人，年輕人的大腦花費(fèi)更少的時間來處理信息。根據(jù)第一段中的最后兩句可知，年輕時之所以覺得日子似乎更長是因為大腦能夠以“快速射擊”的方式處理更多信息。故選B。根據(jù)第一段中的You39。故選A。 （1）考查細(xì)節(jié)理解。The Older, the FasterD.Nerves and NeuronsB.Old people have fewer things to do than young people.D.Young people are more energetic in their life.B.D.C.B.Rapid fire abilities.（2）What is unavoidable in the process of getting old? A.Information in our brain.C.re happening more quickly.（1）What causes time to fly faster as we get old? A. Little babies, for example, move their eyes much more often than adults because they39。 abilities of the young brain allow us to process more information during youth, causing the days to seem longer earlier in life. However, as we get old, researchers say the older brain takes more time to process information.ve got your aging brain to blame. This is likely due largely to the physical changes of our nerves and neurons (神經(jīng)元). New res