【正文】 rgencies 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。 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。 【點(diǎn)評(píng)】本題考點(diǎn)涉及細(xì)節(jié)理解，詞義猜測(cè)，推理判斷和段落大意四個(gè)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(jìn)一步根據(jù)上下文的邏輯關(guān)系，進(jìn)行分析，推理，概括和歸納，從而選出正確答案。在大型公共場(chǎng)所，很難像機(jī)場(chǎng)那樣設(shè)置昂貴的安檢設(shè)施。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(gè)人物品，避免了侵犯隱私，可知選D。 （1）考查段落大意。B.Confirming.To make full use of WiFi.C.It protects personal information from being disturbed.（3）Why did the researchers study the device according to Yingying Chen? A.It saves people in danger of natural disasters.B.B. The peerreviewed study, which recently won a best paper award at the 2018 IEEE Conference on Communications and Network Security, is now published online. Future work will continue to focus on ameliorating the accuracy of identifying objects and imaging shapes and volumes, researchers said.（1）What does paragraph 3 talk about? A.s hard to set up expensive screening equipment like what39。 The detection system analyzes what happens when wireless signals go through and bounce off objects or materials. The approach, which the paper states, works by separating the wireless interference(干擾)caused by two factors of objectsthe material and shape. Most dangerous objects such as weapons are usually metal or liquid, which have significant interference, researchers said.”可知，作者接下來(lái)可能會(huì)告訴我們“如何全面擴(kuò)大5G覆蓋。t get too excited. There39?！?可知，我們可以從文中推斷，科技公司將面臨智能手機(jī)可能被取代的事實(shí)。根據(jù)第二段中的“and that is to say, it is a sign of tim”也就是說(shuō)，這是時(shí)間的標(biāo)志，”可知，劃線詞的意思是“標(biāo)志，象征”。re moving closer and closer to 5G world.”緩慢但肯定的是，我們離5G世界越來(lái)越近了。t concentrated in big cities.D.Tech panies will face the fact that smartphones may be replaced（4）What will the author probably tell us next? A.5G world won39。B.Exhibition.The lightingfast speed of 5G.B. But don39。 Ericsson stated at February39。 Augmented reality glasses and virtual headset haven39。s pulling in data from other vehicles about road conditions down the lane. It could be weather information, but also connected infrastructure (基礎(chǔ)設(shè)施) construction. There39。re moving closer and closer to 5G world. From smarthome security to selfdriving cars, all the internetconnected devices in your life will be able to talk to each other at lightningfast speeds with reduced delay, Objectively speaking, the fastest 4G download speeds in the U. S. top out at an average of Mbps. But by parison 5G promises gigabit (千兆) speeds. （5）考查細(xì)節(jié)理解。根據(jù)第三段中的“Earlier studies by other scientists have suggested that fire in northern regions speed up climate warming because greenhouse gases from burning trees and plants are released into the atmosphere and thus trap heat.”可知早期關(guān)于北方森林火災(zāi)的研究建議大火將加速氣候變暖，故選D。 （2）考查推理判斷。help to gain more energy rather than release more energy【答案】 （1）A（2）C（3）D（4）B（5）B 【解析】【分析】本文是一篇說(shuō)明文，介紹了阿拉斯加、加拿大和西伯利亞的森林大火使氣候變暖，科學(xué)家們已經(jīng)發(fā)現(xiàn)，在燃燒的樹木允許更多的雪將更多的陽(yáng)光反射到太空的地區(qū)可能會(huì)發(fā)生冷卻。distributed（5）From the passage we can draw a conclusion that forest fires in Alaska, Canada and Siberia may ________. A.C.indicate that forest fires will pollute the atmosphereC.the levels of ozone which is a type of oxygen increaseC.cause the forest fires to occur more frequentlyC. This is the first study to analyze all aspects of how northern fires influence climate. Earlier studies by other scientists have suggested that fire in northern regions speed up climate warming because greenhouse gases from burning trees and plants are released into the atmosphere and thus trap heat. Scientists found that right after the fire, large amounts of greenhouse gases entered the atmosphere and caused warming. Ozone (臭氧) levels increased, and ash from the fire fell on faroff sea ice, darkening the surface and causing more radiation from the sun to be taken in. The following spring, however, the land within the area of the fire was brighter than before the fire, because fewer trees covered the ground. Snow on the ground mirrored more sunlight back into space, leading to cooling.result in a warming climateB.large amounts of greenhouse gases enter the atmosphereB.analyze all aspects of how northern fires influence climateB.releasedD.destroy large areas of forests and pollute the faroff sea iceD.故選A。 （3）考查細(xì)節(jié)理解。故選B。2．犇犇閱讀理解 we39。 “5G is one of those signs, along with artificial intelligence, of this ing data age,” said Steve Koenig, senior director of market research for the Consumer Technology Association. “The selfdriving vehicle is a great emblem of this data age, and that is to say, it is a sign of time, because with one single task, driving, you have massive amounts of data ing from the vehicle itself, and a variety of sensors are collecting a lot of information to model its environment as it moves. It39。t concentrated only in big cities.（1）What d