【正文】 iridescence should be categorized as a camouflage strategy. And he wrote in his famous lifework Concealing173。catching colors could be used as a cover173。But iridescence also shows up in situations where reproduction is not an issue. So what we are studying now is whether natural selection imposed by predation(捕食行為) could explain the occurrence of iridescence in prey animals. s viewed, is favored by everything from birds to beetles and blossoms to butterflies. A good disguise keeps you hidden, right? Well, sometimes the best disguise is actually the most dazzling because research reveals that flashy metallic iridescence(金屬彩虹色) can visually puzzle predators, which allows colorful prey to survive another day. Those surprising results appear in the journal Scientific Reports. 【點評】本題考點涉及細節(jié)理解，推理判斷和主旨大意三個題型的考查，是一篇科研類閱讀，考生需要準確捕捉細節(jié)信息，同時根據(jù)上下文進行邏輯推理，概括歸納，從而選出正確答案。文章首句點明了文章談論中心：為什么隨著我們變老，我們會覺得時間過得更快？后面文章主要解釋了原因：老年人因為大腦退化，神經(jīng)元的變化導致他們覺得時間過得較快。故選B。當我們變老的時候，大腦需要更多的時間來處理信息。 （3）考查推理判斷。ve got your aging brain to blame.和第二段中的Over the years, these structures bee more plex and eventually begin to degrade.可知，隨著年齡的增長，不可避免的就是大腦結(jié)構(gòu)的老化。 （2）考查推理判斷。根據(jù)第一段中的 This is likely due largely to the physical changes of our nerves and neurons (神經(jīng)元).可知，老年人覺得時間過得過快的原因是神經(jīng)和神經(jīng)元的變化。The Function of the Brain【答案】 （1）A（2）B（3）B（4）C 【解析】【分析】本文是一篇說明文，介紹了為什么老年人會覺得時間過得較快，主要原因是隨著年齡的增長，大腦中神經(jīng)元的變化讓老年人的大腦需要更多的時間來處理接收到的信息，這樣就會讓他們覺得時間過得較快。Time Flies FastC.Little babies move their eyes much more often.（4）What is the best title of the text? A.The younger brain takes less time to process information.C.Less experience.（3）Why do the days seem longer earlier in life? A.More images.Aging brains.Longer days.The electrical signals.D.Changes of our nerves and neurons.B.re processing images at a faster rate, Beian says, For older people, this means fewer images are being processed in the same amount of time, causing experiences to seem as though they39。 The new finding put forward by a Duke University researcher was published in a paper in the journal European Review this week According to Adrian Bejan, the J. A Jones Professor of Mechanical Engineering at Duke, the physical changes of our nerves and neurons play, a major role in our perception (知覺) of time as we get old. Over the years these structures bee more plex and eventually begin to degrade.rapid fire39。 Why does time seem to fly by faster as we get old? You39。4．犇犇閱讀下列短文，從每題所給的A、B、C和D四個選項中，選出最佳選項。故選C。 （4）考查主旨大意。根據(jù)第三段中的The new material was lighter and... more likely to survive the Journey.可知A項和B項正確；以及After all, ... made the chalk powder easier to erase.可知C項正確；D項文章未提及。故選B。t draw the maps their teacher wanted on their tiny boards, so Pillans put several slates together to create a large board. ”在1800年，一名英格蘭校長James Pillans想讓他的學生們畫地圖，但是學生們在他們的迷你板上無法畫出地圖，因此校長讓學生把他們的迷你板拼湊在一起來制造一個大的板。根據(jù)第二段中的“故選D。 （1）考查細節(jié)理解。Function of the blackboard.【答案】 （1）D（2）B（3）D（4）C 【解析】【分析】本文是一篇說明文，通過描述黑板發(fā)展歷程向讀者介紹了黑板最早的時候確實是黑色的，隨后慢慢發(fā)展變成了綠色。Origin of the blackboard.C.s the main idea of the text? A.They39。They39。They39。They39。To arouse students39。To draw students39。To make a parison.B.D.C.B.t plaining either. After all, the new greenboards made the chalk powder easier to erase. Plus, the enamel left less of a glare and the color was nicer to look at. At that point, people started using the word chalkboard as a more accurate descriptor, but blackboard still stuck around.（1）What did the late 18thcentury students use in class? A.t draw the maps their teacher wanted on their tiny boards, so Pillans put several slates together to create a large board. Problem solved! From there, the idea spread quickly as teachers could finally show a concept to the whole class at one time. By 1815, the massive writing spaces were mon enough to earn their own name: blackboard.s up with the name? Originally, blackboards were really black. Before wallsized blackboards existed, late 18thcentury students used their own mini boards made of slate (石板) or painted wood, according to Concordia University, Those first boards were, in fact, black, and they paved the way for the larger ones. When you think back to the blackboard from your school days, what color is it? Chances are that it39。3．犇犇閱讀下列短文，從每題所給的A、B、C和D四個選項中，選出最佳選項。根據(jù)第一段中的“scientists have discovered that cooling may occur in areas where burnt trees allow more snow to mirror more sunlight into space.”可知從這個研究中得到的結(jié)論是B。故選B。 （4）考查推理判斷。 （3）考查細節(jié)理解。根據(jù)第四段中的“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.”可知地上的雪反射陽光這是大火的間接的影響，是在第二年春天的時候發(fā)生的事情，并不是immediate effects。故選A。 （1）考查細節(jié)理解。destroy large areas of forests and pollute the faroff sea iceD.warm the climate as the supposition goesB.D.createdB.releasedsuggest that people should take measures to protect the environmentD.analyze all aspects of how northern fires influence climateB.snow on the ground mirrors more sunlight back into spaceD.large amounts of greenhouse gases enter the atmosphereB.D.lead to a longer fire seasonB.result in a warming climate 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. This finding suggests that taking steps to prevent northern forest to limit the