【文章內容簡介】 的You39。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構的老化。故選B。 （3）考查推理判斷。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。當我們變老的時候，大腦需要更多的時間來處理信息。所以說，相較于老年人，年輕人的大腦花費更少的時間來處理信息。故選B。 （4）考查主旨大意。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。C項正好與主旨句呼應，故選C。 【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。4．犇犇閱讀理解 A single dose(劑量) of an experimental vaccine(疫苗) can protect mice against the Zika(寨卡) virus, raising renewed hope of a vaccine for humans, say scientists. The US team say the results, published in Nature, are striking and should encourage research efforts. Tests in humans could begin in months. But even if these go well, a licensed vaccine for widespread use to protect those at most risk 173。 such as pregnant women 173。 would still be years away, experts advise. Zika has been spreading across Central and South America and, most recently, Africa. More than 60 countries and territories now have continuing transmission(傳播) of the disease, which is carried by mosquitoes. The virus causes serious birth damages during pregnancy and has been declared a global public health emergency. Now, developing a vaccine for pregnant women to protect their unborn babies is an international research priority(優(yōu)先事項). US scientists from the Walter Reed Army Institute of Research, the Beth Israel Deaconess Medical Center and Harvard Medical School tested two types of Zika vaccine in mice – one based on bits of genetic(基因的) code from the virus and another that is an inactive (and therefore harmless) copy of Zika. Both worked well, protecting every mouse that was immunised against the virus. In parison, all of the mice not given the vaccine caught Zika after they were exposed to it. Researchers say they will push ahead with developing the needed virus vaccine. There are many existing vaccines for other disease that use this type of technology, while there are relatively few DNA173。based vaccines. Of course, future tests will need to check the vaccine is safe and effective in humans, as well as how long the immunity might last.（1）If the tests in humans go smoothly, . A.a vaccine for use in the laboratory will be still be years away.B.pregnant women in Africa will be the first to benefit from the vaccine.C.a licensed vaccine will still not be accessible in a short term.D.The Zika virus will cause less serious birth defects during pregnancy in months.（2）Which of the following statements is NOT true? A.many countries are actively involved in the research of the Zika vaccine.B.US scientists have tested more than two types of Zika vaccine in mice.C.None of the mice given the vaccine caught Zika.D.It is still unknown whether the vaccine is safe and effective.（3）Which can be the best title for the passage? A.Zika vaccine 39。works very well39。 in miceB.Zika vaccine still has a long way to goC.International researches into Zika have paid offD.More attention has been paid to Zika vaccine【答案】 （1）C（2）B（3）A 【解析】【分析】本文是一篇說明文，介紹了科學家發(fā)現(xiàn)一種實驗性疫苗可以保護小鼠免受寨卡病毒侵襲。 （1）考查細節(jié)理解。根據(jù)第二段中的But even if these go well, a licensed vaccine for widespread use to protect those at most risk 173。 such as pregnant women 173。 would still be years away可知，但是，即使這些進展順利，一種廣泛用于保護高危人群的授權疫苗仍需數(shù)年時間，也就是說如果人體試驗進展順利的話，短期內仍無法獲得授權疫苗，故選C。 （2）考查細節(jié)理解。根據(jù)第三段中的US scientists from the Walter Reed Army Institute of Research, the Beth Israel Deaconess Medical Center and Harvard Medical School tested two types of Zika vaccine in mice可知，美國科學家在白鼠身上只測試了兩種而不是兩種以上的寨卡病毒，故選B。 （3）考查主旨大意。根據(jù)第一段中的A single dose(劑量) of an experimental vaccine(疫苗) can protect mice against the Zika(寨卡) virus,可知，一種實驗性疫苗可以保護小鼠免受寨卡病毒侵襲，由此可知，本文主要介紹的是寨卡病毒疫苗對小白鼠非常有效，故選A。 【點評】本題考點涉及細節(jié)理解和主旨大意兩個題型的考查，是一篇科研類閱讀，考生需要準確掌握細節(jié)信息，同時根據(jù)上下文進行推理，歸納，從而選出正確答案。5．犇犇閱讀理解 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. Shining iridescent color, which changes depending on the angle from which it39。s viewed, is favored by everything from birds to beetles and blossoms to butterflies. And in our research group we are of course interested in why this vivid metallic color is so widespread in nature. Karin Kjernsmo of the University of Bristol adds that in some cases the showy splashes of light are a sexual strategy. Here I would like to point out that in some species, particularly those that display strong sexual dimorphism(雌雄兩性), such as birds of paradise or some butterflies or fishes, the occurrence of iridescence is most likely driven by sexual selection. For example, in many of these cases it is the males that have these vivid iridescent colors and they use them in mate choice or they use them as a signal to attract mates. 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. The idea that eye173。catching colors could be used as a cover173。up isn39。t a new one. The father of camouflage theory, Abbott Thayer, really believed that iridescence should be categorized as a camouflage strategy. And he wrote in his famous lifework Concealing173。Coloration in the Animal Kingdom, already in 1909, that 39。brilliantly changeable or metallic colors are among the strongest factors in an animal39。s concealment39。. And this sounds like a pletely unreasonable thing to say, because how can colors that are both brilliant and changeable contribute to animal39。s concealment？ In a similar way, we were asking whether iridescence, due to its changeability, could work as a form of camouflage by preventing shape recognition. Kjernsmo and her colleagues trained bumblebees to associate a particular shape—a circle or an oval—with a sugar reward. And they found that the bees, when given a choice, would preferentially visit the shape they