【正文】 r their lifetimes, then, urban trees will likely absorb less CO2 from the air than forest trees. As we all know, the earth would be freezing or burning hot without CO2. However, CO2 is a greenhouse gas, meaning it traps energy from the sun as/heat. That makes temperatures near the ground rise. Human activities, especially the widespread burningof fossil(化石)fuels, have been sending extra greenhouse gases into the air. This has led to a rise in average temperatures across the globe. Studies had shown forests readily absorb CO2, but there hadn39。t been much data on whether city trees grow, die and absorb CO2 at the same rate as forest trees do. So some researchers decided to find out. To figure out how quickly trees were growing, researchers tracked their diameters (the width of their trunks) between 2005 and 2014. A tree39。s diameter increases as it grows, just as a person39。s waist size increases as they gain weight. About half the weight of a tree is carbon, research has shown. Most of the rest is water. Over the nine years39。 tracking, the researchers found city trees absorbed four times as much carbon from the air as forest trees. However, they were twice as likely to die. So over the lifetime of each type of tree, forest trees actually absorbed more CO2. City trees grew faster because they had less petition for light from their neighbors. In a forest，trees tend to grow close together，shading their neighbors. Street trees also benefit from higher levels of nitrogen (氮)in rainwater. Nitrogen helps plants grow. Waste gases from gasburning cars also contain nitrogen, thus enriching city air with nitrogen. Later, rainwater may wash much of it to the ground. Some street trees may also have better access to water than trees in the country because the underground water pipes can leak.（1）What can he known about CO2 from paragraph 2? A.It is one of the side effects of greenhouses.B.It greatly accelerates the process of global warming.C.It results from the widespread burning of fossil fuels.D.It prevents the earth from being unsuitable to live on.（2）Why did researchers track the diameters of trees? A.To know about their growth rates.B.To find out how much they weigh.C.To check whether they were healthy.D.To assess the carbon amounts in them.（3）What advantage do city trees have over forest trees? A.They are more likely to access growth promoters.B.They can enjoy more water ing from the air.C.They can enjoy more shade from neighbors.D.They are better at peting for light.（4）What will probably be talked about if the passage is continued? A.How urban trees can live longer.B.Why city living makes trees die young.C.How trees respond to dry soil conditions.D.Why fastergrowing trees absorb more C02.【答案】 （1）D（2）A（3）A（4）B 【解析】【分析】本文是一篇說明文。一項(xiàng)新的研究發(fā)現(xiàn)：與長在森林中的樹木相比，城市里的樹木長得更快，但死得更早。 （1）考查推理判斷。根據(jù)第二段中的“the earth would be freezing or burning hot without CO2.”可知，如果沒有二氧化碳，地球?qū)O冷或極熱?？梢酝茢?，二氧化碳可以防止地球變得不適合居住。故選D。 （2）考查細(xì)節(jié)理解。根據(jù)第四段中的“To figure on how quickly trees were growing, researchers tracked their diameters.”可知，研究人員監(jiān)測樹木的直徑是為了了解樹木的生長速度。故選A。 （3）考查細(xì)節(jié)理解。根據(jù)最后一段中的“Street trees also benefit from higher levels of nitrogen (氮）in rainwater. Nitrogen helps plants grow. Waste gases from gasburning cars also contain nitrogen, thus enriching city air with nitrogen. Later, rainwater may wash much of it to the ground.”可知，與生長在森林中的樹木相比，城市里的樹木長得更快是因?yàn)樗鼈儫o需與鄰近的樹木爭奪光照，也能得到更多的氮量，還更容易得到水。光、氮和水都可以促進(jìn)樹木的生長。由此可以推斷，城市里的樹木比森林中的樹木更可能獲得生長促進(jìn)劑。故選A。 （4）考查推理判斷。首句就提到了一項(xiàng)新的研究結(jié)果：城市里的樹木比森林中的樹木長得更快，但死得更早；文章第三段說到“以前有研究表明森林會吸收二氧化碳，但是城市里的樹木的生長、死亡和吸收二氧化碳的速度是否跟森林中的樹木一樣，這方面的數(shù)據(jù)不多。因此一些研究人員決定弄清楚”；文章第四段再次介紹了他們的研究發(fā)現(xiàn)：城市里的樹木比森林中的樹木長得更快，但死得更早；文章最后一段介紹了城市里的樹木比森林中的樹木生長得更快的幾個(gè)原因。由此可以推斷，文章接下來很可能就要介紹城市里的樹木死得更早的原因。故選B。 【點(diǎn)評】本題考點(diǎn)涉及細(xì)節(jié)理解和推理判斷兩個(gè)題型的考查，是一篇科研類閱讀，考生需要準(zhǔn)確掌握細(xì)節(jié)信息，并根據(jù)上下文進(jìn)行邏輯推理，從而選出正確答案。8．閱讀理解 What a Messy Desk Says About You For some time, psychologists have been studying how personality traits affect health and healthrelated choices. Not surprisingly, they have found that people blessed with innate conscientiousness, meaning that they are organized and predictable, typically eat better and live longer than people who are disorderly. They also tend to have immaculate offices. What has been less clear is whether neat environments can produce good habits even in those who aren39。t necessarily innately conscientious. To find out, researchers at the University of Minnesota conducted a series of experiments. In the first experiment, they randomly assigned a group of collegeage students to spend time in two office spaces, one of which was very neat, the other wildly cluttered (亂堆) with papers and other workrelated stuff. The students spent their time filling out questionnaires unrelated to the study. After 10 minutes, they were told they could leave with an apple or a chocolate bar. Those students who sat in the orderly office were twice as likely to choose the apple as those who sat among the mess. A second experiment, however, found that working in chaos has its advantages, too. In this one, college students were placed in a messy or a neat office and asked to dream up new uses for PingPong balls. Those in messy spaces generated ideas that were significantly more creative, according to two independent judges, than those in offices where stacks of papers and other objects were neatly arranged. The results were something of a surprise, says Dr. Vohs, the leader of the study. Few previous studies found much virtue in disorder. The broken window theory, proposed decades ago, holds that even slight disorder and neglect can encourage indifference and poor discipline. But in the study by Dr. Vohs, disordered offices encouraged originality and a search for novelty. In the final portion of the study, adults were given the choice of adding a health boost to their lunchtime smoothie that was labeled either new or classic. The volunteers in the messy space were far more likely to choose the new one。 those in the tidy office generally chose the classic version. Disorderly environments seem to inspire breaking free of tradition, Dr. Vohs and