【正文】 hat, if you swallow one accidentally, you can still breathe and won39。t choke to death. It39。s debatable whether that last one there is mon knowledge or not. A quick Google search of the fact, rewritten as a question, shows articles addressing this point going back several years, with the latest (re)appearing just this week over on ScienceAlert. We suppose it39。s one of those things that e up from time to time, like what would happen if you attack Yellowstone with a nuclear weapon (not much, as it turns out). If you jump over to Bic39。s website, under their FAQs (frequently asked questions), it quite clearly states: The reason that some BIC174。 pens have a hole in their cap is to prevent the cap from pletely obstructing the airway if accidentally breathed in. This is requested by the international safety standards ISO11540, except for in cases where the cap is considered too large to be a choking risk. That39。s rather lovely of them. In appreciation of their want to not kill off their more clumsy customers, we thought we39。d share a few more random facts about Bic that are probably going to e up in a pub quiz one day. Did you know, for example, that each Bic ballpoint pen can produce at least 2 kilometers ( miles) of ink before it begins to run out? In fact, in 2018, 7,250 kilometers (4,505 miles) of writing tests on such pens were carried out on ballpoint pens, gel pens(中性筆), and rollers to make sure they worked to the highest standard. The best part of the Bic site, however, is this rather curious fact: 100 percent of pen balls are made through a highlycontrolled process. As opposed to a highly uncontrolled process, involving explosions and bouncy castles and total chaos, we suppose.（1）Why does the author mention the case of Yellowstone? A.To list the facts.B.To prove his point.C.To pare the two situations.D.To emphasize the importance of safety.（2）What does the underlined word obstructing in paragraph 2 mean? A.Block.B.Open.C.Transform.D.Narrow.（3）Why were the writing tests on pens carried out? A.To work out their lifespan.B.To assure their good quality.C.To prove some random facts.D.To pare different pens with each other.（4）In what tone does the author develop the text? A.Critical.B.Acid.C.Humorous.D.Serious.【答案】 （1）B（2）A（3）B（4）C 【解析】【分析】本文是一篇說(shuō)明文，畢克筆的筆帽上有一個(gè)小孔是為了防止那些粗心的使用者不小心吞下而窒息死亡。這真是粗心使用者的生命通道。 （1）考查推理判斷。畢克筆的筆帽上留一個(gè)小孔的原因，且這個(gè)問(wèn)題會(huì)被偶爾問(wèn)到，就像如果你用核武器攻擊黃石公園會(huì)發(fā)生什么事這個(gè)問(wèn)題一樣，作者是在舉例證明他的觀點(diǎn)，故選B。 （2）考查詞義猜測(cè)。此處意為當(dāng)使用者不慎把筆帽吞下時(shí)，筆帽上的小孔就是為了阻止筆帽完全阻塞氣管而引起窒息，故選A。 （3）考查細(xì)節(jié)理解。根據(jù)第三段中的In fact, in 2018, 7,250 kilometers (4,505 miles) of writing tests on such pens were carried out on ballpoint pens, gel pens(中性筆), and rollers to make sure they worked to the highest standard.可知，舉行書(shū)寫(xiě)測(cè)試的目的是為了確保筆能夠達(dá)到最高的標(biāo)準(zhǔn)，故選B。 （4）考查推理判斷。根據(jù)第一段中的Some things should just be mon knowledge by now. The Earth isn39。t flat. Nope, your hair and nails don39。t grow after you die. 和第三段中的That39。s rather lovely of them. In appreciation of their want to not kill off their more clumsy customers等作者的行文措辭可知，作者筆調(diào)輕松幽默，故選C。 【點(diǎn)評(píng)】本題考點(diǎn)涉及細(xì)節(jié)理解，詞義猜測(cè)和推理判斷三個(gè)題型的考查，是一篇科普類(lèi)閱讀，考生需要準(zhǔn)確捕捉細(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 City trees grow faster and die younger than trees in rural forestry, a new study finds. Over 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）W