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题型:阅读理解-阅读单选 难度:0.65 引用次数:90 题号:21676372

Removing carbon dioxide from the atmosphere is essential to meeting international climate goals, scientists say. Without it, it’s all but impossible to reach net-zero greenhouse gas emissions in time to limit global warming to 1.5 or 2 degrees Celsius, the primary targets of the Paris climate agreement.

Yet carbon dioxide isn’t the only climate-warming gas that needs a sharp cutback in the atmosphere. Experts are turning their focus to methane (甲烷) as well.

On Tuesday and Wednesday, the National Academies of Sciences, Engineering and Medicine hosted a workshop dedicated to atmospheric methane removal, which is the process of removing methane emissions directly from the air. The workshop included presentations by dozens of researchers and policy experts addressing questions about the science and effectiveness of methane removal, potential side effects and unintended consequences and the ways it should be governed and regulated.

These presentations will be used to inform a forthcoming NASEM report on atmospheric methane removal. The study will examine the global need for methane removal, viable options for carrying it out and potential risks and benefits, while outlining a road map for future research. The subject is more complicated than carbon dioxide removal, which has received more attention and research.

Methane has a far shorter lifetime in the atmosphere than carbon dioxide, yet it’s a much more powerful greenhouse gas while it lasts. The world already has warmed by more than 1 degree Celsius since the Industrial Revolution, and scientists estimate that methane may be responsible for as much as 0.5 degrees.

Reducing methane emissions at their sources is a growing priority. However, Methane removal, by comparison, is more complex. For one thing, methane is far less abundant in the atmosphere than carbon dioxide, meaning methane capture systems must process much larger quantities of air in order to make a meaningful difference. For another, there are also uncertainties about unintended side effects of some emerging technologies. Adding chlorine (氯) to the atmosphere, for instance, can actually increase the lifetime of methane in the atmosphere if it isn’t carefully dosed. It can also attack the Earth’s protective ozone layer. Besides, chlorine-based methods could decrease certain other types of climate-warming gases in the atmosphere in addition to methane.

1. According to the passage, what is not the issue of the workshop?
A.The effectiveness of methane removal.B.The side effects of removing methane.
C.The predictable results of methane removal.D.The method of controlling methane removal.
2. What is the writing purpose of the 4th paragraph?
A.To persuade the readers to focus on the presentation.
B.To inform the readers of the significance of the study.
C.To call on the people to reduce the Methane emission.
D.To discuss about the problems that may arise from the removal.
3. Which of the following is not the reason why it is harder to remove methane than to remove carbon dioxide?
A.The carbon dioxide has a longer lifetime in atmosphere.
B.The methane is harder to be caught because of its traits.
C.Scientists have doubts about the effectiveness of the methods.
D.The new technologies may bring about the negative effects.
4. What can be a suitable title for the text?
A.The NASEM faces a great challengeB.The methane contributes to global warming
C.The government reports on methane removalD.The scientists explore pulling methane out of air

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【推荐1】Parents once shouted, “Don’t get dirty!”, as they angrily watched their children spoil their best clothes, their whites turning into brown before the day was over.

Today, many parents may secretly wish their children had the chance to pick up a bit of dirt. With the rise of urbanism (城市化), and exciting video games and social media, contact with nature is much rarer than in the past. For many, there is simply no chance to get muddy (沾满泥的). According to recent research, the dirt outside is teaming with friendly microorganisms that can train the immune system and build resistance (抵抗力) to many illnesses, including allergies, asthma and even depression and anxiety.

These findings show that outdoor exercise is not only beneficial because of the chance to wander free — but that certain natural materials, such as soil and mud, also contain surprisingly powerful microorganisms whose positive impact on children’s health we are only beginning to fully understand. Outdoor play can also offer valuable learning experiences. For example, the act of playing mud or sand can help children develop the way their senses and movement interact.

Such activities — away from the house or classroom— may also help children to find ways to deal with emotions that may be hard to explore in other environments. So-called “sand tray therapy”, which involves using sand and small statues to express one’s thoughts and feelings, is an accepted form of guidance for children who are struggling to express their emotional state.

Clearly, people who spent most their childhood in the countryside tend to show a better response to stressful events like public speaking compared with those who had grown up in cities. “The people who grew up in cities are kind of ‘walking time bombs’ when facing the stress we meet today. However, people since childhood who spent lots of time in nature are generally more positive.” says Christopher Lowry, a professor of integrative physiology.

1. How does the author introduce the topic?
A.By providing a research.B.By giving a definition.
C.By making a comparison.D.By answering a question.
2. Which of the following is NOT the benefit of outdoor exercise?
A.Improving the immune system.B.Expressing emotions in proper ways.
C.Gaining valuable learning experiences.D.Teaming with friendly microorganisms.
3. Why are some people “walking time bombs”?
A.Because they are harmful to the public.B.Because they are good at public speaking.
C.Because they are more easily hurt by stress.D.Because they always stay positive and energetic.
4. What message does the passage mainly convey?
A.Getting dirty?—Muddy puddles are actually good.
B.Outdoor activities are far more popular than before.
C.Children will have no stress if they live in the countryside.
D.Illnesses can be avoided if children are confident and positive.
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【推荐2】When families gather for Christmas dinner, some will stick to formal traditions dating back to grandma's generation. Their tables will be set with the good dishes and silver, and the dress code will be Sunday best.
But in many other homes, this china-and-silver elegance has given way to a stoneware (粗陶) and stainless informality, with dresses assuming an equally casual-Friday look. For hosts and guests, the change means greater simplicity and comfort. For makers of fine china in Britain, it spells economic hard times. Last week ______, the largest employer in Stoke-on-Trent, announced that it is eliminating 1,000 jobs -- one-fifth of its total workforce. That brings to more than 4, 000 the number of positions lost in 18 months in the pottery (陶瓷) region. Wedgwood and other pottery factories made cuts earlier.
Although a strong pound and weak markets in Asia play a role in the downsizing, the layoffs in Stoke have their roots in earthshaking social shifts. A spokesman for Royal Doulton admitted that the company "has been somewhat slow in catching up with the trend" toward casual dining. Families eat together less often, he explained, and more people eat alone, either because they are single or they eat in front of television. Even dinner parties, if they happen at all, have gone casual. In a time of long work hours and demanding family schedules, busy hosts insist, rightly, that it's better to share a takeout pizza on paper plates in the family room than to wait for the perfect moment or a "real" dinner party.
Too often, the perfect moment never comes. Iron a fine-patterned tablecloth? Forget it. Polish the silver? Who has time? Yet the loss of formality has its down side. The fine points of etiquette (礼节) that children might once have learned at the table by observation or instruction from parents and grandparents (" Chew with your mouth closed." "Keep your elbows off the table. ") must be picked up else-where. Some companies now offer etiquette seminars for employees who may be able professionally but inexperienced socially.
1. Why do people tend to follow the trend to casual dining?
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B.the worsening economy in Asia
C.the change in people's way of life
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【推荐3】What will man be like in 5,000 or even 50,000 year from now on? We can only make a guess, of course. However, we can be sure that he will greatly differ from what he is today.    1    

Let us take an obvious example. Man, even five hundred years ago, was shorter than he is today.    2     Five hundred years is a relatively short period of time, so we can imagine that man will continue to grow taller. Nowadays our eyes are in constant use. In fact, we use them so much that often they become weaker and we have to wear glasses. But over a very long period of time it is likely that man’s eyes will grow stronger.

On the other hand, we make less use of out* arms and legs.    3     We can’t walk farther. At the same time, however, our fingers will grow more sensitive because they are used a great deal in modern life. What about our brain? As time goes on, we shall have to use our brains more and more and eventually we shall need larger ones!    4     Our head, in particular the forehead, will larger.

Perhaps all this gives the impression that future man will not be a very attractive creature to look at! This may be true.    5     He will still be a human being with thoughts and emotions similar to our own.

A.For man is slowly changing all the time.
B.As a result, these are likely to grow weaker.
C.Man will live in the earth for a long time.
D.Now on average, man is about three inches taller.
E.This is likely to bring about a physical change, too.
F.What9s more, man is likely to have a wonderful life.
G.All in all, in spite of all these changes, future men will still have a lot in common with us.
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