首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
In the atmosphere, carbon dioxide acts rather like a one-way mirror—the glass in the roof of a greenhouse which allows the sun’s
In the atmosphere, carbon dioxide acts rather like a one-way mirror—the glass in the roof of a greenhouse which allows the sun’s
admin
2013-07-01
37
问题
In the atmosphere, carbon dioxide acts rather like a one-way mirror—the glass in the roof of a greenhouse which allows the sun’s rays to enter but prevents the heat from escaping. According to a weather expert’s prediction)the atmosphere will be 3℃ warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate. If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several meters and severely flooding coastal cities. Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere, possibly resulting in an alteration of the chief food-growing zones.
In the past, concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet. But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of warming: in other words, by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels. Satellite pictures show that large areas of Antarctic ice are already disappearing. The evidence available suggests that a warming has taken place. This fits the theory that carbon dioxide warms the earth.
However, most of the fuel is burnt in the northern hemisphere, where temperatures seem to be falling. Scientists conclude, therefore, that up to now natural influences on the weather have exceeded those caused by man. The question is: Which natural cause has the most effect on the weather?
One possibility is the variable behavior of the sun. - Astronomers at one research station have studied the hot spots and "cold" spots(that is, the relatively less hot spots)on the sun. As the sun rotates, every 27. 5 days, it presents hotter or colder faces to the earth, and different aspects to different parts of the earth. This seems to have a considerable effect on the distribution of the earth’s atmospheric pressure, and consequently on wind circulation. The sun is also variable over a long term; its heat output goes up and down in cycles, the latest trend being downward.
Scientists are now finding mutual relations between models or solar-weather interactions and the actual climate over many thousands of years, including the last Ice Age. The problem is that the models are predicting that the world should be entering a new Ice Age and it is not. One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia of the earth’s climate. If this is right, the warming effect of carbon dioxide might thus be serving as a useful counter-balance to the sun’s diminishing heat.
The article was written to explain______.
选项
A、the greenhouse effect
B、the solar effects on the earth
C、the models of solar weather interactions
D、the causes affecting weather
答案
D
解析
主旨题。全文讲述的是影响天气的诸多原因。A选项是温室效应,B选项是太阳对地球的影响,C选项是太阳与天气之间的相互影响。这三个选项在文中均被提及但不足以概括全文的主旨,只有D影响天气的诸多原因是比较全面的。因此,答案是D。
转载请注明原文地址:https://kaotiyun.com/show/Nfn7777K
0
大学英语六级
相关试题推荐
Agoodmarriagemeansgrowingasacouplebutalsogrowingasindividuals.Thisisn’teasy;marriagehasalwaysbeendifficult.
A、Avisittoaprison.B、Theinfluenceofhisfather.C、Atalkwithsomemiserableslaves.D、HisexperienceinthewarbetweenF
A、Apetdog.B、Thesonofthecouple.C、Apetcat.D、Theman’syoungerbrother.B本题问“根据对话内容,Max可能是谁”。文中提到的“grandmother”表明Max是这对夫
A、$9.B、$18.C、$12.D、$36.C综合推断题。男士说这个包18美元,女士说这个价格比两个月前涨了一半,由此可知,现在的价格是两个月前的1.5倍,所以C正确。
A、It’ssimilartoplayingnotesonapiano.B、Itrequiresanight’ssleep.C、It’ssimilartothewayacomputerstoresinformati
A、Skeptical.B、Optimistic.C、Indifferent.D、Realistic.B录音结尾部分提到,经济萧条给Andrea带来了比她料想中更多的问题,但是她一直保持着乐观的心态,故B正确。
A、Joiningaclub.B、Usingatimer.C、Puttingthecomputerinthelivingroom.D、Notspendinghoursuninterruptedly.A
A、Athome.B、Inapark.C、Inacafe.D、Inafriend’shouse.CWhenthefirstearthquakestarted,wherewasthewoman?
Basicprofilingisawidelyusedinvestigatingtool,buttherearecontradictoryattitudestowardsit.Whetheraprofileissup
ThenoiseofaleafblowerislouderinAmericathanthatinNewZealand.Hypertensioncanbecausedbythenoiselowerthan65
随机试题
唐先生到医院看望患性病住院的妻子,乘电梯时,唐先生听到两名护士在谈论他妻子的病情。护士们在乘电梯时谈论唐先生妻子的病情,其侵犯的权利是()
对于初诊需明确甲亢诊断的患者,以下组合最合理的是
下列哪项牙槽骨的生物学特性是错误的
下列各项,不属导致崩漏常见病因的是
砖墙砌筑的基本要求包括下列的()。
货币政策工具对货币供应量的影响表现在()。
配送功能要素中的“时间”是指配送的在途时间,不包括装卸搬运时间。()
发展中国家人的锌缺乏症情况比发达国家严重。()
设函数f(x)=x+aln(1+x)+bxsinx,g(x)=kx3,若f(x)与g(x)在x→0是等价无穷小,求a,b,k的值。
S省省委党校在青干班和省直处长班教育中推出了全新课程——党性廉政教育,排出廉政课程表,通过领导讲解政策、监狱体验式教学等方式,让学员对廉政有了更深刻的认识。有学员表示,一开始没注意到廉政课程表,上过课之后才知道好,很有感触。党校教授讲了三个故事,
最新回复
(
0
)