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
2017-02-01
71
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 31 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 earth’s 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 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 of 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(惯性)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
文章前半部分(前四段)讲燃烧产生二氧化碳使地球产生温室效应,后半部分(后三段)讲太阳对地球的影响使地球温度降低。尤其值得注意的是第5段提出的问题Which natural cause has most effect on the weather?使我们推断出本文旨在解释影响气候变化的原因。故D项为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/wEU7777K
0
大学英语六级
相关试题推荐
Afterdecadesofdecline,theshareofmotherswhostayhomewiththeirchildrenhas【C1】______risenoverthelastseveralyears,
Afterdecadesofdecline,theshareofmotherswhostayhomewiththeirchildrenhas【C1】______risenoverthelastseveralyears,
TowardstheendofJune,auniquejointexpeditionbeganinthewatersnearIndonesia.Inanareaofremarkablemarinediversity
TowardstheendofJune,auniquejointexpeditionbeganinthewatersnearIndonesia.Inanareaofremarkablemarinediversity
TowardstheendofJune,auniquejointexpeditionbeganinthewatersnearIndonesia.Inanareaofremarkablemarinediversity
A、Ratherdifficulttoplease.B、Rudetowomendrivers.C、Talkativeandgenerouswithtips.D、Differentinpersonality.D对话中女士说喜欢
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofraysfromthesunandotherstars.Theatmosphere
A、Stomachcancer.B、Skincancer.C、Lungcancer.D、Bloodcancer.AA是老师提到阳光可以防御癌症后列举的例子之一。B是曝晒导致的。
A、Lackofvitaminsisthemaincauseofskincancer.B、Newresearchprovesthatsunbathingcausesnoproblemsatall.C、Thedang
随机试题
实践是检验真理的唯一标准,这主要是因为()
患儿,7岁。急性肾炎,血压140/100mmHg(19/13kPa),水肿重,尿量明显减少,呼吸困难不能平卧,心率:140次/分,心音低钝,肝肋下2cm,X线胸片:肺纹理增强。该患儿可能出现
作用于二氢叶酸还原酶的药物有
广义的土地资源包括()等资源。
下列影响该地铁项目目标实现的因素中,决定性的因素是( )。甲公司用新型施工机械替换原有施工机械的作法,属于项目目标动态控制纠偏措施中的( )。
背景资料: 某梁式桥,上部构造为11孔22m无横隔板装配式钢筋混凝土T梁,横向五根梁,下部构造桥墩为单排4根直径80cm钻孔灌注桩基础,双柱式钢筋混凝土墩身,桥台为5根断面为30cm×30cm的钢筋混凝土打入桩加盖梁组成。 问题:该桥梁总体质
下列不属于有关技术分析常划分的缺口的是( )。
公路:交通
()是先进生产力和先进文化的创造主体。
山奇是一种有降血脂特效的野花,它数量特别稀少,正濒临灭绝。但是,山奇可以通过和雏菊的花粉自然杂交产生山奇一雏菊杂交种子。因此,在山奇尚存的地域内应当大量地人工培育雏菊,虽然这种杂交品种会失去父本或母本的一些重要特性,例如不再具有降血脂的特效,但这是避免山奇
最新回复
(
0
)