首页
登录
职称英语
In the atmosphere, carbon dioxide acts rather like a one-way mirror—the gla
In the atmosphere, carbon dioxide acts rather like a one-way mirror—the gla
游客
2023-09-08
63
管理
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. [br] Although the fuel consumption is greater in the northern hemisphere, temperatures there seem to be falling. This is ______.
选项
A、mainly because the levels of carbon dioxide are rising
B、possibly because the ice caps in the poles are melting
C、exclusively due to the effect of the inertia of the earth’s climate
D、partly due to variations in the output of solar energy
答案
D
解析
细节题。文章第三段提及这一现象时讲到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? (科学家们认为:这一现象的产生是因为到目前为止自然界对天气的影响要大于人类对天气的影响。而究竟是哪
转载请注明原文地址:https://tihaiku.com/zcyy/2995890.html
相关试题推荐
Doyouseetheglassashalf-fullratherthanhalfempty?Doyoukeepyoure
Doyouseetheglassashalf-fullratherthanhalfempty?Doyoukeepyoure
Doyouseetheglassashalf-fullratherthanhalfempty?Doyoukeepyoure
Infact,PeterwouldratherhaveleftforSanFrancisco______(而不愿呆在纽约).thans
Intheatmosphere,carbondioxideactsratherlikeaonewaymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
WhydoestileFoundationconcentrateitssupportonbasicratherthanapplie
WhydoestileFoundationconcentrateitssupportonbasicratherthanapplie
随机试题
TheIntergovernmentalPanelonClimateChange(IPCC)wassetupin1988toa
[originaltext]Fromthislookoutweenjoyoneofthemostspectacularviewso
混凝土配合比是指混凝土中水泥、水、砂及石子四种材料之间的三个对比关系,包括(
根据《民用建筑节能设计标准》(JGJ26-95)的规定,建筑物南向的窗墙面积比(
下列分子中偶极矩不等于零的是()。A. B. C. D.
下列关于合同的订立的说法中,错误的是()。A.当事人订立合同,应当具有相应的民
唾液可以( )。A.引起味觉 B.为以后的消化吸收做准备 C.保护口腔
必须按照国务院卫生行政部门的有关规定,严格执行消毒隔离制度,防止发生医院内感染和
抽样误差的大小取决于以下因素()。A.总体内部的差异程度 B.样本容量的大小
(2014年真题)甲公司是C国一家生产经营消费类电子产品的企业,准备到发展中
最新回复
(
0
)