首页
登录
职称英语
In the atmosphere, carbon dioxide acts rather like a one-way mirror—the glas
In the atmosphere, carbon dioxide acts rather like a one-way mirror—the glas
游客
2023-09-11
22
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 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 inenia (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. [br] The article was written to explain______.
选项
A、the greenhouse effect
B、the solar effects on the earth
C、the greenhouse effect
D、the causes affecting weather
答案
D
解析
通过全文的阅读我们可以得知,本文的写作目的是为了揭示天气变化的原因。
转载请注明原文地址:https://tihaiku.com/zcyy/3004548.html
相关试题推荐
Doyouseetheglassashalf-fullratherthanhalfempty?Doyoukeepyoure
Doyouseetheglassashalf-fullratherthanhalfempty?Doyoukeepyoure
Infact,PeterwouldratherhaveleftforSanFrancisco______(而不愿呆在纽约).thans
Intheatmosphere,carbondioxideactsratherlikeaonewaymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaonewaymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
WhydoestileFoundationconcentrateitssupportonbasicratherthanapplie
WhydoestileFoundationconcentrateitssupportonbasicratherthanapplie
随机试题
[originaltext]RobertBrucewasafamousScottishgeneral.Intheearlyfour
Undergraduatestudentshaveno________totherarebooksintheschoollibrary.
[originaltext]IsthisyourfirsttimetocometoBeijing?[/originaltext][origi
针对评价细集料洁净程度的相关试验,回答下列问题;2).细集料的砂当量和亚甲蓝值的
肾病治疗首选()A.激素 B.环磷酰胺 C.利尿剂 D.降压药
下列各项中,可以证实市场不是半强式有效市场的有( ) Ⅰ股票分割消息宣布后不
Theworkersfinallycalledoffthestrik
以下哪项是助流剂的主要作用A.改善力的传递与分布 B.增加颗粒间的摩擦力 C
以下说法中错误的是()。A:证券公司子公司可以直接或者间接持有其母公司的股权B
某资产管理机构发行了一款保本型股指联结票据,产品的主要条款如表7—7所示。根据主
最新回复
(
0
)