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 su
In the atmosphere, carbon dioxide acts rather like a one-way mirror -- the glass in the roof of a greenhouse which allows the su
admin
2010-07-06
5
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~C 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 metres 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 relation 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 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.
It can be concluded that a concentration of carbon dioxide in the atmosphere would ______.
选项
A、prevent the sun’s rays from reaching the earth’s surface
B、mean a warming up in the Arctic
C、account for great changes in the climate in the northern hemisphere
D、raise the temperature of the earth’s surface
答案
D
解析
第一段中提到,大气中的二氧化碳就像温室的屋顶,它让阳光只能进去而热量不能出来。可见,二氧化碳可以提高地球表面的温度。
转载请注明原文地址:https://kaotiyun.com/show/4VDd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Ialwayseatbreakfast,andsuggestthatyoudotoo.Weallneedfoodinthemorningtosupplyourselves【C1】________sourcesofg
Ialwayseatbreakfast,andsuggestthatyoudotoo.Weallneedfoodinthemorningtosupplyourselves【C1】________sourcesofg
ThepagesoftheHarvardBusinessReviewarenotusuallypopulatedbynovelists.ButJosephFinderisjustsuchararity.Recent
ThepagesoftheHarvardBusinessReviewarenotusuallypopulatedbynovelists.ButJosephFinderisjustsuchararity.Recent
ThedailycirculationoftheDailyMirrorandtheDailyExpressis______.
ThedailycirculationoftheDailyMirrorandtheDailyExpressis______.
Whilefashionisthoughtofusuallyinrelationtoclothing,itisimportanttorealizethatitcoversamuchwiderdomain.Iti
Whilefashionisthoughtofusuallyinrelationtoclothing,itisimportanttorealizethatitcoversamuchwiderdomain.Iti
Researcherssaidthatchildrendonotnecessarilydevelophealthybonesinareportthatstresses______consumptionofcalcium-
随机试题
A.保和丸B.枳实导滞丸C.木香槟榔丸D.小承气汤积滞内停,湿蕴生热证,治宜选用何方
某患者,女,38岁,肝硬化腹水患者。1周来畏寒发热,体温在38℃左右,全腹痛,腹部明显膨隆,尿量500ml/d。下列体征应特别注意()
胆囊结石的疼痛特点不包括()。
计算桥梁墩台侧模强度时,采用的荷载有()。
2013年3月8日,提取库存现金18000元准备发工资,请填制记账凭证一张。 借:库存现金(1001) 18000 贷:银行存款——工行存款(100201) 18000
根据《物权法》的规定,下列关于留置权的说法中,不正确的是()。
如果负债一价值比在项目生命周期内保持不变,则使用调整净现值法(APV)考查杠杆公司的价值较为便捷。()
在下列存储管理方案中,(16)是解决内存碎片问题的有效方法。虚拟存储器主要由(17)组成。
在考生文件夹下,打开招生数据库sdb,完成如下综合应用:①创建文件名为form的表单,将表单标题改为:录取研究生。②在表单中设计“录取”和“退出”两个按钮。两个按钮功能分别如下:在“录取”按钮(Commandl)中,编写程序,查询总成绩大于或等于3
Completetheformbelow.WriteNOMORETHANTWOWORDSAND/ORANUMBERforeachanswer.MovingCompanyServiceReportExampleAns
最新回复
(
0
)