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
A weather map is an important tool for geographers. A succession of three of four maps presents a continuous picture of weather
A weather map is an important tool for geographers. A succession of three of four maps presents a continuous picture of weather
admin
2010-06-30
44
问题
A weather map is an important tool for geographers. A succession of three of four maps presents a continuous picture of weather changes. Weather forecasts are able to determine the speed of air masses and fronts; to determine whether an individual pressure area is deepening or becoming shallow and whether a front is increasing or decreasing in intensity. They are also able to determine whether an air mass is retaining its original characteristics or taking on those of the surface over which it is moving. Thus, a most significant function of the map is to reveal a synoptic picture of conditions in the atmosphere at a given time.
All students of geography should be able to interpret a weather map accurately. Weather maps contain an enormous amount of information about weather conditions existing at the time of observation over a large geographical area. They reveal in a few minutes what otherwise would take hours to describe. The United States weather Bureau issues information about approaching storms, floods, frosts, droughts, and all climatic conditions in general. Twice a month it issues a 30-day "outlook" which is a rough guide to weather conditions likely to occur over broad areas of the United States. These 30-day outlooks are based upon an analysis of the upper air levels with often set the stage for the development of air masses, fronts, and storms.
Considerable effort is being exerted today to achieve more accurate weather predictions. With the use of electronic instruments and earth satellites, enormous gains have taken place recently in identifying and tracking storms over regions which have but few meteorological stations. Extensive experiments are also in progress for weather modification studies. But the limitations of weather modification have prevented meteorological results except in the seeding of super-cooled, upslope mountainous winds which have produced additional orographical precipitation on the windward side of mountain ranges. Nevertheless, they have provided a clearer understanding of the fundamentals of weather elements.
At the present time, experiments are being conducted in ______.
选项
A、30-day "outlook"
B、controlling storms
C、satellites
D、manipulating weather
答案
D
解析
文中第三段第三句说“在改造天气的研究中人们进行了许多实验”,D项与此意相符,所以选项D为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/70Jd777K
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
IfyouarebuyingapropertyinFrance,whetherforapermanentoraholidayhome,itisimportanttoopenaFrenchbankaccount
IfyouarebuyingapropertyinFrance,whetherforapermanentoraholidayhome,itisimportanttoopenaFrenchbankaccount
IfyouarebuyingapropertyinFrance,whetherforapermanentoraholidayhome,itisimportanttoopenaFrenchbankaccount
IfyouarebuyingapropertyinFrance,whetherforapermanentoraholidayhome,itisimportanttoopenaFrenchbankaccount
IfyouarebuyingapropertyinFrance,whetherforapermanentoraholidayhome,itisimportanttoopenaFrenchbankaccount
IfyouarebuyingapropertyinFrance,whetherforapermanentoraholidayhome,itisimportanttoopenaFrenchbankaccount
IfyouarebuyingapropertyinFrance,whetherforapermanentoraholidayhome,itisimportanttoopenaFrenchbankaccount
IfyouarebuyingapropertyinFrance,whetherforapermanentoraholidayhome,itisimportanttoopenaFrenchbankaccount
IfyouarebuyingapropertyinFrance,whetherforapermanentoraholidayhome,itisimportanttoopenaFrenchbankaccount
随机试题
阅读下面程序importjava.io.*;publicclassTypeTransition{publicstaticvoidmain(Stringargs[]){chara=‘h’;inti=100;intj=97;intaa=a+i;
在两样本均数推断两总体均数差别的t检验中,无效假设是
生甘草宜用于
患者,胃、十二指肠溃疡出血,经对症治疗出血停止,病情缓解,大便隐血阳性。患者呕血时,应给予安置()。
案情:国有企业川南商业大楼于2008年年初拟定改制计划:将资产评估作价150万元出售,其中105万元出售给管理层人员(共4人),45万元出售给其余45名职工,将企业改制为川南百货有限公司,注册资本150万元,该改制计划于同年2月经有关部门批准实施。原管理层
根据以下资料,回答下列问题:2004年8月27日,N省某市教育局下发了一份《关于对在校学生饮用水试行定点供应工作的通知》,要求市直各中、小学全部饮用本市A水业公司和B纯净水公司生产的纯净水,其他饮水企业和经销商禁止进入学校。同年9月14日,C、D
设向量组α1,α2,α3线性无关,证明:α1+α2+α3,α1+2α2+3α3,α1+4α2+9α3线性无关.
On a(75)memory system,the logical memory space available to the program is totally independent of the physical memory space.
EachofQuestions1to7presentstwoquantities.QuantityAandQuantityB.Comparethetwoquantities.Youmayuseadditional
ASocioculturalApproachtoReading,LanguageandLiteracyI.ThemeaningoftakingasocioculturalapproachA.Itrejectsthe【
最新回复
(
0
)