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
79
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.
The thirty-day forecast is determined by examining ______.
选项
A、upper air levels
B、satellite reports
C、changing fronts
D、daily air maps
答案
A
解析
本文第二段最后一句明确指出“These 30-day outlooks are base upon an analysis of the upper air levels with often set the stage for the development of air masses,fronts, and storms”,所以本题的正确答案应当为A。
转载请注明原文地址:https://www.kaotiyun.com/show/ocJd777K
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
随机试题
外观质量得分率,指()外观质量实际得分占应得分数的百分数。
当企业因预防性需求而确定持有的现金余额时,一般不需要考虑的因素是()
呃声洪亮,冲逆而出,烦躁,口臭,渴喜冷饮,苔黄,脉滑数,治疗时宜用何方与柿蒂相伍
下列哪项不是维护心理健康的原则
耳屏前,下颌骨髁状突后缘的腧穴是
在设备安装过程的质量控制中,安装单位自检确认符合安装技术标准后,应提请监理工程师进行检验,经监理工程师检查合格,安装单位方可进行( )工作。
(2012年)下列说法符合企业所得税关于公益性捐赠支出相关规定的是()。
甲公司为增值税一般纳税人,适用的增值税税率为17%,所得税税率25%,售价中均不含增值税。假定销售商品和提供劳务均符合收入确认条件,其成本在确认收入时逐笔结转,不考虑其他因素。2016年12月,甲公司发生如下交易或事项:(1)1日,与乙公司签订为
根据现行《公司法》,下列有关有限公司的表述哪个是错误的?
中央作出新一轮支援新疆的战略部署后,某单位很快组成由党办、人事处、业务处参加的推荐小组,确定了援疆干部人选。这三部门的推荐意见分别是:党办:从甲、乙、丙三人中选派出一至两人。人事处:如果不选派甲,就不选派乙和丙。业务处:只有不选派乙和丙
最新回复
(
0
)