Question

11．A weather map is an important tool for geographers．A succession of three or four maps presents a continuous picture of weather changes．Weather forecasters are able to determine the speed of air masses and fronts（冷暖空气团接触的锋）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 which 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 （气象站）．Extensive experiments are also in progress for weather modification（改变）studies．But the limitations of modification have prevented meteorological results except in the seeding of super-cooled，upslope mountainous winds which have produced additional orographic （山岳形态的） precipitation on the windward side of mountain ranges．Nevertheless，they have provided a clearer understanding of the fundamentals of weather elements．
 
72．By reading weather maps，students majoring in geography canC．
A．design a project of weather modification
B．interpret the weather condition before the time of observation 
C．obtain data on atmospheric conditions over a wide area 
D．survey ever-changing fronts in local meteorological stations
73．A thirty-day forecast is determined by examiningB．
A．daily weather maps              
B．upper air levels
C．satellite reports                   
D．changing fronts
74．The observation of weather conditions by satellites is advantageous becauseD
A．electronic instruments are used
B．it enables man to alter the weather
C．it makes weather prediction more time-consuming
D．information not obtained readily otherwise can be gained
75．At the present time，experiments are being conducted inA．
A．controlling and influencing weather
B．determining density of pressure groups
C.30-day"outlooks"
D．predicting storms．

Answer 1

分析 文章讲的是通过天气地图了解相关的天气信息．属于科学类短文．

解答 72-75．CBDA
72题答案：C考查细节推理，根据原文第二段的Weather maps contain an enormous amount of information about weather conditions existing at the time of observation over a large geographical area．天气地图包含很大的地理区域范围内观察时的大量天气状况的信息．可知本题答案为C选项．
73题答案：B考查细节推理，从第二段的句子：These 30-day outlooks are based upon an anaiysis of the upper air levels which often set the stage for development of air masses，fronts and storms．""这些三十天的展望基于一项对上层空气的分析--上层空气通常设置了气团、锋及暴风雨的形成状态．可知30天的天气预报是基于上层空气水平的．选B
74题答案：D考查细节推理，根据原文第三段的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 （气象站）．随着电子设备和地球卫星的使用，最近在鉴别与跟踪那些有极少气象站地区风暴方面取得了巨大的收获．可知人造卫星有好处是因为它能够获得可能不容易获取到的信息，故本题答案为D选项．
75题答案：A考查细节推理，根据文章最后一段的Extensive experiments are also in progress for weather modification（改变）studies．为了天气改变研究而进行的大范围试验也在进步之中．可知试验的最终目的是为了"控制和影响天气"，故本题答案为A选项．

点评 本文是一篇科教类阅读，题目涉及多道细节理解题，做题时结合原文和题目有针对 性找出相关语句进行仔细分析，结合选项选出正确答案．推理判断也是要在抓住关键句子的基础上合理的分析才能得出正确的答案．