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（冷暖空氣團接觸的鋒）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 （氣象站）．Extensive experiments are also in progress for weather modification（改變）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 （山岳形態(tài)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 文章講的是通過天氣地圖了解相關(guān)的天氣信息．屬于科學(xué)類短文．

解答 72-75．CBDA
72題答案：C考查細節(jié)推理，根據(jù)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．天氣地圖包含很大的地理區(qū)域范圍內(nèi)觀察時的大量天氣狀況的信息．可知本題答案為C選項．
73題答案：B考查細節(jié)推理，從第二段的句子：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．""這些三十天的展望基于一項對上層空氣的分析--上層空氣通常設(shè)置了氣團、鋒及暴風(fēng)雨的形成狀態(tài)．可知30天的天氣預(yù)報是基于上層空氣水平的．選B
74題答案：D考查細節(jié)推理，根據(jù)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 （氣象站）．隨著電子設(shè)備和地球衛(wèi)星的使用，最近在鑒別與跟蹤那些有極少氣象站地區(qū)風(fēng)暴方面取得了巨大的收獲．可知人造衛(wèi)星有好處是因為它能夠獲得可能不容易獲取到的信息，故本題答案為D選項．
75題答案：A考查細節(jié)推理，根據(jù)文章最后一段的Extensive experiments are also in progress for weather modification（改變）studies．為了天氣改變研究而進行的大范圍試驗也在進步之中．可知試驗的最終目的是為了"控制和影響天氣"，故本題答案為A選項．

點評 本文是一篇科教類閱讀，題目涉及多道細節(jié)理解題，做題時結(jié)合原文和題目有針對 性找出相關(guān)語句進行仔細分析，結(jié)合選項選出正確答案．推理判斷也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確的答案．