Question

                                    B

                     

                A weather map is an important tool for geographers. A series 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; to determine whether a pressure area is deepening or becoming shallow and whether a front is increasing or decreasing in intensity (強(qiáng)度) .They are also able to determine whether an air mass is keeping its original characteristics or taking on those of the surface over which it is moving. Thus,a most important function of the map is to show a general 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 a large 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 and all climatic conditions in general. Twice a month it issues a 30-day “out-look” 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.

                Much effort is being made today to achieve more accurate weather predictions. With the use of electronic instruments and earth satellites,big gains have taken place recently in recognizing and tracking storms over regions which have few meteorological stations（氣象臺(tái)）. A lot of experiments are also in progress for weather modification（人工改變天氣) studies. But the limitations of weather modification have produced few results except in the seeding（撒干冰） of super cooled,upslope mountainous winds which have produced additional rainfall on the windward(上風(fēng)的) side of mountain ranges.

6. Paragraph 1 mainly deals with .

   A. the functions of weather maps

   B. the work of weather forecasters

   C. the importance of weather forecast

   D. the relationship among weather elements

7. What's the advantage of using weather maps?

   A. It uses electronic instruments.

   B. It enables man to control the weather.

   C. It gives general information about climate.

   D. It offers much information about the weather.

8. The 30-day forecast is determined by examining.

   A. air masses           B. upper air levels

   C. satellite reports    D. changing fronts

9. At the present time,experiments are being performed in .

   A. 30-day outlooks

   B. controlling storms

   C. controlling weather

   D. accurate weather predictions

10. Artificial rainfall has been most successful in the .

   A. lake areas

   B. grasslands

   C. western slopes of mountains

   D. windward sides of mountains

Answer 1

6. A 7. D 8. B 9. C 10. D

B篇(自然)

本文是說(shuō)明文。文章主要介紹了氣象圖及其作用。

6. A. 段落大意題。由第一段中的Aweather map is an important tool for geographers ... Weather forecasters are able to determine ... They are also able to ... a most important function of the map is to ...可知，本段主要介紹了氣象圖的作用。

7. D. 推理判斷題。由第二段中的They reveal in a few minutes what otherwise would take hours to describe 可知，使用氣象圖的好處是它能提供更多的天氣信息，因?yàn)樗�在幾分鐘�?nèi)展示的天氣情況是用其他方式要花幾個(gè)小時(shí)才能展示的。

8. B. 細(xì)節(jié)理解題。由第二段中的These 30-day outlooks are based upon an analysis of the upper air levels可知，這些以三十天為一個(gè)周期的氣象圖是在對(duì)上層氣流的分析基礎(chǔ)上編制的。

9. C. 細(xì)節(jié)理解題。由最后一段中的Alot of experiments are also in progress for weather modification studies 可知，人們正在做實(shí)驗(yàn)來(lái)改變天氣、控制天氣。

10. D. 細(xì)節(jié)理解題。由最后一段中的But the limitations of weather modification ... super cooled,upslope mountainous winds which have produced additional rainfall on the windward side of mountain ranges 可知，D項(xiàng)正確。