All students of geography should be able to interpret a weather map accurately. Weather maps contain an enormous amount of information about weather condition 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.
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 supercooled, upslope mountainous winds which have produced additional rainfall on the windward side of mountain ranges. Nevertheless, they have provided a clearer understanding of the fundamentals of weather elements.
26. The observation of weather conditions by satellites is advantageous because it_______.
A. enables man to alter the weather
B. makes weather prediction easier
C. gives the scientist information not obtained readily otherwise
D. uses electronic instruments
27. One characteristic of weather maps NOT mentioned by the author in this passage is
A. fronts B. thermal changes
C. frost D. wind speed
28. The thirty-day forecast is determined by examining_______.
A. daily weather maps B. upper air levels
C. satellite reports D. changing fronts
29. At the present time, experiments are being conducted in_____
A. 30-day outlook B. controlling storms
C. controlling weather D. determining density of pressure groups
30. Artificial rainmaking has been most successful in the_______.
A. lake area B. western slope of mountains
C. grass lands D. windward side of mountains
26. C 27. B 28. B 29. C 30. D
雅思口语考场窍门
雅思口语备考小技巧:练口语还得看肥皂剧
考场直击:雅思口语技巧速递
2011年02月19日雅思写作分享
雅思口语秘诀:“化抽象为具体”
2015年02月12日雅思写作分享
2011年02月17日雅思听力分享
雅思口语备考攻略:3阶段
备考雅思口语的六条军规
雅思口语高分误区
2011年03月10日雅思阅读分享
三个雅思口语小窍门
2011年03月10日雅思口语分享
2011年03月12日雅思阅读分享
2014年1月8日雅思笔试回忆
6种技巧学好雅思口语
2011年03月10日雅思写作分享
2011年03月05日雅思听力分享
名师谈提高雅思听说能力的技巧
从考官口中套出的雅思口语答题注意事项
雅思口语技巧:扫除雅思考试最大障碍
一个月内提高雅思口语成绩需主攻技巧
2014年02月17日雅思写作分享
2011年03月10日雅思听力分享
雅思口语流畅表达的训练技巧
2011年2月雅思考试分享汇总
2014年02月19日雅思口语分享
雅思口语8分回答技巧分享
雅思口语答题技巧之讲故事法
如何利用网络资源提高雅思口语
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |