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 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. 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 monographic precipitation on the windward side of mountain ranges. Nevertheless they have provided a clearer understanding of the fundamentals of weather elements.

　　 1. The observation of weather conditions by satellites is advantageous because it——.

　　　　   A. uses electronic instruments

　　　　   B. enables man to alter the weather

　　　　   C. gives the scientist information not obtained readily otherwise

　　　　   D. makes weather prediction easier

　　 2. The thirty-day forecast is determined by examining

　　　　   A. changing fronts　　　　　　　　　　　　  B. upper air levels

　　　　   C. daily weather maps　　　　　　　　  　　 D. satellite reports

    3. At the present time, experiments are being conducted in——.

　　　　  A. determining density of pressure groups

　　　　  B. 30-day "outlooks"

　　　　  C. manipulating weather　　　　　　　　　　  D. controlling storms

     4. Artificial rainmaking has been most successful in the__

　　　　  A. prairie lands　　　　　　　　　　　　 B. lake area

　　　　  C. western slope of mountains　　　　　　 D. windward side of mountains

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; 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 morning. 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 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. 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 monographic precipitation on the windward side of mountain ranges. Nevertheless they have provided a clearer understanding of the fundamentals of weather elements.

　　 1. The observation of weather conditions by satellites is advantageous because it——.

　　　　   A. uses electronic instruments

　　　　   B. enables man to alter the weather

　　　　   C. gives the scientist information not obtained readily otherwise

　　　　   D. makes weather prediction easier

　　 2. The thirty-day forecast is determined by examining

　　　　   A. changing fronts　　　　　　　　　　　　  B. upper air levels

　　　　   C. daily weather maps　　　　　　　　  　　 D. satellite reports

    3. At the present time, experiments are being conducted in——.

　　　　  A. determining density of pressure groups

　　　　  B. 30-day "outlooks"

　　　　  C. manipulating weather　　　　　　　　　　  D. controlling storms

     4. Artificial rainmaking has been most successful in the__

　　　　  A. prairie lands　　　　　　　　　　　　 B. lake area

　　　　  C. western slope of mountains　　　　　　 D. windward side of mountains

A weather map is an important tool for geographers.   A succession of three or four maps presents continuous picture of weather changes. Weather forecasters are able to determine the speed of air masses and fronts (气锋) to determine whether an individual pressure aroa is deepening or becoming shallow and whether a front is increasing or decreasing in intensity (强烈).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 summary 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 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 anaiysis of the upper air levels which often set the stage for development of air masses, fronts and storms.

     Considerable effort is being exerted today to achieve more accurate weather

predictions, with identifying and tracking storms over regions which have but few meteorological (气象)stations. Extensive experiments are also in progress for weathef modification studies.

1. One characteristic of weather maps NOT mentioned by the author in this passage is_______.

    A. floods        B. fronts        C. temperature changes      D. frosts

2. The thirty-day forecast is determined by examining________.

    A. daily weather maps                     B. upper air levels

    C. satellite reports                      D. changing fronts

3.The observation of weather conditions by satellites is helpful because it________

A.is modern                            

B. uses electronic instruments

    C. makes weather prediction easier

    D. shows things that would otherwise take hours to describe in a few minutes

4.A weather map is a summary because it_______

    A. sums up a great deal of information       B. appears daily

    C. shows changing fronts                     D. is a science book

5.You may possibly read this article in_________.

    A. a magazine    B. newspaper      C. a novel        D. a science book

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 can         .

    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 examining         .

     A. daily weather maps                        B. upper air levels

    C. satellite reports                              D. changing fronts

74. The observation of weather conditions by satellites is advantageous because ______.
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 in         .

    A. controlling and influencing weather

    B. determining density of pressure groups

    C. 30-day “outlooks”

    D. predicting storms

                                                                               
(C)
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 can         .
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 examining         .
A. daily weather maps                        B. upper air levels
C. satellite reports                              D. changing fronts
74. The observation of weather conditions by satellites is advantageous because ______.
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 in         .
A. controlling and influencing weather
B. determining density of pressure groups
C. 30-day “outlooks”
D. predicting storms