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  3. The science of meteorology is concerned with the study of the structure, state, and behavior of the atmosphere. The subject may

The science of meteorology is concerned with the study of the structure, state, and behavior of the atmosphere. The subject may

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问题     The science of meteorology is concerned with the study of the structure, state, and behavior of the atmosphere. The subject may be approached from several directions, but the scene cannot be fully appreciated from any advantage point. Different views must be integrated to give perspective to the whole picture.
    One may consider the condition of the atmosphere at a given moment and attempt to predict changes from that condition over a period of a few hours to a few days ahead. This approach is covered by the branch of the science called synoptic (天气的) meteorology.
    Synoptic meteorology is the scientific basis of the technique of weather forecasting by means of the preparation and analysis of weather maps and aerological diagram. The practical importance of the numerous applications of weather forecasting cannot be underestimated. In serving the needs of shipping, aviation, agriculture, industry, and many other interests and fields of human activity with accurate weather warnings and professional forecast advice, great benefits are reaped in the form of the saving of human life and property and in economic advantages of various kinds. One important purpose of the science of meteorology is constantly to strive, through advanced study and research, to increase our knowledge of the atmosphere with the aim of improving the accuracy of weather forecasts.
    The tools needed to advance our knowledge in this way are the disciplines of mathematics and physics applied to solve meteorological problems. The use of these tools forms that branch of the science called dynamic meteorology.
In the last sentence of the passage, the phrase "these tools" refers to________.
选项 A、mathematics and physics
B、weather forecasts
C、meteorological problems
D、economic advantage
答案A
解析 词义理解题。these tools中的these是代词，指代前面出现过的内容。前一句话中提到了the tools，the tools是主语，表语是disciplines of mathematics and physics，由此可知，these tools指的就是数学和物理学，故答案为A项。
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