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    【题目】北京(40°)某中学高中生开展地理课外活动，在连续三个月内三次测量正午太阳高度角，获得测量的数据（见下表）。据此完成下列问题。

    第一次

    第二次

    第三次

    60°

    50°

    40°

    【1】从第一次到第三次测量期间，该地昼夜长短状况及其变化是

    A. 先昼短夜长，后昼长夜短，昼渐短

    B. 先昼长夜短，后昼短夜长，夜渐短

    C. 先昼短夜长，后昼长夜短，夜渐短

    D. 先昼长夜短，后昼短夜长，昼渐短

    【2】三次测量中，其中一次测量的当天，正值

    A. 春分日 B. 夏至日 C. 秋分日 D. 冬至日

    【答案】

    【1】D

    【2】C

    【解析】试题分析：

    【1】由资料可知，在连续3个月，该地太阳高度在递减；由公式正午太阳高度＝90°- 当地纬度±直射点的纬度，第1次测量时，太阳直射北半球，第2次测量时太阳直射赤道，第3次测量时太阳直射点在南半球，北京昼长变化是选昼长夜短，后昼渐短夜渐长，至昼短夜长，故D项正确。

    【2】第1次测量时，太阳直射北半球，第2次测量时太阳直射赤道，第3次测量时太阳直射点在南半球；太阳直射点由北向南移动，说明第2次测量时是当地的秋分日，故C项正确。

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