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【题目】下图为北半球中纬度某地某日5次观测到的近地面气温垂直分布示意图。当日天气晴朗,日出时间为5时。读图回答下题。

1

A. 5时、20时大气较稳定

B. 12时、15时出现逆温现象

C. 大气热量直接来自太阳辐射

D. 气温日较差自下而上增大

2

A. 日落时间为17

B. 与海口相比白昼较长

C. 正午地物影子年内最长

D. 正午太阳位于正北方向

【答案】

1A

2B

【解析】试题分析:

1】根据大气的主要的直接热源是地面辐射,C错。一天中最低气温在日出前后,最高气温在14时左右。读图,结合图中曲线,越靠近地面,气温日较差越大,D错。图中12时、15时的气温垂直变化规律是递减,下面热,上面冷,不易发生逆温现象,B错。5时、20时气温下面冷,上面暖,大气较稳定,A对。

2】当日该地是5时日出,日出与日落时间关于中午12时对称,该地日落时间应该是19时,A错。该地位于北半球,昼长为14小时,说明此时北半球是夏季。北半球纬度越高,昼越长,当地在中纬度,海口纬度是20°N,在低纬度,所以比海口市的白昼要长,B对。夏季,物影较短,C错。正午太阳位于正南方向,D错。

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