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    【题目】从3月21日到9月23日，可能出现的现象是( )

    A. 地球公转速度最慢→快→慢 B. 北极圈内极昼范围的变化小→大→小

    C. 北京正午太阳高度的变化大→小→大 D. 南半球昼长时间短→长→短

    【答案】B

    【解析】试题分析：根据太阳直射点的移动规律。3月21日至9月23日，有个远日点，公转速度最慢，故速度是快-慢-快，故A不符合题意；春分无极昼极夜现象，此后极昼范围变大，6月22日最大，此后变小，故北极圈内极昼范围的变化是小→大→小，故B正确；北京位于北回归线以北地区，夏至日正午太阳高度一年中最大，故正午太阳高度变应该是小-大-小，故C不符合题意；北半球昼长在此期间为短-长-短，故南半球为长-短-长，故D不符合题意。故选B。

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