极昼现象从南极点扩大到南极圈的时期是: A、春分到夏至      B

极昼现象从南极点扩大到南极圈的时期是:

A、春分到夏至      B、秋分到冬至     C、夏至到秋分     D、冬至到春分

答案

   B


解析:

主要考察学生对基础知识的掌握和理解。昼夜长短的变化是地球公转的意义之一,随着太阳直射点在南北回归线之间的往复运动,极圈到极点之间的纬度范围内就会出现极昼和极夜现象。即从3月21日到6月22日,极昼现象会从北极点扩大到北极圈,极夜现象则从南极点扩大到南极圈;而从9月23日到12月22日,极昼和极夜现象的变化则正好相反。故选 B 项。

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