单选题：如图，某经线上有一点M，虚线为过M点地面垂直线，L1、L2分别是二至日正午太阳光线。当角α、β之差小于6°时．M点的纬度

题目内容：

如图，某经线上有一点M，虚线为过M点地面垂直线，L1、L2分别是二至日正午太阳光线。当角α、β之差小于6°时．M点的纬度范围是（　　）。

A．3°N 3°S
B．6°N l7．5°N
C．3°N l7．5°N或3°S l7．5°S
D．17．5°S 23．5°S或17．5°N 23．5°N

参考答案：

答案解析：

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