请教一道英语阅读理解题,True or False,求讲解, Is it true to say that the Sun is an unreliable guide for exact navigation?True or False?

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请教一道英语阅读理解题,True or False,求讲解, Is it true to say that the Sun is an unreliable guide for exact navigation?True or False?
请教一道英语阅读理解题,True or False,求讲解,

 
Is it true to say that the Sun is an unreliable guide for exact navigation?
True or False?

请教一道英语阅读理解题,True or False,求讲解, Is it true to say that the Sun is an unreliable guide for exact navigation?True or False?
F
最后一句意为:发现在晴朗的日子鸽子很容易选对方向飞行,而在不好的天气就不那么确信,常非错方向.