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如果你仔细观察猫的眼睛，你会发现，猫的眼睛不仅早上和晚上的时候不一样，就是中午的时候，也与早晚不一样。所以，人们常说，猫的眼睛一日三变。这是为什么呢？原来，猫有一双非常大的瞳孔，而且瞳孔"括约肌"的收缩能力也非常强。猫能够在不同的光线下，很好地调节与之相适应的瞳孔。在早晨中等强度阳光照射下，瞳孔就会形成枣核一般的样子，在中午强烈的阳光照射下，猫的瞳孔又会缩得很小，像一根线那样，在晚上昏暗的情况下，瞳孔则会开放得像满月那样圆大。因为猫的瞳孔具有良好的收缩能力，对光线的反映十分灵敏，所以，在光线过强或过弱的条件下都能清楚地看到东西。
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