企鹅的适应性特征
<b>(a)</b> 它是白色的，能与白色的背景很好地融合
<b>(b)</b> 它们的身体呈流线型，脚上有蹼，使它们成为优秀的游泳者
<b>(c)</b> (a)和(b)都对
<b>(d)</b> 以上都不对

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