D
题意:
哪种动物的睡眠方式与其他动物不同?
A.兔子。B.猫。C.狗。D.奶牛。
细节理解题。根据第三、四段Small animals with short legs sleep on their stomachs(趴着睡).Their body shape is perfect for this posture. They also like to put their legs under their bodies. Rabbits and cats sleep this way. But larger animals sleep differently. They lie on their sides. That's because this is more comfortable for their longer legs. Cows
and hippos(河马)often sleep like this.腿短的小动物趴着睡觉。 它们的体型非常适合这种姿势。它们还喜欢把腿放在身体下面。兔子和猫也是这样睡觉的。但大型动物的睡眠方式不同。它们侧身躺着。这是因为这对他们的长腿来说更舒服。奶牛和河马经常这样睡觉。可知,ABC属于小动物,一般是趴着睡,奶牛属于大型动物,侧身躺着睡觉,故选D。