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【单选题】
下列关于动物特征的叙述正确的一组是（ ） ①爬行动物体表的鳞片可以防止体内水分的蒸发 ②腔肠动物有口无肛门 ③鱼的胸鳍和腹鳍可以控制前进的方向 ④蚯蚓的身体有许多相似的环状体节构成 ⑤哺乳类和鸟类都是心脏四腔，体温恒定 ⑥青蛙用鳃和皮肤呼吸 ⑦鸟类的呼吸是在肺和气囊进行气体交换．A.
①②③④⑦
B.
①②⑤⑥⑦
C.
①③④⑤⑦
D.
①②④⑤
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