题目:
天气晴朗时,池塘里的水绵经常一团团漂浮在水面,其原因是( )
A.水绵比水轻
B.水绵细胞都死亡后,水绵漂浮起来
C.水中其他动物游动时,将水绵带到水面上来
D.水绵进行光合作用释放的氧气,积存在一起使水绵漂浮到水的表面上来
答案:
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