仙人掌植物

摘要

仙人掌被称为"沙漠英雄花".它们是如何在干旱的沙漠环境中生存下来的呢?Cactus plants grow in the desert.They come in all shapes.Some are big.Others are small.How do they live in this dry place?They can store water in their stem.The stem is thick.It has a waxy(像蜡的)coat.That keeps the water inside.Cactus plants have no leaves.They have spines.The spines can store water.