仙人掌终年翠绿,小问号非常喜爱。有一天,小问号的手无意中碰上了仙人掌,被仙人掌上的刺扎破了,妈妈给他上了点红药水。小问号问妈妈:“仙人掌为什么长刺,是不是专为扎人的?”妈妈笑了,说:“仙人掌上原来没有刺。这刺是怎么长的呢?仙人掌的老家在热带沙漠地区,那里干旱、少雨。仙 Cactus all year round green, a small question mark is very fond of. One day, the hand of a small question mark inadvertently hit the cactus, cactus punctured broken, and my mother gave him a little red syrup. Small question mark asked her mother: ”Cactus why the long thorn, is not designed to tie the people?“ ”The mother laughed and said: " The prickly pear does not have the original thorn .This thorn is how long? Cactus home in the tropical desert Area, where there is a drought, less rain