星期天,我在家欣赏爸爸养的仙人掌。突然,我发现仙人掌、仙人球、仙人鞭等仙人科植物有一个共同特点,就是茎肉质地厚实,呈绿色,茎上尖刺密布。我问爸爸:“为什么仙人掌会长成这个样子呢?”爸爸说:“因为仙人科植物原产于拉丁美洲,是在干旱缺水的沙漠中逐渐进化而生存下来的,所以 On Sunday, I was home to admire my father’s cactus. Suddenly, I found that cactus, prickly pear, immortal whip and other immortal plants have a common feature, that is thick stalk meat texture, green, spiky stalk stem. I asked Dad: ”Why does the cactus become like this?“ ”Dad said:" Because immortal plants originate in Latin America and survive in arid and dry deserts,