星期天,妈妈带我去菜市场买螃蟹。菜市场里的螃蟹真多呀!螃蟹们好像知道自己要被卖掉似的,它们有的不停地吐泡泡抗议;有的想爬出水池;还有的挥舞着有力的蟹螯,想把我们吓跑……“老板,我要两斤螃蟹。”妈妈对卖螃蟹的叔叔说。叔叔一边拿袋子,一边问:“你要买公螃蟹还是母螃蟹?”“咦,螃蟹还分公和母吗?”我好奇地问道。“那当然啦!”妈妈一边说,一边抓起一只螃蟹,“你看,这只螃蟹的肚子上的壳是三角形的,说明它是公螃蟹。如果这只螃蟹的肚子上的壳是半圆形的,那它就是母螃蟹。母螃蟹有蟹黄, Sunday, my mother took me to the market to buy crabs. There are so many crabs in the vegetable market that crabs seem to know they are being sold, some of them spit bubbles of protest, others want to climb out of the pool, Scared us ... ”“ Boss, I want two pounds of crab. ”“ Mom said to the uncle selling crabs. Uncle while holding the bag, while asked: ”You want to buy public crab or mother crab? “ ”咦, crab also male and female?“ I asked curiously. ”Of course!“ Said the mother while grabbing a crab, ”You see, the shell of the crab’s stomach is triangular, indicating that it is a male crab .If the crab’s stomach The shell is semicircular, then it is the mother crab. The mother crab has crab,