【正文】
skins, which make them difficult for their enemies to find them. 蛇常常有綠色,黃色和黑色的皮膚,使得敵人很難找到他們。 snakes are coldblooded animals. in winter they hibernatein holes which are narrow enough only to hold the snakes’ bodies. the snakes can sleep through a whole winter without eating and moving. they can not feel any pain. the hibernation period lasts