龟的栖息地: ocean,lake,desert, forest, pond, stream 龟的种类: turtle,tortoise 龟的身体部位: scaly skin, webbed feet, flippers,shell, legs,beaknostrils, neck, scutes, backbone, egg tooth 龟的食物: plant,small animal 龟的繁殖过程: digging a nest in the dit or sand, laying eggs in thenest, covering eggs, eggs hatching 形容词性物主代词的用法，例如: their, its,our,her 副词的用法，例如: mostly, slowly, quickly 连词的用法，例如: and, or,as soon as 情态动词的用法，例如: can,may 定语从句，例如: Baby turtles eat the same kinds of foods thatadults eat. 特殊疑问句，例如: How can you help turtles? 祈使句，例如: Don't keep them as pets. There be 句型，例如: There are more than 300 kinds of turtles