自然科学启蒙 / Let's Read and Find Out Science - 13: 汽油之患 (适合5-9岁阅读)
- 33 Seiten
- 2 Lesestunden



Describes the parts of the hand and all the things our hands help us to do.
Describes the behavior of different kinds of ducks and, in particular, discusses how all ducks use preening to keep their feathers dry.