| Other Title | 为什么打呵欠? |
| GMD | Text |
| Corporate Author | National Geographic Society (U.S.) |
| Classification | 612 JER |
| Publisher | 北京 , 外语教学与研究出版社,Foreign Language Teaching and Research Press, 2005 |
| Subject | Human body -- Juvenile literature.Human anatomy -- Juvenile literature.Human physiology -- Juvenile literature. |
| Topic | Grade 2-3 Reading (420L-820L) |
| Series | 国家地理科学探索丛书 |
| Description | 23 p. : col. ill. ; 23 cm. |
| ISBN | 9787560048512 |
| Suitable | From 3 To 8 |