| 名称: | |
| 描述: | |
| 公开/私有: | 公开 私有 |
| 标题: | |
| 描述: | |
| 公开/私有: | 公开 私有 |
- astrophysics (2)
- earth day (2)
- environmental protection (2)
- interplanetary voyages (2)
- schools (2)
- aliens (1)
- communication in families (1)
- end of the world (1)
- energy conservation (1)
- families (1)
- foster children (1)
- greenhouse gas mitigation (1)
- human-alien encounters (1)
- nature (1)
- pollution (1)
- pollution prevention (1)
- science fiction (1)
- soils (1)
- teenagers (1)
- vocabulary (1)
主题
| 1. |
|
||
| 2. |
|
||
| 3. |
|
||
| 4. |
|
||
| 5. |
|
||
| 6. |
|
||
| 7. |
|
||
| 8. |
|
||
| 9. |
|
文献类型:
|
|
| 10. |
|
