Modern civilizations are as dependent on trees as ______.
举一反三
- The first trees were like modern trees in most ways except that ______. A: they do not have branches B: they do not have flowers C: they do not have seeds D: they do not need sunlight
- World civilizations are rich andcolorful. The differences between _________civilizations are a basic characteristic of human society.
- American Indians had developed three brilliant civilizations before the Europeans arrived. These three civilizations were_____________________,________________________, and _________________.
- Dali is known as the "Crossing of Asian Civilizations" .
- People who love trees may （）. A: never cause trees injury B: damage trees on purpose C: do harm to trees without knowing it D: not be aware of which trees are healthy