A:45°
B:55°
C:60°
D:75°
“种瓜得瓜,种豆得豆”说明____是生物界中的普遍现象;“龙生九子,各有不同”,说明____是生物界的普遍现象.
某同学将六种生物依据某一标准进行分类,结果如方框内所示,你认为她进行分类的依据是( )
- There ________ many trees at the foot of the mountain.
- But now they are slowly disappearing because of human activities.