A:(0,+∞)
B:(0,2)
C:(1,+∞)
D:(0,1)
如图1所示,在△ABC中,点O是AC上一点,过点O的直线与AB,BC的延长线分别相交于点M,N.
The old man lives in that village house by himself, "by himself" probably means
我国境内已知的最早使用天然火的原始人类是( )