A:2V,10V
B:10V,2V
C:2V,8V
D:8V,2V
俗话说“一母生九子,连母十个样”,体现了生物多样性的哪个层次( )
The accident __________ on a cold winter early morning.
下列地形区中,在断层基础上发育形成的是( )