所有原核细胞都有( )
A:核糖体线粒体
B:细胞膜叶绿体
C:内质网中心体
D:细胞膜核糖体
——Your father never gets up late, does he?——______. It's unusual for him to be late for work this morning.
1米-50厘米=____厘米 6米+39米=____米