A:染色体和线粒体
B:线粒体和叶绿体
C:叶绿体和染色体
D:线粒体和核糖体
已知点A(1,3), B(3,1 ), C(-1,0),则△ABC的面积为( )
—Could you tell me the________ of making such tasty cakes?
—Well, I just follow the directions in the cookbook.
鸟卵中,将来可孵化成雏鸟的部分是 ( )