People may have different opinions about MaYun, but I admire him. , he is a successful businessman.
A:As a result
B:After all
C:As usual
D:First of all
一元二次方程x2+3x-4=0的解是 ( ).
如图所示,电路中a、b是电表,闭合开关要使两灯发光,则( )
不论是动物体或是植物体,它的结构和功能的基本单位都是( )