A:2
B:-2
C:6
D:6-2x
在探究“比较不同物质吸热的情况”实验中,实验装置如图所示.
袋中有5个白球,x个红球,从中随机摸出一个球,恰为红球的概率为45,则x为( )
The old man didn't marry his young daughter _________ the rich man.