—What’s wrong with the baby, doctor?
—_______. Just a slight cold.
A:Something serious
B:Serious something
C:Nothing serious
D:Serious nothing
①读史书 ②照镜子 ③自我反思 ④倾听他人评价
命题p:(x-1)(y-2)=0;命题q:(x-1)2+(y-2)2=0,则命题p是命题q的( )