一个实数a的相反数是5,则a等于()
A:15
B:5
C:-15
D:-5
A. So today I've got a cold.
B. So today he's got a stomach ache.
C. So today I've got a stomach ache.
D. So her father took her to the hospital.
E. So today she's got a headache.
某个县城有250栋楼房,每栋平均有有12户人家,共有( )户人家。