-- Are they about to have dinner?
-- Yes, it ______ in the dining room
A:is being served
B:is severed
C:is serving
D:serves
如图,直线y=12x﹣2与x轴、y轴分别交于点A和点B,点C在直线AB上,且点C的纵坐标为﹣1,点D在反比例函数y=kx的图象上,CD平行于y轴,S△OCD=52,则k的值为____.
____个
小光栽了8棵树,小刚栽了27棵树,还有30棵树没有栽。