题干
--- It’s so hot today. Why not stay at home and read books?
--- ___________! Let’s read the novel Twilight.
--- ___________! Let’s read the novel Twilight.
A：That’s Ok.
B：Good luck
C：Of course not
D：Good idea
答案(点此获取答案解析）
D
有极大值和极小值，则
的取值范围是