题干
The ______ of her children playing in the yard is always remembered by the mother.
A：screen
B：scene
C：landscape
D：scenery
答案(点此获取答案解析）
B
The ______ of her children playing in the yard is always remembered by the mother.
A：screen
B：scene
C：landscape
D：scenery
又是减函数，且
＜0，则a的取值范围是（ ）
