题干
He has two basketballs. One is new, ________ is old.
A：the other
B：other
C：the others
D：others
答案(点此获取答案解析）
A
He has two basketballs. One is new, ________ is old.
A：the other
B：other
C：the others
D：others
上不是单调函数，则实数k的取值范围是