题干
Bonnie looks very smart and is always ________ pink because pink is her favorite color.
A：with
B：on
C：about
D：in
答案(点此获取答案解析）
D
Bonnie looks very smart and is always ________ pink because pink is her favorite color.
A：with
B：on
C：about
D：in
在
上是
的减函数，则
的取值范围是