题干
The idea puzzled me so much that I stopped for a few seconds to try to________.
A：makeitout
B：makeitoff
C：makeitu
D：makeitover
答案(点此获取答案解析）
A
A：makeitout
B：makeitoff
C：makeitu
D：makeitover
又是减函数，且
则a的取值范围是（ ）
