题干
In a way, money can bring us and happiness.
A：sadness
B：luck
C：joy
答案(点此获取答案解析）
C
In a way, money can bring us and happiness.
A：sadness
B：luck
C：joy
与连结A(1，2)，B(2，3)的线段没有公共点，则正数a的取值范围是（ ）