题干
—Betty was feeling pretty blue for a while, but she’s better now.
—_______.
—_______.
A：Oh, that’s kind of you
B：Congratulatio
C：Oh, I’m glad to hear that
D：It’s my pleasure
答案(点此获取答案解析）
C
中,圆
的方程为
,若直线
上至少存在一点,使得以该点为圆心,1为半径的圆与圆
的取值范围是（ ）
