下面说法正确的是（ ）
A：
B：
C：
—I don't know which skirt was ______, so I took them both.—Yes, it's really difficult to choose.
“-3<m<-1”是方程x22+m+y2m+1=1表示双曲线的（ ）
解释含有“蛇”字的成语：
打草惊蛇：____
杯弓蛇影：____
