题干
— Chinese women's volleyball team won the gold medal in 2016 Rio Olympic Games.
—______ Chinese people were at that time!
A：What sad
B：How sad
C：What excited
D：How excited
答案(点此获取答案解析）
D
其中m>0，若方程3f(x)=x恰有5个实数解，则m的取值范围为 （ ）