读“桂、贵、苏、粤四省区老年人口比重与同期全国老年人口比重平均水平差值百分比图”据此完成小题。
--- You look unhappy. What happened?
--- I just had a fight with my mom and I felt __________ it. I shouldn’t have done that.
下列关于声音的说法中不正确的是( )