—Once a week.
A:get a gift from
B:borrow a letter from
C:get an email from
f(2015)等于____.
小明同学在家经常用电脑播放《江南style》,还跟着屏幕学跳舞.后来只要音乐响起,家里养的小狗也会活蹦乱跳.狗的这种行为属于( )