A:being fined
B:having been fined
C:to be fined
D:to have been fined
从中任取一球,记下数字作为点A的横坐标x,把小球放回袋中,再从中任取一球记下数字作为点A的纵坐标y,点A(x,y)在函数y=3x的图象上.
齐桓公称霸、商鞅变法等历史现象反映的时代特征是( )