It's important______the piano well.
A:of him to play
B:for him to play
C:of him playing
D:for him playing
I want to buy a new dress.
折线统计图不但可以表示出数量的多少,还能清楚地反映数量增减变化的趋势.
在转基因超级鼠的研制过程中,需要将大鼠的生长激素基因注入到( )