Mr. Black, our math teacher, ________ his beautiful handwriting.

A. is famous for     B. is angry with     C. is worried about

（2013吉林）结合下图判断，下列说法正确的是

A．硝酸钾的溶解度为45.8g

B．硝酸钾的溶解度大于氯化钠的溶解度

C．升高温度可将硝酸钾的不饱和溶液变为饱和溶液

D．两条曲线的交点所对应溶液的溶质质量分数相等