---What do you have for lunch today? ( )---_________________.A. We have P.E. B. I like English and art. C. I have fish and eggs. 答案:【答案】C【解析】略19.△ABC中,cosA=-$\frac{3}{5}$,a=4$\sqrt{2}$,b=5,则向量$\overrightarrow{BA}$在$\overrightarrow{BC}$方向上的投影为$\frac{\sqrt{2}}{2}$.