题目

You can never imagine _________ we had on the beach during our last holiday. A. how many funs       B. fun  C. what a fun  D. how much fun 答案：D19．在平面直角坐标系xOy中，M为不等式组$\left\{\begin{array}{l}3x-y-6≤0\\ x-y+2≥0\\ x≥0，y≥0\end{array}\right.$所表示的区域上一动点，已知点A（-1，2），则直线AM斜率的最小值为（　　）A．-$\frac{2}{3}$B．-2C．0D．$\frac{4}{5}$