题目

My grandmother often ________ stories at night. What about yours? A . talks B . says C . speaks D . tells 答案：D14．在△ABC中，$\overrightarrow{Ahttp://pic.7249.cn_{0}}$=3$\overrightarrow{http://pic.7249.cn_{0}B}$，∠C=120°，AC=2．且对于边AB上任意一点P，当且仅当P在P0时，$\overrightarrow{PB}$•$\overrightarrow{PC}$取得最小值，则下列结论一定正确的是（　　）A．∠BAC=45°B．S△ABC=$\frac{\sqrt{3}}{2}$C．AC=BCD．AB=$\sqrt{3}$