如图所示，是某同学利用一定质量的水，研究水的体积和温度的关系，并根据实验数据做出体积——温度图像即V——t图像，请根据此图像回答以下问题：

已知$\overrightarrow{AB}=\left(1,k\right),\overrightarrow{AC}=\left(4,2\right),\left|\overrightarrow{AB}\right|\le 5,k\in z$,则$△ABC$是钝角三角形的概率为   （   ）

阅读理解

Alan and Cindy are in the same school. There are many school rules here. First, they can’t listen to music in the classroom or hallways. But they can listen to it outside or in the music room. Second, they can’t eat in the classroom but they can eat in the dining hall. Can they wear hats in class? No, they can’t. What other（其他的）rules do they have? They can't fight with their（他们的）classmates, either. Fights can make the teachers really unhappy…

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