Chores weren't popular at my house. My children didn't like to do chores. They always saw me do chores, but they hardly ever helped me do them.

    A year ago, I made a game called "The Endless Chore Game". It's really great. Here show the game works.

    I make a card with forty squares（方框）, and I writea different chore on each square. These chores can be easy and interesting like making dessert. Then my family roll the dice（骰子）to decide what chores we have to do. The card also has a few squares with fun things, like watching TV and singing. If you're lucky, you can watch TV when the others are doing the chores.

    My son likes the game very much. He goes to the kitchen happily every morning to do the game. It's really a good way to make my children do chores. You can have a try if you have the same problem as me.

2克盐放入100克水中，含盐率为2%．（判断对错）

课本介绍过平面向量数量积运算的几何意义：$\overrightarrow{a}$$·$$\overrightarrow{b}$等于$\overrightarrow{a}$的长度|$\overrightarrow{a}$|与$\overrightarrow{b}$在$\overrightarrow{a}$方向上的投影|$\overrightarrow{b}$|cos<$\overrightarrow{a}$,$\overrightarrow{b}$>的乘积．运用几何意义，有时能得到更巧妙的解题思路．例如：边长为1的正六边形ABCDEF中，点P是正六边形内的一点（含边界），则$\overrightarrow{AP}$$·$$\overrightarrow{AB}$的取值范围是____