一组数据：0，1，2，3，3，5，5，10的中位数是（   ）

①赤道是划分纬度的起点线，是90°纬线

②赤道是划分经度的起点线，是0°经线

③赤道是南半球和北半球的分界线

④赤道是南、北纬度的分界线

    Today is Sunday. It's a sunny day. I'm in the park with my best friends Mary and Carol. There are many people in the park. They're doing different kinds of things. Some are walking by the lake. Some are talking under a big tree. Some are singing. Some are dancing on the playground. There are some kids playing tennis. Mary, Carol and I are sitting by the pool. It's really a fun day. The people here are all very happy. They're having a good time.

阅读短文，判断正误

一个汽车车牌在水中的倒影为 ，则该车的牌照号码是____．

先化简，再求值：2(a＋ $\sqrt{3}$ )(a－ $\sqrt{3}$ )－a(a－6)＋6，其中a＝ $\sqrt{2}$ －1.