“Did you go skating a lot last year?” I asked. Jen shook her head and looked at me. Finally she said， “On Thanksgiving， Mom and I always went to visit some friends who lived on a farm. I especially loved seeing their big turkeys.”

    Until then， I didn't think about how Jen felt. She had a new stepfather (继父) and stepbrother，and had a new town and home， too. Jen and her mom used to live near a lake where Dad and I went every summer， and she had to move up north with us. She had more changes than me.

    Jen seemed sad， so I was busy thinking of some ways to cheer her up on Thanksgiving. I told her my plan and she was excited. First we made a huge snowball， and then a small snowball. Then we built a wall behind the big snowball as a tail. Jen mixed some food coloring with water， saying， “We can spray (喷) colors on the tail.” Our snow turkey had a red， blue， green， and yellow tail. We were so busy that we didn't notice our parents come outside. Dad found a hat for the snow turkey， and Mom wrapped her scarf around its neck.

    “Thanks for cheering Jen up，” Mom said. “You're a good brother， and you always come up with great ideas.'' A happy feeling spread through me. I began to understand how much she cared about everyone in our new family.

下列四个图象分别对应四个变化过程，其中正确的是（  ）

设向量$\overrightarrow{a}$=（sinx，$\sqrt{3}$sinx），$\overrightarrow{b}$=（sinx，cosx），x∈0，$\frac{\mathrm{\pi }}{2}$．

（Ⅰ）若|$\overrightarrow{a}$|=|$\overrightarrow{b}$|，求x的值；

（Ⅱ）设函数f（x）=$\overrightarrow{a}$$·$$\overrightarrow{b}$，将f（x）的图象向左平移$\frac{\mathrm{\pi }}{6}$个单位得到函数g（x）的图象，求g（x）的最大值及此时相应的x值．