在平面直角坐标系xOy中，过点A（﹣4，2）向x轴作垂线，垂足为B，连接AO．双曲线y=$\frac{k}{x}$经过斜边AO的中点C，与边AB交于点D．

（1）求反比例函数的解析式；

（2）求△BOD的面积．

已知$\left|\overrightarrow{OA}\right|=\left|\overrightarrow{OB}\right|=1,\angle AOB=\frac{2\mathrm{\pi }}{3},\overrightarrow{OC}=\overrightarrow{OA}+2\overrightarrow{OB},$则$\left|\overrightarrow{OC}\right|$与$\left|\overrightarrow{OB}\right|$夹角为（  ）

   Many teenagers feel that the most important people in their lives are their friends．They believe that their family members don’t know them as well as their friends do．In large families，it is quite often for brothers and sisters to fight with each other and then they can only go to their friends for some ideas．
   It is very important for teenagers to have one good friend or a group of friends．Even when they are not with their friends，they usually spend a lot of time talking among themselves on the phone．This communication is very important in children’s growing up，because friends can discuss something．These things are difficult to tell their family members．
   However，parents often try to choose their children’s friends for them．Some parents may even stop their children from meeting their good friends．Have you ever thought of the following questions?
    Who chooses your friends?
   Do you choose your friends or your friends choose you?
   Have you got a good friend your parents don’t like?
   Your answers are welcome．

圆有一条对称轴，是它的直径。