完形填空

    I've got some information for everyone who is going to Britain next month. As you know, you are  1  with a family for two weeks. Now the most important thing is  2  . You should take about ￡30 in cash(现金) and about ￡200 in traveler's cheques(支票). Then when you  3  at the airport you'll meet your host family. You must remember to wear a red shirt so the family will find you  4  . I've told them to look for the red shirt. You'll also  5  to take with you four photos of yourself.  6 is very important for you to take the school letter. While you are there,  7  you have any problems, you can call our agent(代理人). I'll give you her office  8 now. It's 580-4436 and the person to ask for is Mrs. Belcher. She's in the office  9  9 am to 5 pm every day. OK! That's everything. Enjoy 10  during the stay in England.

线段AB两个端点的坐标分别为A（6，6），B（8，2），以原点O为位似中心，将线段AB缩小为原来的$\frac{1}{2}$后得到对应的线段CD，则端点C的坐标为（　　）