题目

Emily has a pen pal in England. Her name is Alice. They write to each other twice a month. In her last letter Alice told Emily how she spent a week in Japan with her family. Here is Emily’s reply(答复)．Dear Alice，Thank you for your last letter. I enjoyed reading it very much. It seemed that you had a more wonderful summer vacation than I did. I hope I can also go to Japan one day．In this letter I will tell you about my best friend. Her name is Kate. Kate has long brown hair and blue eyes and I have short black hair and black eyes. We are both 13 years old，but she is a little taller生物分类的基本单位是（ ）A. 纲 B. 目 C. 科 D. 种