某生物的体细胞含有42条染色体，在减数第一次分裂前期，细胞内含有的染色单体、染色体和 DNA分子数依次是（　　）

    Hi, I'm Lisa. Look at the picture of my family. There are four people in my family. We live in Russia. Next month, we are going to travel around China. We are going to stay for ten days. We are going to the Summer Palace, the Great Wall and Wangfujing Street. They are all in Beijing. I hope we have fun time.

有三个数○；○9；○26，它们的平均数是170，则圆圈内的数字分别是____ ，____ ，____ ．