DNA的图像分析一般用（） A.PAS染色 B.Feulqen染色 C.DNA倍体染

I used to dance． Now I enjoy dancing． You had to get a good camera and buy films（胶卷）． Did you used to collect stamps? You’ve changed a lot． It helps me to be more careful and it gives me a lot of fun． You used to listen to music, didn’t you?

A：__1___
B：Yes, I did, but now I am interested in listening to music and playing the violin．When I am free, I enjoy playing it．
A：___2__
B：That’s right．What do you like doing now, Jack?
A：___3___
B：That’s a good hobby．What do you think of it?
A：___4___
B：What did you use to do?
A：I used to take photos．
B：I think taking photos is expensive．____5___ Am I right?
A：You are right．So I don’t do it now．