用一定剂量的稀硝酸处理某种霉菌，诱发了基因突变，稀硝酸最有可能在下列哪个过程中起作用（）

 many nice coats! I can't decide which one to buy.

B: ____

A: Oh, it looks nice. ____

B: Let me see. It's more than 400 yuan.

A: It's too expensive. I prefer the pink one. ____

B: ____I know you want to appear special.

A : Good idea ! ____

B: It's a silk one.

A: Perfect. I'll try it on.

A: What's it made of?

B: How about the green one?

C: What do you think of it?

D: It’s OK, but why not try on a Chinese Tang costume?

E. How much is it?

如图，将矩形ABCD分成15个大小相等的正方形，E、F、G、H分别在AD、AB、BC、CD边上，且都是某个小正方形的顶点，若四边形EFGH的面积为1，则矩形ABCD的面积为(      )