A：为了降低线路坡度
B：增加线路长度，发展旅游
C：为了通过更多地山村
D：为了增加山区线路密度
关于灭菌和消毒的不正确的理解是( )
补全对话。
Anna: ____.
John: ____. Can I have a look?
Anna: ____. Here you are.
John: ____.
John: You are welcome.
A. Sure!
B. I have a nice cat.
C. Oh, really?
D. Thank you.
E. Oh! It's nice. I like it.
