硅酮密封膏中的G类，主要用于( )。A．预制混凝土墙板 B．卫生间的防水密封 C．

从方框中选择适当的句子补全对话，有两项多余。
A: Good morning.
B:   小题1: 
A: Do you have a friend here?
B: Yes, I do.
A:   小题2: 
B: Oh. She is my friend, Amy.
A:  小题3:
B: She comes from the U.S.A.
A: She looks like Judy.
B: 小题4: 
A: Are they in the same class?
B: No. They are in the same grade.   小题5: 

A. Who is that girl? B. But they’re in different classes. C. Where is she? D. They are sisters. E. Good morning. F. Thank you. G. Where does she come from?