A: Good morning, Linda!
B: Good morning, Cindy! ____
A: It's my family photo.
B: ____
A: Yes, she is. And this is my father.
A: No, he isn't. He is an English teacher.
A: Yes, he is.
A: Thanks.
A. Is she your mother?
B. Where's your father?
C. Is your father a maths teacher?
D. What's this?
E. Is the boy your brother?
F. Nice to meet you!
G. Your family photo is nice.
下列有竞争关系的生物是（ ）
物理实验都需要有一定的控制条件．奥斯特做电流磁效应实验时，应排除地磁场对实验的影 响．关于奥斯特的实验，下列说法中正确的是（ ）
