在人群中，能卷舌和不能卷舌是一对相对性状，决定能卷舌的基因（A）是显性基因，决定不能卷舌的基因（a）是隐性基因，一对能卷舌的父母生了一个不能卷舌的孩子，请分析回答：

从方框内选择适当的句子补全对话, 其中有两项是多余的。

A: Hello, Jay. May I ask you some questions?

B: Sure!

A: ____

B: I like collecting postcards.

A: ____

B: The pictures on them. I can learn different cultures from them.

A: That's right. Many people like collecting them.

B: ____

A: Yes, I like collecting CDs.

B: Can you tell me why you like it?

A: ____

B: Do you think developing hobbies is important?

A: Yes. ____

B: But we can't spend too much time on it. We should study hard.

A: You're right.

2×3＝____

6×2＝____

8×2＝____

1×7＝____