从方框中选择合适的选项补全对话 (其中有两项是多余的)。

A: Excuse me, I'm a teacher from Chao Yang School. ____

B: Sure.

A: May I have your name please?

B: My name is Wang Duo.

A: ____

B: I'm in Grade 9.

A: ____

B: I like surfing the Internet and e-mailing people in different countries in my spare time.

A: ____

B: Yes, I think I can improve my English in this way.

A: Sounds great. What are the other advantages of your hobbies?

B: They can help me learn a lot about foreign cultures and customs.

A: Yes, they are really good for you.____

B: You're welcome.

1，﹣78， $\frac{22}{7}$ ，0，0.101001000…，π，﹣3.14，﹣0.333…，0.618

非正整数集合：{                            …}；

无理数集合：{                                 …}；

正有理数集合：{                            …}．

性染色体为(a)XY和(b)YY之精子是如何产生的（   ）