普萘洛尔禁用于支气管哮喘患者的原因是由于 A．β1受体阻断作用 B．膜稳定作用

从对话后的方框中选择适当的选项补全对话
A: How are you going to spend this long summer holiday, Xiao Ming?
B: I'm going to visit Hainan Island.
A: 小题1:__
B: No, I'llgo there by myself.
A; __小题2:_
B; By plane. It takes only about two hours to get there.
A_:__小题3:__
B; Thank you very much. How about you?
A: I’ll go back to my hometown to see my parents.
B_:__小题4:__
A; My pleasure.
B; Thank you.
A: You' re welcome.

A. Say hello to your parents for me. B. How will you get there? C. Will you go there with your parents? D. I'm sure you will enjoy yourself there.