异丙阿托品扩张支气管的作用机制是（）

A．兴奋β受体

B．阻断M受体

C．稳定肥大细胞膜

D．抑制磷酸二酯酶

E．选择性兴奋β₂受体

A: Could I invite my friends to my house for the Dragon Boat Festival, Mom
B: (76) . That sounds like fun.
A: Yeah. Ummm...Could I borrow some money
B: (77)
A: I need to buy some ingredients to make Zongzi.
B: I’m going to the supermarket and I can buy what you need.
A: (78) .
B: You’re welcome. Oh, could you clean your room
A: (79)
B: You need to clean it again for your friends.
A: OK, Dave is coming early. (80) .
B: All right. By the way, do you know how to make Zongzi Maybe we can make Zongzi together. And then we can give some to your grandparents as well.
A: Perfect.