Complete the conversation. （完成对话。）

Marie: Hello! May I speak to Karen?

Karen: Hello! This is Karen. How are you, Marie?

Marie: I’m fine. What ______(do)?

Karen: Nothing much. I ______(study)math.     What about you?

Marie: I _______(clean)my room.

Karen: Hey, do you want to ______(go)to the movies?

Marie: That _______（sound）boring.

Karen: I just call Lucy. She ________(swim). Do you like _______(swim)?

Marie: Sure. We can swim in the school’s swimming pool. When do you want to go?

Karen: Let’s _______(go)to the swimming pool now.

Marie: Great!

关于抛射剂的错误表述为

A．抛射剂在气雾剂中起动力作用

B．抛射剂可兼作药物的溶剂或稀释剂

C．气雾剂喷雾粒子大小、干湿与抛射剂用量无关

D．抛射剂可分为压缩气体与液化气体

E．压缩气体常用作喷雾剂的抛射剂