题目

A: Hey, Alice. I called you last night, but you didn’t answer it. What were you doing? B: Oh, 【1】. So I didn’t hear it.A: Then, it must be an interesting book. 【2】? B: It talks a lot about Chinese traditional customs.A: That’s attractive. I’ve known that Chinese are celebrating the Spring festival these days.B: That’s right. The Spring Festival is the most important Chinese traditional festival, just like Christmas to us.A: What else do you know about it?B: It often falls on January or February. During the festival, all the family members get together to have a rich dinner.A:如图，PA，PB是⊙O的切线，点A，B为切点，AC是⊙O的直径，∠ACB=70°．求∠P的度数．