题目

What's the most probable relationship between the speakers?A. Electrician and owner. B. Boss and employee. C. Husband and wife 答案：【答案】C【解析】M: Wow, look at all the electronics on sale!W: That’s not why we’re here. We can look at the electronics department another time, honey.M: OK, you’re the boss today.W: Well, you promised to buy me a new dress and I need it for the party tomorrow. Let’s go upstairs.此题为听力题，解析略。⊙O1和⊙O2交于A、B两点，且⊙O1经过点O2，若∠AO1B=90°，那么∠AO2B的度数是________．