286.
W: Hello, glad to see you. Come in, please.
M: Thanks. It looks like the party is exciting and all are in high spirits.
W: My brother, Tom is visiting me for the weekend.
M: Where is he?
W: He is sitting in the corner over there, and beside the yound woman.
M: And who is the yound woman? Uh, the woman wearing a red coat.
W: Oh, that's Ann, my piano teacher.
M: Piano teacher! I never knew you were practicing the piano.

答案解析：
(1) 正确答案为A。根据My brother, Tom is visiting me for the weekend.我哥哥汤姆周末过来看我。可知，女子的哥哥周末来看她，因此A项正确。
(2) 正确答案为B。根据Oh, that's Ann, my piano teacher. 哦，那是安，我的钢琴老师。可知，安是女子的钢琴老师，即女子跟安学钢琴，因此B项正确。