A、She was open and frank. B、She was not willing to say much. C、Something was wrong with her lips. D、She totally refused to talk

M: So how much was your plane ticket?
W: More than I could really afford. I had to dip into my saving.（女士说机票的价钱超过了她所能承受的，她不得不dip into saving“取存款”，可见机票很贵。）
Q: What does the woman imply?

W: Well, did you manage to get information from Professor Baker? When are our results coming in?
M: Well she was a bit tight-lipped about it.（tight-lipped 意为“嘴巴紧的”，可知Professor Baker 不愿意就考试成绩的事多说。）
Q: What can be inferred about Professor Baker?