未知题型 What is the author's attitude in this passage?D.Humorous.

未知题型 P2P的第二个“P”，指的是（）。

未知题型 听力原文：M: Helen isn't here yet. Did you forget to invite her?W: She was going to come, but then she changed her minD.Why isn't Helen present?A.She decided not to comE.B.She forgot to comE.C.She wasn't inviteD.D.She altered her decision.