第20题: [单项选择]Why does the professor say this A. To correct something she said earlier. B. To explain what she just introduced. C. To explain what is wrong with a particular theory. D. To remind the students of something discussed earlier. 参考答案:B 答案解析:[解析] 本题为语用理解题,考查目的同上题。题目问:教授为什么要说这句话 这句话是:“What I’m trying to say is that some have been preserved i