参考答案

正确答案：D
解析：[听力原文]
M: What's the matter with Mary? I thought she lost something since she is slow in reacting the whole day.
W: She becomes nervous whenever it comes to mathematics.
Q: what do we learn about the conversation?
由选项可推测本题问的是Mary的数学学得怎么样。“slow in reacting”意为“反应迟钝”。女士说Mary一遇到数学就很紧张，可知她数学学得不好，故D)为正确选项。