A、Computer science. B、Physics. C、Chemistry. D、Mathematics. A根据选项，推测对话的内容与一个人的专业或者学科相关，对话中涉及到四个专业，但是要听清题目问的是男士现在的专业，因此只能在听清问题中的no

M: How are your new neighbors?
W: They are wonderful people. I am happy now. I was really fired of the quarrelsome couple that lived here before.
Q: What is the woman’s opinion about her new neighbors?

W: Are you glad that you’re studying computer science?
M: Yes, indeed. I had wanted to major in physics, chemistry, or mathematics. But I have changed my mind.
Q: What is the man’s major now?