A、By bus. B、By bicycle. C、By subway. D、On foot. B本题的问题关键词是how。对话中男士说除非下雨，不然都是骑车上班的。本题要求学生能理解unless的用法，所以男士在天气好的时候是骑车上班，因此选B。

W: Does your brother feel any better today?
M: He is much better now, thanks. He should be coming home next week. The operation was a success, and he will recover very soon.
Q: Where is the brother now?

W: Do you go to work by bus every day?
M: Not very often. And I also take the subway sometimes. But I generally ride a bike unless it rains.
Q: How does the man go to work when the weather is fine?