A、Washington. B、Los Angeles. C、New York. D、New Hampshire. C本题的问题关键词是where。对话中开头就提到了地点为New York，因此选C。

A: Hi, Alice. It’s nice to see you again. I heard that you went to the US during the summer vacation.
B: Yes, I went to New York to attend a summer course in English.
A: How long did you stay there?
B: About 40 days. I went there on July 5th and came back on August 15th.
A: Where did you live in New York?
B: Oh, I lived with an American family, the Williams. They were very friendly to me. I lived in their house.
A: How nice! And how about the course?
B: The course was also very good. The teachers were nice.
A: Oh, you were lucky indeed.
6. Where did Alice go?
7. How long did Alice stay there?