A、In 621. B、In 1621. C、In 1631. D、In 1641. B对话中男士问When was it first celebrated?，女士回答说In 1621，由此可知，答案为[B]。

M: Mary, last week in our history class, our teacher asked us if we knew anything about Thanksgiving Day. We all looked at each other. Nobody could give the answer. So, please tell me something about it, will you?
W: Oh, it’s a long story. I don’t think you’ve got the patience.
M: Come on, I’m really interested. Is it a national holiday in the United States?
W: Yes, it’s a most truly American holiday and it’s closely connected with the earliest history of the country.
M: When was it first celebrated?
W: In 1621. By the English settlers or pilgrims.
M: What people were the pilgrims?
W: They were religious people from England. At that time, they didn’t have the right to worship in their own way. They sailed to America on the Mayflower to have freedom of worship.
M: What happened to them when they got to America?
W: During their first winter, over half of the settlers died of starvation or epidemics. The survivors began farming, hunting and fishing and labored hard.
M: Did they have a good harvest the first year?
W: Yes, the yield was rich beyond their expectations. That’s why they decided to fix a day to give their thanks to God.
M: Oh, I see. How do people in the States celebrate it now? And when is it?
W: The fourth Thursday of November is Thanksgiving Day. It’s an occasion of family reunion. The most traditional and favorite food on the dinner table is roast turkey and pumpkin pie. Of course, with lots more to eat.
M: OK, you’ve helped me out. I’d like to treat you to ice cream. Let’s get going.
Questions 23 to 25 are based on the conversation you have just heard.
23. Where did the man hear of Thanksgiving Day for the first time?
24. When was Thanksgiving Day first celebrated?
25.What people were the pilgrims?