A、In 621. B、In 1621. C、In 1631. D、In 1641. BWhen was Thanksgiving day first celebrated?

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 laboured 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 favourite 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.