It was a three-day holiday. Tom and his family took a trip to Beijing. They went there by plane. On the first day, they went to the Great Wall. Tom took lots of pictures there. On the second day, they went boating in Beihai Park and ate Beijing Roast Duck in a restaurant. On the third day, Tom bought gifts for his friends and then they went back home by train. It was a great holiday!
1．根据短文内容的先后顺序，为下列图片标上序号。
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