阅读短文，然后根据其内容从A、B、C、D中选出最佳选项。

Mr Li: Sam, did you enjoy your first Spring Festival in China?

Sam: Yes, I did. During this festival, many family members get together.

Mr Li: Yes. I hear that at Thanksgiving Americans also get together for a special meal. It sounds similar.

Sam: Yes. It's similar. During these holidays, both the Chinese and Americans come home and have a big dinner. It's great fun.

Mr Li: What do you think are the main differences between the Spring Festival and Thanksgiving?

Sam: Well, we take part in different activities and eat different kinds of food. In China, people usually set off fireworks and eat dumplings. In the US, we usually watch a Thanksgiving parade and an American football game on TV. We also eat turkey.

Mr Li: That's interesting.

某地洪水为患，消息上报朝廷后，皇帝一方面交代工部尽快抢修溃决的堤防，勿使水患继续扩大；另一方面责成户部尽快调度粮食，运往灾区，赈济灾民。幕僚根据皇帝之意，写成诏书，经皇帝确认无误后，直接送至工部、户部等单位执行。这是下列哪个时期的制度

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