What are the 2 main fields Beijing and Moscow work together in?

- "the past is made of multitudinous items ranging from anything that can be collected, recollected or assessed to originate in the past. as such, the past is a gallimaufry of particulars that may not have been related in any way. however, the human mind seeks organization to understand concepts and other things. the human mind therefore seeks relationships in explaining and studying the past. history being a humanity, dictates that historians have to serve this human trait by bringing structure to details of the past. historians do this by creating interpretive frameworks that capture as many details as possible."

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from the conditions of the working class in england by friedrich engels,the main idea is :

do u have any answer choices man?

the answer is b: an economic crisis throughout the country.