D. The use of machines producing parts of the same standard.

　　69. The underlined word this in the first paragraph refers to ____

　　A. the use of scientific findings

　　B. the practice of producing the same parts for a product

　　C. the human power being replaced by other forms of energy

　　D. the technology becoming the encouragement of historical change

　　70.The underlined word this in the second paragraph refers to the change that ______

　　A. each nail could be taken the place of by every other nail

　　B. each nail was exactly like every other nail

　　C. producing tasks became smaller and smaller

　　D. goods could be mass produced

　　71.According to the writer, highly skilled workers ______

　　A. completely disappeared with the coming of the factory system

　　B. were dismissed by the boss

　　C. were unable to produce goods of high standard

　　D. were unable to produce fine goods at that same speed as machines

　　72.According to the passage, what did the farmers have to do with the coming of mechanization of agriculture?

　　A. Many of them had to leave their farmland for industrial centers.

　　B. They stuck to their farm work.

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