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  3. A land free from destruction, plus wealth, natural resources, and labor supply—all these were important factors, in helping Engl

A land free from destruction, plus wealth, natural resources, and labor supply—all these were important factors, in helping Engl

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问题     A land free from destruction, plus wealth, natural resources, and labor supply—all these were important factors, in helping England to become the center for the Industrial Revolution.【31】they were not enough. Something else was needed to start the industrial process. That "something special" was men―【32】individuals who could invent machines, find new sources of power, and establish business organizations to reshape society.
    The men who【33】the machines of the Industrial Revolution came from many backgrounds and many occupations. Many of them were【34】inventors than scientists. A man who is a pure scientist is primarily interested in doing his research【35】. He is not necessarily working so that his findings can be used. An inventor or one interested in applied science is【36】trying to make something that has a concrete idea. He may try to solve a problem by using the theories【37】science or by experimenting through trial and error. Regardless of his method, he is working to obtain a specific result: the construction of a harvesting machine, the burning of a light bulb, or one of【38】other objectives.
    Most of the people who developed the machines of the Industrial Revolution were inventors, not trained scientists. A few were both scientists and inventors. Even those who had【39】or no training in science might not have made their inventions if a groundwork had not been laid by scientists years【40】.
选项 A、ago
B、past
C、ahead
D、before
答案A
解析 本句意思是：若不是科学家们多年前就打下了基础，那些很少或没有受过科学训练的人也许不会进行他们的发明创造。这儿需要的意思是“在……之前”，涉及的时间概念是“过去的过去”，因此只能选用“ago”。
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