The men who __21__ the machines of Industrial Revolution __22__ from many backgrounds and many occupations. Many of them were __23__ inventors than scientists. A man who is a __24__ scientist is primarily interested in doing his research __25__. He is not necessarily working __26__ that his findings can be used.

　　An inventor or anyone interested in applied science is __27__ trying to make something that has a concrete __28__. He may try to solve a problem by using the theories __29__ science or by experimenting through trial and error. Regardless of his method, he is working to get a __30__ result: The construction of a harvesting machine, the burning of a light bulb, or one of __31__ other objectives.

　　Most of the people who __32__ the machines of the Industrial Revolution were inventors, not trained scientists.

　　A few were both scientists and inventors. Even those who have __33__ or no training in science might not have made their inventions __34__ the groundwork (基础工作) had not been laid by scientists years __35__.

　　16．A.cases

　　B．reasons

　　C．factors

　　D．situations

　　答案：C　本句列举了英国成为工业革命中心的因素。A项意为“情况；例子”；B项意为“原因”；C项意为“因素”；D项意为“形势”。从句意看，这些都是天时地利的因素。

　　17．A.But

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