单项选择题

A land free from destruction, wealth, natural resources, and labor supply--all these were important (21) in helping England to become the center for the Industrial Revolution. (22) they were not enough. Something (23) was needed to start the industrial process. That "something special", was men (24) individuals who could invent machines, find new (25) of power, and establish business organizations to reshape the society.
The men who (26) the machines of the Industrial Revolution (27) from many backgrounds and many occupations. Many of them were (28) inventors than scientists, A man who is a (29) scientist is primarily interested in doing his research (30) . He is not necessarily working (31) that his findings can be used.
An inventor or one interested in applied science is (32) trying to make something that has a concrete (33) He tries to solve a problem by following the theories (34) science or by experimenting through trial and error. Regardless of his method, he is working to obtain a (35) result: the construction of a harvesting machine, the burning of a light bulb, or one of (36) other objectives.
Most of the people who (37) the machines of the Industrial Revolution were inventors. A few were both scientists and inventors. Even those who had (38) or no training in science might have made their inventions, (39) a groundwork had been laid by scientists years (40) .