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The pH of polluted rainwater ranges from about 6 to just below
C.NG

A.Y
B.N

【参考答案】

B
解析：题干中的信息词“pH”是查找本题的依据。第6副标题第1段最后说“The pH of unpollute......

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A land free from destruction, plus wealth, natural resources, and labor supply--all these were important【C1】______in helping England to become the center for the Industrial Revolution;【C2】______they were not enough. Something【C3】______was needed to start the industrial process. That 'something special' was men -【C4】______individuals who could invent machines, find new【C5】______of power, and establish business organizations to reshape society.The men who【C6】______the machines of the Industrial Revolution【C7】______from many backgrounds and many occupations. Many of them were【C8】______inventors than scientists. A man who is a【C9】______scientist is primarily interested in doing his research【C10】______. He is not necessarily working【C11】______that his findings can be useD.An inventor or one interested in applied science is【C12】______trying to make something that has a concrete【C13】______. He may try to solve a problem by using the theories【C14】______science or by experimenting through trial and error. Regardless of his method, he is working to obtain a【C15】______result: the construction of a harvesting machine, the burning of a light bulb, or one of【C16】______other objectives.Most of the people who【C17】______the machines of the Industrial Revolution were inventors, not trained scientists. A few were both scientists and inventors. Even those who had【C18】______or no training in science might not have made their inventions【C19】______a groundwork had not been laid by scientists years【C20】______.【C1】A.casesB.reasonsC.factorsD.situations
A.B.
C.
D.
【C1】
A.cases
B.reasons
C.factors
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