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单项选择题

Which of the following is NOT mentioned by the author as a consequence of new technological developments

A．Older technologies die away.
B．The quality of life is improved.
C．Overall productivity increases.
D．More raw materials become necessary.

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单项选择题It can be inferred from the passage that by 1870 ______.

A．the steam engine had been invented
B．a national commission on agriculture had been established
C．the U.S. horse population was about 10 million
D．technology began to be more economical

单项选择题Which of the following statements would the author of the passage be most likely to agree

A．Technological development influences society's future.
B．Technological innovations are almost always successful.
C．Technicians are more useful to society than economists.
D．The economy is independent of technological transformation.