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

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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.

单项选择题

In the second paragraph, the author suggests that economists would ______.

A．consult the national commission on the economy
B．plan the economy through yearly forecasts
C．consider the influence of technological innovation important
D．value the economic contribution of farm animals