C．Overall productivity increases·
D．More raw materials become necessary．
22．It can be inferred from the passage that by 1870______．
A．the steam engine had been invented
B．a nationalcommission on agriculture had been established
C．the U．S．horse population was about 10 million
D．technology began to be more economical
23．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 a almost always successful．
C．Technicians are more useful to society than economists．
D．The economy is independent of technological transformation．
24．In the second paragraph，the author suggests that“economists’would_____.
A．consult the national commission on the economy
B．
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