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．

 << 上一页  [21] [22] [23] [24] [25] [26] [27] [28] [29] [30]  ... 下一页  >>