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  3. Which of the following is NOT mentioned by the author as a consequence of new technological developments? It can be inferred fr

Which of the following is NOT mentioned by the author as a consequence of new technological developments? It can be inferred fr

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问题 Which of the following is NOT mentioned by the author as a consequence of new technological developments?
It can be inferred from the passage that by 1870 ______.
选项 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
答案A
解析 根据第二段开始部分，1870年时马和骡子为美国农场的主要劳动力，尽管那时已出现蒸汽机。其他选项的信息有误或没有在短文中涉及。
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