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It can be inferred from the passage that by 1870 ______.A.the steam engine had been inventedB.a national commission on agriculture had been establishedC.the U.S.horse population was about 10 millionD.technology began to be more economical

A.A.the
B.a
C.the
D.S.horse
E.technology

【参考答案】

A
A
[注释] 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，......

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