单项选择题

What is the author's attitude toward changes brought on by technological innovation

A．He is excited about them.
B．He is disturbed by them.
C．He questions their usefulness.
D．He accepts them as natural.
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单项选择题
Which of the following is NOT mentioned by the author as a consequence of new technological developments
A．Older technologies die away.
B．The quality of life is improved.
C．Overall productivity increases.
D．More raw materials become necessary.
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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