单项选择题

According to Stoker, sign language is______.

A．an international language
B．a substandard language
C．an artificial language
D．a genuine language
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单项选择题
What aspect of life in the United States does the passage mainly discuss
A．The transition from an agricultural to an industrial economy.
B．The inventions that transformed life in the nineteenth century.
C．The problems associated with the earliest factories.
D．The difficulty of farm life in the nineteenth century,
单项选择题
What does the author mean when stating that certain inventions made farming capital-intensive rather than labor-intensive (Line 7, Para. 3)
A．Workers had to be trained to operate the new machines.
B．Mechanized farming required more capital and fewer laborers.
C．The new inventions were not helpful for all farming activities.
D．Human labor could still accomplish as much work as the first machines.
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