单项选择题

Which of the following does the author mention as describing negative conditions in the meat- packing industry

A．A recent history of the meat-packing industry.
B．Historical sources for the late nineteenth century.
C．Data from some researchers.
D．Workers who used to work in the meat-packing industry.
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单项选择题
The working conditions of skilled workers in the meat-packing industry during the 1880’s were influenced by
A．the efforts of social workers to improve sanitation in the packinghouses.
B．improvements in the industry’s packing process that occurred in the 1880’s.
C．the workers’ ability to perform the industry’s complex tasks.
D．the workers’ determined complaints about the rate and conditions of their work.
单项选择题
The second paragraph is used to
A．present evidence that is intended to refute the argument of the history discussed.
B．summarize the main point of the history discussed in the passage.
C．explain why the history discussed in the passage has been blamed by critics.
D．introduce a hypothesis that will be discussed in detail later in the passage.
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