单项选择题

A．modes
B．manners
C．methods
D．routines
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单项选择题
A．levelB．gradeC．strengthD．standard
A．level
B．grade
C．strength
D．standard
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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