The passage is primarily concerned with discussing ______. The author of the passage mentions all of the following as describin

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问题 The passage is primarily concerned with discussing ______.
The author of the passage mentions all of the following as describing negative conditions in the meat-packing industry EXCEPT ______.

选项 A、data from the University of Chicago
B、a recent history of the meat-packing industry
C、social workers
D、historical sources for the late nineteenth century

答案B

解析 A选项的内容在第二段"Additional data from the University of Chicago suggest that the packing houses were dangerous places to work"提到;C选项的内容在第二段"The government investigation...found the packinghouses unsanitary,while social workers observed that most of the workers were poorly paid and overworked"提到;D选项的内容在第二段"...other historical sources for the late nineteenth century record deteriorating housing and high disease and infant mortality rates..."提到。只有B不是文章中提到的不利状况。
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