题目内容
The word "these" in line 20 refers to（）
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The (poor )condition of (prisoners are ) what (concerned) Dorothea Dix, an American social worker and (director of) a school ill Boston.（）
The brain of an average adult is one of the largest organs of the body（）about three pounds.
The word "exercise" in line 15 is closest in meaning to（）
All of the following are mentioned in the passage as reasons for the increased demand for cotton EXCEPT（）
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