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题目内容 (请给出正确答案)
单选题
The author’s main purpose in writing the last paragraph of the passage was to ______.
A

explain how cold viruses are transmitted

B

prove that a poor diet causes colds

C

discuss the relationship between income and frequency of colds

D

analyze the distribution of income among the people in the study


参考答案

参考解析
解析:
细节题。最后一段首句为总领句,该句指出“研究还发现经济条件也扮演一个重要角色”。接下来第二句描述了随着家庭收入的增加,患感冒的次数也会减少。由此可知该段主要描述收入水平和患感冒频度之间的联系,因此正确答案为C项。
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