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单选题
A

cough

B

headache

C

fever

D

cold


参考答案

参考解析
解析:
由标题可知本文主要讨论感冒(cold),而在空格所在句子之前,描述的均是感冒的症状。在第一段第五句文章又提到“Some kids have up to eight colds every year”,即一些孩子一年感冒可达八次,可知本题答案应该为D项cold。
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