A study has proven old people who are eaters of fish during their youth lose fewer brain c

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(答案→)A. regular
B. mon
C. special
D. proper
解析：考查单词意思，regular意思“有规律的”，mon意思“普通的”， special意思“专门的”，proper意思“合适的”，句子意思“一项研究已经证明在年轻时期有规律的吃鱼的老人脑细胞很少丢失”，所以选A