第10题: [单项选择]The research findings based on ______. A. a survey of Japanese farmers B. the study of brain volumes of different people C. tests performed on a thousand old people D. the latest development of computer technology 参考答案:C 答案解析:细节题。由文章第二段第二句可知,医生的研究建立在对1000个不同年龄和不同大脑体积的人的调查之上,所以C正确。