单选题
On what are their research findings based?
A、
A survey of farmers in northern Japan.
B、
Tests performed on a thousand old people.
C、
The .study of brain volumes of different people.
D、
The latest development of computer technology.
【正确答案】
C
【答案解析】
[解析] “He set about measuring brain volumes of a thousand people of different ages and varying occupations．”从这句话可以得知调查是在不同人身上进行的，所以选择C。
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