What are their research findings based on?(本题1.0分)
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.
出自:河北建筑工程学院-电气工程及其自动化-大学英语3(专升本)

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