单项选择题

案例分析题 The underlined word "subjects" in paragraph 5 means ______.

A．branches of knowledge studied in a school
B．something to be considered
C．persons experimented on
D．citizens in a country
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单项选择题
The professor's tests show that ______.
A．our brains shrink as we grow old
B．the front section of the brain does not shrink
C．seventy-year-olds have better brains than sixty-year-olds
D．brain contraction may vary among people of the same age
单项选择题
Faulkner's research findings are based on______.
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
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