单项选择题

The word "subjects" in paragraph 5 means ______.

A．something to be considered
B．branches of knowledge studied
C．persons chosen to be studied in an experiment
D．any member of a state except the supreme ruler

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热门试题

单项选择题

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.

单项选择题

The doctor's tests show that ______.

A．our brains shrink as we grow older
B．the front section of the brain does not shrink
C．sixty-year-olds have better brains than thirty-year-olds
D．some people’s brains have contracted more than other people’s