单项选择题

The word "subjects" in paragraph 4 means ______.

A．something to be considered
B．branch 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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单项选择题

According to the passage, which people seem to age slower than the others'.

A．Lawyers
B．Farmers
C．Clerks
D．Shop assistants

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.