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

The team of doctors wanted to find out

A．why certain people are aging sooner than others
B．how to make people live longer
C．the size of certain people's brains
D．which people are most intelligent