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

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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 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