单项选择题

The doctor's test show that ______.

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

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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

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