单项选择题

What is the passage mainly about

A．How biochemical changes occur in the human brain.
B．Why people should keep active not only physically but also mentally.
C．How intellectual activities influence brain-cell health.
D．Why people should receive special mental training as they ag

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单项选择题

Older people are generally advised to______.

A．keep fit by going in for physical activities
B．keep mentally active by challenging their brains
C．maintain mental alertness through specific training
D．maintain a balance between individual and group activities

单项选择题

People who are cognitively healthy are those______.

A．who can remember large amounts of information
B．who are highly intelligent
C．whose minds are alert and receptive
D．who are good at recognizing different sounds