单项选择题

People who are cognitively healthy are those

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

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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

What is the passage mainly about

A．How biochemical changes occur in the human brain.
B．Why biochemical changes Occur in the human brain.
C．How intellectual activities influence brain-cell health.
D．Why people should keep active not only physically but also mentally.