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

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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.

单项选择题

A．information that haveB．information they haveC．information that hasD．information that was

A．information that have
B．information they have
C．information that has
D．information that was