单项选择题

People who are cognitively healthy are those______.

A．whose minds are alert and receptive
B．who are highly intelligent
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

The findings of James and other scientists in their work______.

A．remain a theory to be further proved
B．have been challenged by many other experts
C．are practiced by the researchers themselves
D．have been generally accepted

单项选择题

What is the passage mainly about

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