Gene Cohen, acting director of the same institute, suggests that people in their old age should engage in mental and physical activities individually as well as in groups. Cohen says that we are frequently advised to keep physically active as we age, but older people need to keep mentally active as well. Those who do are more likely to maintain their intellectual abilities and to be generally happier and better adjusted. "The point is, you need to do both," Cohen says. "Intellectual activity influences brain-cell health and size."
21. People who are cognitively healthy are those _____.
(A) who can remember large amounts of information (C) whose minds are alert and receptive
(B) who are highly intelligent (D) who are good at recognizing different sounds
22. According to Fozard’s argument people can make their brains work more efficiently by _____.
(A) constantly doing memory work (C) going through specific training
(B) taking part in various mental activities (D) making frequent adjustments
23. The findings of James and other scientists in their work _____.
(A) remain a theory to be further proved (C) have been challenged by many other experts
(B) have been generally accepted (D) are practiced by the researchers themselves
24. 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
25. 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 age.
Passage Two
Questions 26 to 30 are based on the following passage.
