21. People who are cognitively healthy are those _____.
who can remember large amounts of information whose minds are alert and receptive
who are highly intelligent who are good at recognizing different sounds
22. According to Fozards argument people can make their brains work more efficiently by _____.
constantly doing memory work going through specific training
taking part in various mental activities making frequent adjustments
23. The findings of James and other scientists in their work _____.
remain a theory to be further proved have been challenged by many other experts
have been generally accepted are practiced by the researchers themselves
24. Older people are generally advised to _____.
keep fit by going in for physical activities
keep mentally active by challenging their brains
maintain mental alertness through specific training
maintain a balance between individual and group activities
25. What is the passage mainly about?
How biochemical changes occur in the human brain.
Why people should keep active not only physically but also mentally.
How intellectual activities influence brain-cell health.
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★ 2013年6月六级真题阅读理解Section B原文+答案解析
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