23. 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 practised by the researchers themselves
D) have been generally accepted
注:第三段首句中的theory等同于findings
Many experts are so convinced of the benefits of challenging the brain that they are putting the theory to work in their own lives. The idea is not necessarily to learn to memorize enormous amounts of information, says James Fozard, associate director of the National Institute on Aging. Most of us dont need that kind of skill. Such specific training is of less interest than being able to maintain mental alertness. Fozard and others say they challenge their brains with different mental skills, both because they enjoy them and because they are sure that their range of activities will help the way their brains work.
25. 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-cell health.
D) Why people should keep active not only physically but also mentally.
注:not only... but also... 为优选项,且重点在 but also 部分。D 项为首句主题句的同义改写
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