大学英语四级考试阅读笔记(24)
C) going through specific training
D) taking part in various mental activities
注：考第三段末句
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 don't 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.
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 don't 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
Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act more effectively in cognitive (认知的) areas such as attention and memory. This is true regardless of age.
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Questions 36 to 40 are based on the following passage:
36. Plants will emit an increased amount of heat when they are _________.
A) sprayed with pesticides
B) in poor physical condition
C) facing an infrared scanner
D) exposed to excessive sun rays
注：when /as/ if 为条件句引导词，定位条件句
37. In order to apply pesticide spraying precisely, we can use infrared scanning to _________.
A) locate the problem area
B) draw a color-coded map
C) measure the size of the affected area
D) estimate the damage to the crops
38. Farmers can save a considerable amount of pesticide by _________.
A) transforming poisoned rain
B) consulting infrared scanning experts
C) resorting to spot-spraying
D) detecting crop problems at an early date
39. The application of infrared scanning technology to agriculture met with some difficulties due to ______.
A) the lack of official support
B) its high cost
C) its failure to help increase production
D) the lack of financial support
注：考因果关系
40. Infrared scanning technology may be brought back into operation because of ________.
A) growing concern about the excessive use of pesticides on crops
B) the desire of farmers to improve the quality of their produce
C) the forceful promotion by the Department of Agriculture
D) full support from agriculture experts
注：back into operation 重操旧业
Even plants can run a fever, especially when they're under attack by insects or disease. But unlike humans, plants can have their temperature taken from 3, 000 feet away - straight up. A decade ago, adapting the infrared (红外线) scanning technology developed for military purposes and other satellites, physicist Stephen Paley came up with a quick way to take the temperature of crops to determine which ones are under stress. The goal was to let farmers precisely target pesticide (杀虫剂) spraying rather than rain poison on a whole field, which invariably includes plants that don't have pest (害虫) problems.
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