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(D)
Blood flow(血流)to the brain is very important for thinking and memory. The brain carefully controls this flow, but small changes can still happen. Short - term drops in blood flow can make thinking and memory worse for a short time. Long - term drops might increase the risk of develop - ing dementia. Sitting for a long time can reduce blood flow to the legs, but it was not clear whether it affects (影响) blood flow to the brain or not.
To find out, researchers at Oxford University in England did a new study with 15 healthy adult office workers. The workers wore special headbands to measure blood flow to the brain. Over four hours, they did three different activities: In one, they sat the whole time except for bathroom breaks; In another, they walked on a treadmill(跑步机)for two minutes every half - hour; And in the last one, they walked for eight minutes after sitting for two hours. This helped the researchers see how blood flow changed in different situations.
The results showed that sitting for long periods can reduce blood flow to the brain, which may affect long - term brain health. However, taking a two - minute walk every half - hour can help maintain(维持)or even increase brain blood flow.
The study also found that changes in blood flow were not caused by carbon dioxide (二氧化碳) levels or breathing, which stayed the same. This means that sitting and moving affect blood flow in other ways.
So something else about sitting and moving was changing how blood got to the brain. The study also showed that breaks can be short but should be taken often. Your brain might thank you years later when you’re not sitting in an office chair all the time.
根据短文内容,判断下列句子正(T)、误(F)。(5 分)
(
(
(
(
(
Blood flow(血流)to the brain is very important for thinking and memory. The brain carefully controls this flow, but small changes can still happen. Short - term drops in blood flow can make thinking and memory worse for a short time. Long - term drops might increase the risk of develop - ing dementia. Sitting for a long time can reduce blood flow to the legs, but it was not clear whether it affects (影响) blood flow to the brain or not.
To find out, researchers at Oxford University in England did a new study with 15 healthy adult office workers. The workers wore special headbands to measure blood flow to the brain. Over four hours, they did three different activities: In one, they sat the whole time except for bathroom breaks; In another, they walked on a treadmill(跑步机)for two minutes every half - hour; And in the last one, they walked for eight minutes after sitting for two hours. This helped the researchers see how blood flow changed in different situations.
The results showed that sitting for long periods can reduce blood flow to the brain, which may affect long - term brain health. However, taking a two - minute walk every half - hour can help maintain(维持)or even increase brain blood flow.
The study also found that changes in blood flow were not caused by carbon dioxide (二氧化碳) levels or breathing, which stayed the same. This means that sitting and moving affect blood flow in other ways.
So something else about sitting and moving was changing how blood got to the brain. The study also showed that breaks can be short but should be taken often. Your brain might thank you years later when you’re not sitting in an office chair all the time.
根据短文内容,判断下列句子正(T)、误(F)。(5 分)
(
F
)71. Blood flow to the brain is important for harming thinking and memory.(
F
)72. Sitting for a long time can affects blood flow to the brain and reduce it to the legs.(
T
)73. Walking on a treadmill for two minutes every half - hour can increase brain blood flow.(
F
)74. Changes in blood flow were caused by carbon dioxide levels or breathing.(
T
)75. We can learn that sitting and moving was changing how blood got to the brain from the passage.答案
71.F 72.F 73.T 74.F 75.T
解析
【分析】
做这类判断正误题的核心思路是：先定位每个小题对应的原文语句，再对比题目表述与原文是否完全一致，重点关注关键词的替换、逻辑的颠倒或概念的偷换，避免主观臆断，严格依据原文信息判断。
【解析】
71题：原文第一段明确提到“Blood flow to the brain is very important for thinking and memory”，而题目表述为“对损害思维和记忆重要”，与原文语义完全相反，故判断为F。
72题：原文第一段说明“久坐可减少腿部血流，但不确定是否影响脑部血流”，题目直接表述为“能影响脑部血流”，与原文“不确定”的表述不符，故判断为F。
73题：原文第三段指出“每半小时走两分钟能维持甚至增加脑部血流”，与题目表述一致，故判断为T。
74题：原文第四段明确提到“脑部血流变化并非由二氧化碳水平或呼吸导致”，题目表述为“由二氧化碳水平或呼吸导致”，与原文相反，故判断为F。
75题：原文最后一段提到“关于久坐和运动的其他因素改变了血液流向大脑的方式”，与题目表述一致，故判断为T。
【答案】
71.F 72.F 73.T 74.F 75.T
【知识点】
英语阅读理解、细节理解题
【点评】
本题为科普类阅读理解的判断正误题型，主要考查学生对文章细节信息的定位与辨析能力，难度适中，只要仔细对照原文与题目表述即可准确判断。
【难度系数】
0.7
做这类判断正误题的核心思路是：先定位每个小题对应的原文语句，再对比题目表述与原文是否完全一致，重点关注关键词的替换、逻辑的颠倒或概念的偷换，避免主观臆断，严格依据原文信息判断。
【解析】
71题：原文第一段明确提到“Blood flow to the brain is very important for thinking and memory”，而题目表述为“对损害思维和记忆重要”，与原文语义完全相反，故判断为F。
72题：原文第一段说明“久坐可减少腿部血流，但不确定是否影响脑部血流”，题目直接表述为“能影响脑部血流”，与原文“不确定”的表述不符，故判断为F。
73题：原文第三段指出“每半小时走两分钟能维持甚至增加脑部血流”，与题目表述一致，故判断为T。
74题：原文第四段明确提到“脑部血流变化并非由二氧化碳水平或呼吸导致”，题目表述为“由二氧化碳水平或呼吸导致”，与原文相反，故判断为F。
75题：原文最后一段提到“关于久坐和运动的其他因素改变了血液流向大脑的方式”，与题目表述一致，故判断为T。
【答案】
71.F 72.F 73.T 74.F 75.T
【知识点】
英语阅读理解、细节理解题
【点评】
本题为科普类阅读理解的判断正误题型，主要考查学生对文章细节信息的定位与辨析能力，难度适中，只要仔细对照原文与题目表述即可准确判断。
【难度系数】
0.7
