hce_nchu
114年
英文
第 33 題
📖 題組：
Recent wildfires in the Los Angeles area have highlighted a growing concern beyond immediate physical destruction: the complex relationship between wildfire smoke and human cognitive function. While the immediate impacts of these fires—including casualties, displacement, and property destruction—are evident, researchers are increasingly focused on understanding the long-term neurological and psychological effects of wildfire smoke exposure. Studies have revealed that wildfire smoke contains fine particulate matter (PM2.5) that is significantly more toxic than typical air pollution. These particles, characterized by high levels of polycyclic aromatic hydrocarbons (PAHs) mixed with various neurotoxic elements including heavy metals, can reach the brain through multiple pathways. They either pass directly through the olfactory nerve, penetrate the blood-brain barrier, or modulate the nervous system, ultimately leading to brain inflammation and oxidative stress. The evidence for neurological impact is particularly striking, as demonstrated by a collaborative study from the Universities of Washington and Pennsylvania, which revealed that for every 1 microgram increase in wildfire particle concentration, the odds of a new dementia diagnosis rose by approximately 21%, compared to just a 3% increased risk for non-wildfire particles. Additional research from the University of New Mexico has shown that sudden spikes in air pollution create surges of inflammation in the hippocampus—the brain region responsible for memory and learning—which can persist for over a month after exposure. The relationship between smoke exposure and cognitive function has been documented through various empirical studies. A comprehensive analysis conducted at UC San Diego examined the impact of smoke on academic performance by studying China's national college entrance examinations over a six-year period. The research specifically focused on smoke from routine, controlled agricultural fires, methodologically isolating cognitive effects from the anxiety associated with evacuation concerns. The findings revealed that significant increases in upwind fires during examination periods led to measurable decreases in student performance, with scores dropping by an average of 0.6 points. These cognitive effects have substantial economic implications, with a 2022 US study estimating that smoke exposure in 2016 alone reduced students' future earnings by approximately $1.7 billion. The psychological impact of wildfires presents another dimension of concern. Studies of communities affected by major fires, such as the 2018 Camp Fire in California, reveal complex patterns of mental health effects. Even individuals not directly impacted by the fires reported increased neurocognitive issues and struggled with depression and anxiety. Researchers have also documented a phenomenon known as solastalgia—the distress of witnessing one's environment change rapidly—among residents in fire-prone regions, highlighting the interconnected nature of physical exposure and psychological well-being.
Recent wildfires in the Los Angeles area have highlighted a growing concern beyond immediate physical destruction: the complex relationship between wildfire smoke and human cognitive function. While the immediate impacts of these fires—including casualties, displacement, and property destruction—are evident, researchers are increasingly focused on understanding the long-term neurological and psychological effects of wildfire smoke exposure. Studies have revealed that wildfire smoke contains fine particulate matter (PM2.5) that is significantly more toxic than typical air pollution. These particles, characterized by high levels of polycyclic aromatic hydrocarbons (PAHs) mixed with various neurotoxic elements including heavy metals, can reach the brain through multiple pathways. They either pass directly through the olfactory nerve, penetrate the blood-brain barrier, or modulate the nervous system, ultimately leading to brain inflammation and oxidative stress. The evidence for neurological impact is particularly striking, as demonstrated by a collaborative study from the Universities of Washington and Pennsylvania, which revealed that for every 1 microgram increase in wildfire particle concentration, the odds of a new dementia diagnosis rose by approximately 21%, compared to just a 3% increased risk for non-wildfire particles. Additional research from the University of New Mexico has shown that sudden spikes in air pollution create surges of inflammation in the hippocampus—the brain region responsible for memory and learning—which can persist for over a month after exposure. The relationship between smoke exposure and cognitive function has been documented through various empirical studies. A comprehensive analysis conducted at UC San Diego examined the impact of smoke on academic performance by studying China's national college entrance examinations over a six-year period. The research specifically focused on smoke from routine, controlled agricultural fires, methodologically isolating cognitive effects from the anxiety associated with evacuation concerns. The findings revealed that significant increases in upwind fires during examination periods led to measurable decreases in student performance, with scores dropping by an average of 0.6 points. These cognitive effects have substantial economic implications, with a 2022 US study estimating that smoke exposure in 2016 alone reduced students' future earnings by approximately $1.7 billion. The psychological impact of wildfires presents another dimension of concern. Studies of communities affected by major fires, such as the 2018 Camp Fire in California, reveal complex patterns of mental health effects. Even individuals not directly impacted by the fires reported increased neurocognitive issues and struggled with depression and anxiety. Researchers have also documented a phenomenon known as solastalgia—the distress of witnessing one's environment change rapidly—among residents in fire-prone regions, highlighting the interconnected nature of physical exposure and psychological well-being.
Based on the research findings, what is the most accurate characterization of the cognitive effects of wildfire smoke exposure?
- A The effects manifest only during active exposure to smoke.
- B Pre-existing cognitive conditions determine vulnerability to effects.
- C The impacts are most severe in particular age demographics.
- D Cognitive impairment shows a dose-dependent relationship with exposure.
思路引導 VIP
請觀察第二段關於失智症風險的百分比，以及第三段關於學生成績的研究：當「懸浮微粒濃度」或「火災頻率」這些投入量增加時，對應的「健康風險」或「表現損害」呈現出什麼樣的連動規律？這種規律如何用一個詞來描述其強度與結果的比例關係？
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AI 詳解
AI 專屬家教
太棒了！你能精準捕捉到文中數據與現象之間的邏輯關聯，這代表你對長篇學術性文章的掌握非常扎實。這題的正確答案為 (D)，反映了科學研究中核心的「量化關係」。
劑量與反應的關聯性 (Dose-Dependent Relationship)
文中提到，野火微粒（PM2.5）每增加 $1$ 微克，失智症診斷率就上升約 $21%$；同時在關於考試表現的研究中，上風處火災的增加也與學生成績下降有直接關聯。這種「暴露程度增加，負面影響也隨之加劇」的現象，在科學上被稱為劑量反應關係 (dose-dependent relationship)。選項 (D) 成功地將文中的具體數據（如百分比與分數變化）歸納為抽象的科學概念，是解答本題的關鍵。
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