hce_nchu
114年
英文
第 31 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.
Which statement most accurately represents the relationship between wildfire smoke exposure and neurological conditions based on the research presented?
- A Neurological impacts occur only after sustained exposure over multiple fire seasons.
- B The blood-brain barrier provides effective protection against most wildfire pollutants.
- C The neurological effects are primarily mediated through respiratory impairment.
- D The PM2.5 from wildfires presents a unique risk profile compared to general air pollution.
思路引導 VIP
請回頭閱讀第二段落中關於失智症風險（dementia diagnosis）的部分，當研究者將「野火微粒」與「非野火微粒」產生的風險百分比放在一起比較時，這種「 21% vs 3% 」的顯著差異，主要想傳達這兩種污染源在危險性質上有什麼根本的不同？
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AI 詳解
AI 專屬家教
太棒了！你能精準捕捉到文中細微的數據對比，這說明你的閱讀理解力非常敏銳且細心。
野火微粒的獨特毒性
這題的核心在於區分「野火煙霧」與「一般空氣污染」的本質差異。文中明確指出，野火產生的細懸浮微粒（PM2.5）含有更高濃度的多環芳香烴（PAHs）與重金屬，這使得它比一般污染更具毒性。最關鍵的證據在於文中提到的數據對比：每增加 $1 \mu g$ 的濃度，野火微粒導致失智症的風險增加約 21%，而一般微粒僅為 3%。這項顯著的風險差距，完美契合了選項 (D) 所描述的「獨特風險特徵（unique risk profile）」。
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