新闻听力 | 发烧虽难受，但非坏事
发烧虽难受，但非坏事Fever Feels Horrible, but Is Actually Awesome 常速| 六级 标准 | 1572词 | 9min29s刘立军供稿Part I. QUESTIONSListen to the passage and choose the best answer to each question you hear.Q1. What is the text’s explanation for why human bodies maintain a temperature of around 37°C?A. It minimizes energy expenditure.B. It optimizes cellular function and increases resistance to fungal infections.C. It facilitates the reproduction of beneficial bacteria.D. It allows the body to adapt to fluctuating environments.Q2. What role does fever play in the immune system’s response to infection?A. It raises body temperature to eliminate toxins.B. It makes the body uncomfortable to encourage rest.C. It heats the body to stress and kill invaders.D. It cools the body to prevent overheating.Q3. How do pyrogens initiate a fever response in the body?A. By increasing the body’s energy reserves.B. By directly attacking invading microbes.C. By reducing blood flow to the skin’s surface.D. By passing into the brain and raising the internal thermostat.Q4. How does the fever-induced rise in body temperature specifically impact bacteria?A. It increases their reproduction rate.B. It decreases their cellular stress levels.C. It causes damage to their DNA and proteins.D. It allows them to adapt to higher temperatures.Q5. What key aspect of the immune system is improved during a fever, as mentioned in the text?A. More efficient attack by immune cells like neutrophils and killer cells.B. Enhanced production of antibodies.C. Quicker healing of damaged tissues.D. Increased metabolism to provide more energy.Q6. What triggers the production of heat shock proteins (HSPs) in your cells during a fever?A. Excessive exposure to cold temperatures.B. Increased cellular stress due to elevated temperatures.C. Invasion by specific types of bacteria.D. Inhibition of the immune response.Q7. Why might evolution favor pathogens that can overcome fever?A. They can infect a wider range of hosts.B. They can replicate faster in the host body.C. They can survive in extreme temperature conditions.D. They become more competitive in infecting new, healthy hosts.Q8. According to the text, why do some serious pathogens like the measles virus adopt “hit and run" tactics?A. To avoid strong immune responses before fever can effectively kill them.B. To mutate rapidly and avoid detection.C. To spread infections more efficiently during the fever phase.D. To destroy a host's immune system faster.Q9. What is one reason why fever-reducing medications might not be beneficial for recovering from certain diseases like influenza?A. They enhance the replication of viruses.B. They can cause harmful side effects.C. They do not accelerate the healing process.D. They prevent the immune system from functioning effectively.Q10. How does the author suggest people should approach treating a fever with medication?A. Always avoid using fever reducers.B. Only use medication if the fever exceeds 40°C.C. Speak to a doctor to determine the best course of action.D. Rely on internet sources for advice.Part II. TRANSCRIPTFever Feels Horrible, but Is Actually AwesomeFever feels bad, so we take medication to suppress it ― but is this a good idea? It turns out fever is one of the oldest defenses against disease. What exactly is it, how does it make your immune defense stronger, and should you take a pill to combat it?The Heat of LifeOn Earth, life is able to thrive between the extremes of -10°C in deep cool pools and 120°C in thermal vents. Step outside this range and die. Every animal or microbe has a temperature range that is ideal and one that is stressful but survivable for a while. Your ideal temperature is where your cells work best, where their internal machinery is the most efficient and the animal as a whole the best adapted to its niche. (Q1) Humans are warm-blooded animals, and our bodies expend a lot of energy to keep us around 37°C or 98.6°F, which seems wasteful, but this may actually be a defensive adaptation ― our temperature makes us almost entirely immune to one of the worst killers and parasites: fungi. Most colder animals and their insides are infected by them, but you are just too hot, which brings us to fever. For any microbe that wants to infect you, your body is a world they want to conquer.niche n. 生态位，适合的位置fungi n. （fungus的复数）真菌(Q2) Fever is defensive climate change pushing an invader outside its ideal temperature range and making the world horrible. It evolved at least 600 million years ago and is widespread: most animals increase their core temperature when they are sick. Fish swim into warmer waters; lizards bathe in the sun. Bees heat up the air inside their hive. But you, warm blooded mammal, you have way more drastic options. Let’s make you sick and see what happens.lizard n. 蜥蜴When Your Blood Turns into LavaYou’re invaded by bacteria and viruses at the same time. The invasion is powerful, and you need to slow it down as fast as possible. Fever is part of your first line of defense, triggered by a diverse group of chemicals called “pyrogens”, “The creators of heat”. (Q3) They float away from the battlefield and pass right into your brain, where specialized receptors pick them up and crank up your internal thermostat. First, you begin to shiver. Your skeletal muscles contract really quickly, which generates a lot of heat in your core. At the same time, usually the blood vessels near your surfaces contract and prevent heat from escaping through your skin. Your skin cools down while your insides burn.thermostat n. 恒温器，温度调节器Fever is a systemic, body-wide response and is a serious energy investment for your body. You burn about 10% more calories to stay alive for every degree centigrade your body temperature rises. Fever is also a strong order to lay down and rest, to save energy and give your immune system time to fight.Back to the battlefield: When the bacteria entered your body, they tried to be stealthy. But now they have switched into high production mode. Their goal is to multiply as fast as possible, which means they need a lot of resources and are highly stressed. Imagine running a marathon while eating a succulent Chinese meal and giving birth. The last thing bacteria need right now is more stress. So your immune system tries to stress them out as much as possible by ordering inflammation, which floods the battlefield with fluids, attack proteins and soldiers. Pretty stressful! Fever is even more stress!inflammation n. 炎症For the bacteria a moment ago, the temperature range was pleasant, now the world burns! (Q4) Heat can cause their organs to break and membranes to rupture, damage their DNA and diminish protein production. They are seriously suffering from the heat. Why doesn’t this affect your cells? It does! All of this is stressful for your cells, too. Virtually, every system and organ of your body works worse during fever ― except one: your immune system. (Q5) Neutrophils are recruited faster, macrophages and dendritic cells are better at devouring enemies, Killer cells kill better and so on. And fever animates your immune cells to gobble up the critical resources your enemies need, like iron, glucose and glutamine, turning the battlefield into a food desert.rupture v. 破裂，裂开glucose n. 葡萄糖The viruses that infected millions of cells are doing even worse because they are also very sensitive to heat. For example, the rhinovirus that causes the common cold can only infect your respiratory tract because it is significantly colder than the rest of your body, even without fever.respiratory adj. 呼吸的The heat is also really bad for the millions of cells that are infected by viruses at this point. They are working super hard producing viruses, which is pretty stressful.(Q6) As the heat becomes too much to bear, the super stressed cells panic. As their internal machinery is breaking and failing, they quickly produce billions of heat shock proteins, or HSPs, that start repairs, keeping them alive. But this is a trap. Even your healthy cells produce HSPs to deal with the heat ― but if a cell makes too many of them, this means it is more stressed than it should be. And if it is too stressed, something is wrong, and it should be killed. So your natural killer cells and killer T cells are activated and attracted by HSPs and start killing infected cells and all the viruses inside them. By trying to protect themselves, infected cells are calling out to be destroyed.But if fever is such an effective weapon, why don’t your enemies adapt to it? How is it still viable, in so many different animals, after hundreds of millions of years? A wild reason is that fever actually might outsmart evolution. If your enemies survive fever long enough, natural selection changes them. The individuals that are better suited to deal with heat reproduce more. After a few days, they have adapted. But this becomes a handicap ― (Q7) because the next step is to infect new victims in new bodies, and now healthy humans are too cold for them, not impossible to infect, just harder. And the heat-resistant microbes now compete with their cousins that like it colder and have an advantage infecting healthy hosts. This creates an evolutionary dilemma without a perfect solution.To circumvent this, serious pathogens like measles use hit and run tactics. (Q8) The measles virus replicates ultra-fast and is the most infectious right before your fever hits with full force. It’s brutally beaten back once your full immune response shows up, but by then, the damage is done.pathogen n. 病原体Fever is an effective part of the puzzle of your immune system, helping to attack and stress your enemies from as many angles as possible. But if fever is so great, why do we stop it when we are sick?Should You Fight Fever with Medications?We think it is normal to have magic pills, but relatively harmless, over-the-counter pain medication like Aspirin or Ibuprofen only became cheap and widely available in the last century or so. Going to a pharmacy to get something for your headache is extremely new in human history. Pain feels bad, so we’ve gotten used to stopping it when we feel it. If you are sick, you’re supposed to feel a reasonable amount of pain so you lie down and save energy. This is not a bug but a feature of your immune system. But pain and fever are closely connected and over the counter pain medication like Ibuprofen and Paracetamol also work against fever. Especially in children fever is often suppressed by worried parents or doctors ― sometimes because they think fever itself is the disease or they are worried that it can do long-term harm.ibuprofen n. 布洛芬（一种止痛药和解热药）paracetamol n. 醋氨酚；扑热息痛In general, it’s fair to say that for temperatures below 40°C or 104°F, fever is not dangerous and doesn’t need to be treated. Of course, there are also patients that should not have fever ― like pregnant women, seniors and seriously weakened patients. For them, the extra stress may be dangerous. Fever over 40°C is dangerous to anybody because it’s most likely caused by your internal heat monitor failing. Things get more complicated in serious disease territory. (Q9) We also have evidence that for some diseases like influenza or chickenpox, antifever drugs do not help you to heal faster. But we are also running into ethics problems here that make clinical trials difficult. In one study, doctors gave strong anti-fever treatment to critical care patients ― but had to stop after mortality shot up. ethics n. 伦理，道德规范Overall, we have strong indications that more people may survive serious infectious diseases better with a fever. And there is very little clinical evidence that stopping fever leads to better health outcomes. But there are important exceptions, like neurological injuries and stroke. We definitely need a lot more research.So, should you fight fever? (Q10) Well, speak to your doctor and don’t listen to Internet videos. But this decision is really about payoffs. If a fever is not dangerously high and you can bear it, you are supporting your defenses and may even get healthy a bit faster. But if you feel really bad and are healthy in general, taking a pill against pain and fever will make you feel better quicker, at the cost of a slightly less effective immune defense. However you decide, the next time you are burning up and feeling bad, you can rest easy in the knowledge that your enemies are having a much worse time than you. Part III. KEYQ1.B. 细节题。根据“Humans are warm blooded animals, and our bodies expend a lot of energy to keep us around 37°C or 98.6 °F, which seems wasteful, but this may actually be a defensive adaptation - our temperature makes us almost entirely immune to one of the worst killers and parasites: fungi.”说明人类消耗大量的能量把体温维持在37°C（98.6°F），这看似浪费，但这实际上可能是一种防御性适应, 我们的体温使我们几乎完全免疫于真菌这类致命寄生虫。因此答案为B。Q2.C. 主旨题。根据“Fever is defensive climate change pushing an invader outside its ideal temperature range and making the world horrible.”可知发烧是通过提高体温来抵御入侵者（病菌等），将入侵者推到其理想温度范围之外，并杀害他们。因此答案为C。Q3.D. 细节题。根据“They float away from the battlefield and pass right into your brain, where specialized receptors pick them up and crank up your internal thermostat.”可知热源直达你的大脑，触发体内恒温器，使其升高来引发发热。因此答案为D。Q4.C. 细节题。根据“Heat can cause their organs to break and membranes to rupture, damage their DNA and diminish protein production.”可知高烧会导致细菌的器官破裂和细胞膜破裂，损坏它们的DNA并减少蛋白质产生。因此答案为C。Q5.A. 细节题。根据“Neutrophils are recruited faster, macrophages and dendritic cells are better at devouring enemies, Killer cells kill better and so on.”可知中性粒细胞加速集结，巨噬细胞和树突状细胞在吞噬敌人方面表现得更好，杀伤细胞的杀伤力也更强。因此答案为A。Q6.B. 细节题。根据“As the heat becomes too much to bear, the super stressed cells panic. As their internal machinery is breaking and failing, they quickly produce billions of heat shock proteins, or HSPs, that start repairs, keeping them alive.”可知当热度变得难以承受时，细胞压力过大，它们内部机制崩溃时，它们会快速产生数十亿的热休克蛋白。因此答案为B。Q7.D. 推理题。根据“because the next step is to infect new victims in new bodies, and now healthy humans are too cold for them, not impossible to infect, just harder.”可知下一步是感染新宿主，现在健康的人类对它们来说太冷了，太难感染了。因此答案为D。Q8.A. 细节题。根据“The measles virus replicates ultra-fast and is the most infectious right before your fever hits with full force. It’s brutally beaten back once your full immune response shows up, but by then, the damage is done.” 可知麻疹病在你的发烧完全发作之前是最具传染性的，因此在那之前它会快速复制传播，一旦你的完全免疫反应出现，它将被残酷地击退，但那时，损害已经完成了。因此答案为A。Q9. C. 细节题。根据“We also have evidence that for some diseases like influenza or chickenpox, antifever drugs do not help you to heal faster.” 可知有证据表明，对于一些疾病如流感或水痘，退烧药并不会加快康复。因此答案为C。Q10. C. 推理题。根据“Well, speak to your doctor and don’t listen to Internet videos.”可知发烧是否用药应咨询医生，而不是听信网上的视频。因此答案为C。（本文图片来源于摄图网，版权归摄图网所有)