영어 모의고사 (자동 편성)

Across the world, teenagers are chronically short on sleep, often getting two or three hours less than the eight to ten hours experts recommend for their age. Part of the problem lies in biology: as puberty begins, the body's internal clock naturally shifts later, ① making it difficult for teenagers to fall asleep before eleven at night. Yet school start times rarely adjust to this shift, ② forcing students to wake before their bodies are ready. The consequences extend well beyond simple tiredness. Chronic sleep loss during adolescence has been linked to impaired concentration, weakened memory, and a higher risk of anxiety and depression. It can also disrupt the hormones ③ that regulating appetite, contributing to unhealthy weight gain over time. Some school districts have experimented with ④ delaying start times by even thirty minutes, and early results suggest that students who gain that extra rest show improved grades, better mood, and fewer tardy arrivals. Despite this evidence, changing entrenched school schedules ⑤ remains a slow and contentious process.

Many people struggling to fall asleep in noisy environments turn to white noise machines, devices that emit a ① chaotic, uniform sound covering a broad range of frequencies. The appeal lies in a phenomenon called auditory masking, in which a constant background sound makes sudden noises, such as a slamming door, ② less noticeable to the sleeping brain. Without this masking effect, an abrupt change in sound is far more likely to trigger a brief awakening, even if the sleeper does not ③ consciously remember it the next morning. Studies comparing sleep in quiet rooms with sleep alongside white noise have found that participants using white noise experienced fewer of these brief awakenings and reported feeling more ④ rested. However, researchers caution that the benefit depends heavily on volume and consistency, since noise that is too loud or that varies unpredictably can itself become a source of ⑤ disruption rather than a remedy.

Across many countries, high schools begin classes ① early in the morning, often before eight o'clock. This schedule assumes that teenagers can simply go to bed earlier to compensate, but biology tells a different story. During adolescence, the body's internal clock shifts ② earlier, delaying the release of melatonin until well after ten at night. As a result, most teenagers are not physiologically ready to fall asleep until much later than younger children or adults. When early start times force them to wake before their bodies have completed a full sleep cycle, the mismatch ③ accumulates into a chronic sleep debt that affects concentration and mood throughout the school day. Researchers who study this mismatch argue that the underlying problem is not laziness or poor discipline among students, but a scheduling system built around adult rhythms rather than ④ adolescent ones. Some school districts that delayed their start times by thirty minutes reported ⑤ measurable improvements in attendance.

Sleep hygiene refers to a set of simple daily habits that help the body prepare for consistent, restorative rest. Experts commonly recommend going to bed and waking up at the same time every day, even on weekends, because an irregular schedule confuses the body's internal clock and makes it harder to fall asleep on demand. They also advise reserving the bedroom for sleep alone, since using the bed to study, scroll through a phone, or watch videos teaches the brain to associate that space with wakeful activity rather than rest. Physical environment matters as well: a cool, dark, and quiet room tends to produce deeper sleep than one that is warm, bright, or noisy. None of these individual habits guarantees a good night's sleep on its own, but together they form a routine that _______________, much the way a consistent set of cues trains an athlete's body to perform at a certain time each day.

Researchers who study teenagers have found a strong link between how well students sleep and how well they perform in school. Students who sleep fewer than seven hours a night tend to score lower on tests of memory and attention than those who sleep eight or nine hours, even when the two groups study for the same number of hours. One explanation is that sleep plays an active role in learning: during certain stages of sleep, the brain replays and strengthens information encountered during the day, _______________. When sleep is cut short, this consolidation process is interrupted before it can finish, so material that seemed well understood the night before often feels unfamiliar the next morning. For this reason, some schools have begun rethinking early start times, reasoning that an extra hour of sleep might do more for test scores than an extra hour of studying ever could.

When an image-generating program produced a strikingly detailed painting in the exact style of a well-known illustrator within seconds, my art club spent an entire meeting arguing about what it actually meant for artists. (A) Others worried that the program had been trained on thousands of real illustrations scraped from the internet without the original artists' permission, meaning the tool's impressive results were quietly built on other people's uncredited labor. (B) Some members felt excited, imagining the software as a helpful tool that could speed up brainstorming or generate quick backgrounds for their comics. (C) A few pointed out that the final image, however skillful it looked, reflected no personal memory, struggle, or intention, only patterns learned from existing pictures, and the debate never reached a clear conclusion.

Skipping a proper warm-up before intense exercise might seem like a harmless way to save a few minutes, but the practice carries real physiological costs. (A) Gradually raising body temperature through light activity, however, increases blood flow to the muscles and helps nerve signals travel faster between the brain and the muscle fibers. (B) A cold muscle, after all, is stiffer and less elastic than a warm one, making it considerably more prone to strains and tears when suddenly asked to contract forcefully. (C) For this reason, coaches treat warm-up routines not as optional preparation but as an essential part of training itself.

주어진 문장: He paused for a moment, feeling unsure about what the right choice really was. One Saturday morning, Jiho carried a heavy bag of old clothes to the donation box near his apartment. He had grown taller over the winter, so many shirts no longer fit him. ① At first, he almost threw the clothes into the regular trash without thinking twice. ② However, his older sister reminded him that clean clothes could still help someone else. She explained that donating clothes was like giving a plant a second chance to grow. ③ For example, a jacket he had outgrown might keep another child warm this winter. ④ Therefore, Jiho folded each shirt neatly and placed them gently inside the box. In contrast to his first careless idea, he now felt genuinely happy about his choice. ⑤ Walking home, Jiho realized that small actions could create meaningful change for others.

주어진 문장: Such consistency across repeated trials suggests that the pattern is a genuine feature of human cognition, not random noise. In a classic experiment inspired by Keynes's beauty contest analogy, participants choose a number between zero and one hundred, and the winner is whoever selects the number closest to two-thirds of the average of all guesses submitted. ( ① ) A perfectly rational player, assuming every other participant reasons with unlimited depth, would conclude the equilibrium number is zero, since reasoning about others' reasoning collapses the average toward that single point. ( ② ) In practice, however, actual guesses rarely converge on zero; most participants stop reasoning after a round or two of imagining what others might guess, producing average guesses that cluster between twenty and thirty-five. ( ③ ) This gap between theoretical equilibrium and observed behavior reveals that human reasoning is bounded, capable of anticipating a few steps ahead but rarely capable of iterating the process indefinitely. ( ④ ) Economists use this game as a diagnostic tool, since the number a person submits reveals how many levels of strategic thinking that person is willing to perform. ( ⑤ ) This is a measure that idealized rational agents could never provide.

This puzzling inconsistency is not, as it turns out, a matter of chance. Two patients diagnosed with the same disease and prescribed the same medication can respond in strikingly different ways, one recovering quickly while the other experiences little benefit or even harmful side effects. ( ① ) Precision medicine starts from the observation that this variation often traces back to differences buried in each patient's genome. ( ② ) These differences determine how efficiently a body absorbs, breaks down, or responds to a given drug. ( ③ ) By sequencing a patient's DNA before treatment begins, doctors can increasingly predict which medication is likely to work best and at what dose, replacing a strategy once described as one-size-fits-all with something closer to a tailored fit. ( ④ ) This approach has proven especially valuable in cancer treatment, where tumors from two patients with the same diagnosis may carry entirely different genetic mutations that respond to entirely different drugs. ( ⑤ ) Widespread adoption still faces real obstacles, since genetic sequencing remains expensive in many regions and few doctors have been trained to interpret the flood of genetic data such tests now produce.