영어 모의고사 (자동 편성)

Modern sports wearables, from wrist-worn fitness trackers to smart insoles ①embedding in running shoes, continuously collect data that would once have required a laboratory to measure. Heart rate, sleep quality, running cadence, and even subtle changes in gait can now ②be monitored during ordinary daily activity rather than only in a controlled clinical setting. Coaches use this constant stream of information to ③detect early warning signs of overtraining, sometimes noticing a decline in performance before the athlete consciously feels tired. However, the flood of data has created a new challenge: distinguishing a meaningful pattern from ordinary daily fluctuation ④requires expertise that many amateur athletes simply do not have. For this reason, most experts recommend ⑤treating wearable data as a general trend to observe over time, not as a precise diagnostic tool.

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, ①making it difficult for teenagers to fall asleep before eleven at night. Yet school start times rarely adjust to this shift, ②forcing 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 ③that regulating appetite, contributing to unhealthy weight gain over time. Some school districts have experimented with ④delaying 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 ⑤remains a slow and contentious process.

Exercise does far more than strengthen muscles and the heart; it also produces ①measurable changes within the brain itself. During sustained physical activity, the body releases a protein called brain-derived neurotrophic factor, which supports the growth of new neurons and ②strengthens connections between existing ones, particularly in regions associated with memory and learning. Studies comparing physically active students to sedentary peers have repeatedly found that the active group performs ③better on tests of attention and problem-solving, even when the exercise session ends well before the test begins. Researchers believe that exercise increases blood flow to the brain, delivering oxygen and nutrients more efficiently, while also ④raising levels of stress hormones that can interfere with clear thinking. Interestingly, aerobic activities such as running or swimming appear to produce more ⑤pronounced cognitive benefits than purely strength-based training.

Elite athletes often perform in front of enormous crowds with championships, contracts, and years of training riding on a single moment, and the psychological weight of that pressure can ①undermine skills that feel automatic in practice. Sports psychologists explain that intense anxiety ②narrows attention and disrupts the smooth, unconscious execution of well-learned movements, a phenomenon sometimes called choking under pressure. Rather than trying to eliminate nervousness entirely, which research suggests is nearly impossible, many trainers now teach athletes to ③reinterpret the physical symptoms of anxiety, such as a racing heart, as signs of readiness rather than danger. Structured breathing exercises and pre-performance routines also help athletes ④lose a sense of control before a decisive moment. Over time, repeated exposure to high-pressure situations in practice allows athletes to build tolerance, so that pressure gradually feels ⑤familiar rather than overwhelming.

Even a modest level of dehydration, as little as two percent of body weight lost through sweat, can measurably ①increase an athlete's endurance and cognitive sharpness during competition. As fluid levels drop, blood volume decreases, forcing the heart to work harder to deliver the same amount of oxygen to working muscles, which ②accelerates fatigue. Dehydration also impairs the body's ability to regulate its own temperature, since sweating is the primary mechanism for releasing excess heat during intense exercise. Athletes competing in hot, humid conditions face a particularly ③difficult balance, because sweating heavily to stay cool simultaneously depletes the very fluids needed to sustain performance. Simply drinking large amounts of plain water is not always sufficient, however, since heavy sweating also flushes out sodium and other electrolytes ④essential for proper muscle function. For this reason, sports scientists generally recommend a hydration strategy that replaces both fluid and electrolytes, ⑤tailored to an individual athlete's sweat rate and the specific conditions of the event.

Advertisements often rely on subtle psychological techniques that persuade viewers without their conscious awareness. One common method, known as social proof, shows images of many people using or enjoying a product, suggesting that its popularity guarantees quality. Another technique appeals to authority, featuring experts or professionals endorsing a product to make it seem more credible and trustworthy. Emotional appeals are equally common, connecting products with feelings such as happiness, nostalgia, or belonging rather than focusing on practical features. Repetition also plays a significant role, since seeing the same advertisement multiple times increases familiarity, which people often mistake for reliability. Researchers studying consumer behavior have found that ___________, since awareness disrupts the automatic psychological response advertisers depend on.

Ethical consumption has placed new pressure on companies to justify their practices publicly. (A) Yet critics point out that such reports are sometimes little more than carefully worded public relations documents. (B) In response, many corporations now publish detailed reports describing their environmental and labor practices. (C) For this reason, many experts insist that independent audits are necessary to confirm whether ethical claims are genuine.

Greenwashing has become a common strategy among companies eager to appear environmentally responsible. (A) For example, a company might use a green logo or the word "eco" without changing its actual production methods at all. (B) In contrast, genuine sustainability requires real changes, such as reducing waste or using renewable energy sources. (C) Often, this involves marketing language that suggests care for the planet while offering little real evidence.

Every brand has a history, but not every brand knows how to tell it well. (A) For example, a small shoe company once shared the story of its founder's grandfather, who had repaired shoes for workers in need. (B) Consequently, other companies began investing in storytelling as a core part of their marketing strategy. (C) Stories like this create emotional connections that plain advertisements rarely achieve on their own.

None of these explanations, in other words, has to be the whole story. For centuries, dreams have fascinated scientists and philosophers alike, yet no single theory fully explains why the sleeping brain generates such vivid and often bizarre experiences. ( ① ) One prominent idea suggests that dreaming helps the brain process emotional experiences, replaying difficult events in a safe, low-stakes environment so that their emotional intensity gradually fades. ( ② ) Another theory proposes that dreams serve a more practical function, allowing the brain to rehearse responses to threats without any real danger, a kind of nightly simulation that may have offered early humans a survival advantage. ( ③ ) Still other researchers argue that dreaming is simply a byproduct of the brain organizing memories, with vivid imagery arising as the mind sorts through the day's information rather than serving any independent purpose of its own. ( ④ ) Because these theories rest on indirect evidence rather than direct observation of subjective experience, none has been conclusively proven. ( ⑤ ) Many scientists now suspect that dreaming may serve several of these functions simultaneously rather than just one.