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 ① shifts later, making it difficult for teenagers to fall asleep before eleven at night. Yet school start times rarely adjust to this shift, 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 ② impaired concentration, weakened memory, and a higher risk of anxiety and depression. It can also disrupt the hormones that regulate appetite, contributing to ③ unhealthy weight gain over time. Some school districts have experimented with delaying start times by even thirty minutes, and early results suggest that students who gain that extra rest show ④ worsened grades, better mood, and fewer tardy arrivals. Despite this evidence, changing entrenched school schedules remains a slow and ⑤ contentious process.

Among the many tools available to those who design choice environments, few are as quietly powerful as the default option, the alternative that takes effect automatically unless a person actively selects something else. Because changing a default requires deliberate effort, many individuals simply accept whatever arrangement has been preselected for them. Designers of public policy and digital platforms alike have consequently come to recognize that setting a thoughtful default can achieve outcomes that ___________ often struggle to accomplish through persuasion or financial incentive alone.

Insomnia is rarely caused by a single factor; it usually emerges from an interaction between psychological stress and physiological arousal that keeps the body from settling into sleep. A common trigger is what researchers call cognitive hyperarousal, in which _______________. At the same time, the body's stress response system can become chronically activated, releasing hormones such as cortisol that keep heart rate and body temperature elevated at night, both of which interfere with the natural drop in arousal needed to fall asleep. Poor sleep habits, including irregular bedtimes and excessive screen use before bed, can further weaken the body's internal signals for sleep onset. Because these psychological and physiological factors reinforce one another, effective treatment for chronic insomnia addresses both the racing mind and the underlying pattern of physical tension, rather than relying on medication alone.

Aerobic exercise, such as jogging, swimming, or cycling at a steady pace, produces a wide range of benefits that extend well beyond simple calorie burning. (A) This adaptation explains why trained athletes often have a much lower resting heart rate than sedentary individuals of the same age. (B) Over weeks of consistent training, the heart gradually enlarges and becomes more efficient, delivering the same amount of oxygen to working muscles while beating fewer times per minute. (C) Most fundamentally, it strengthens the heart itself, forcing it to pump larger volumes of blood with each beat.

During sleep, the brain does not simply rest; it actively reorganizes the day's experiences into lasting memories through a process called consolidation. (A) Sleep researchers have demonstrated this effect experimentally: participants who slept after learning a list of word pairs recalled more items the next day than participants who remained awake instead. Crucially, the benefit was not limited to simple recall; sleep also seemed to help participants extract general patterns from the material, suggesting that consolidation involves more than passive storage. (B) Newly formed memories are initially fragile and stored primarily in a brain region called the hippocampus, which has limited long-term capacity. (C) While a person sleeps, particularly during the deep stages of non-REM sleep, neural activity replays these fresh memory traces in rapid, compressed sequences, gradually transferring the information to the cortex for more durable, long-term storage. This replay strengthens the connections between neurons that encoded the original experience, making the memory more resistant to interference from unrelated events the following day.

Sleep debt refers to the cumulative gap between the amount of sleep a person needs and the amount they actually get. (A) Unlike a financial debt, however, this deficit cannot simply be repaid with a single long weekend of rest. (B) When someone loses two hours of sleep every night for a week, the body does not treat the shortage as fourteen separate small losses; instead, it accumulates the deficit, and the resulting impairment in attention and mood can resemble that of a person who has been awake for an entire night. (C) Researchers have found that even modest, chronic sleep restriction gradually impairs reaction time and decision-making, often without the affected person noticing the decline. This is because subjective feelings of tiredness tend to plateau after a few days, even as objective performance keeps deteriorating. Consequently, people frequently underestimate how much sleep debt they are carrying until a demanding task suddenly exposes the accumulated cost.

The adoption of behavioral insights into government policy has not proceeded without institutional resistance. (A) Career civil servants accustomed to designing programs around traditional levers, such as financial penalties or public information campaigns, have sometimes questioned whether small changes in wording or presentation could meaningfully influence outcomes that seemed to demand more substantial intervention. (B) Skepticism began to diminish, however, as rigorously controlled trials demonstrated measurable improvements in outcomes ranging from tax compliance to vaccination rates, providing evidence that traditional advocates could not easily dismiss. (C) As a result, many governments now require that new behavioral interventions be tested through randomized trials before wider implementation, a practice that has simultaneously built credibility for the approach and generated a growing body of reliable evidence.

Storing summer fruit properly can help you avoid waste and enjoy fresher flavors. (A) Berries, however, should not be washed until just before eating, because moisture encourages mold to grow. (B) Watermelon and melon should be kept in the refrigerator once they are cut, since warm air speeds up spoiling. (C) Bananas, unlike most fruit, are best kept on the counter rather than in the refrigerator.

Ordinary evidence cannot help here, since any proof gathered through the senses would itself be generated by the same simulation being tested. Suppose a mad scientist removed a living brain from its body, placed it in a vat of nutrient fluid, and connected its neurons to a supercomputer capable of generating perfectly realistic sensations. ( ① ) The brain would experience a full and convincing world, complete with a sky, a body, and other people, without ever suspecting that none of it existed outside the simulation. ( ② ) This scenario, unsettling as it sounds, raises a genuinely difficult question for anyone confident in their own perception: how could a person ever prove that they are not that very brain right now? ( ③ ) Some philosophers conclude that absolute certainty about the external world is simply unattainable. ( ④ ) Others argue, however, that the mere possibility of deception, however vivid, is not sufficient reason to abandon our everyday trust in what we perceive. ( ⑤ ) Ordinary caution, after all, can never fully settle which side is correct.

주어진 문장: This ability to anticipate desires so precisely raises an uncomfortable question about how much companies truly know about us. Modern advertising increasingly relies on personal data collected from users' browsing habits, search histories, and social media activity. ( ① ) Companies argue that this approach benefits consumers by showing advertisements that are more relevant to their actual interests rather than random, generic promotions. ( ② ) However, many critics contend that this level of tracking raises serious concerns about privacy, since users rarely understand how extensively their behavior is being monitored. ( ③ ) Some algorithms can predict purchasing decisions before consumers themselves are consciously aware of them. ( ④ ) Furthermore, personalized advertising can trap users in a narrow bubble, repeatedly showing them similar products and limiting their exposure to alternatives. ( ⑤ ) Given these competing concerns, policymakers must strike a careful balance between allowing innovation and protecting individual privacy rights.