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, 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.

A growing number of people are practicing what is now called digital detox, the deliberate decision ①to stop using smartphones for a set period. Rather than checking notifications every few minutes, participants unplug for a weekend, a week, or sometimes even longer. Numerous studies suggest that this temporary withdrawal ②produce real benefits for both the mind and the body. First, attention spans ③fragmented by constant notifications gradually recover, allowing people to concentrate on single tasks for longer stretches. Second, avoiding screens before bedtime improves sleep quality, since blue light ④emitted by devices is known to disrupt natural sleep cycles. Third, people freed from their phones often rediscover the pleasure of face-to-face conversations ⑤that had been replaced by texting.

Carbon neutrality refers to a state in which the amount of greenhouse gases a country or company releases into the atmosphere ①is balanced by the amount it removes, resulting in zero net emissions. Achieving this goal typically requires several sequential stages rather than a single sudden action. First, organizations attempt to reduce emissions directly ②by replacing fossil fuels with renewable energy sources such as solar or wind power. Next, they improve efficiency throughout their operations, ③minimizing the energy wasted during production and transportation. Only after these direct measures have been maximized do most organizations turn to offsetting, ④which involve funding projects like reforestation or carbon capture to compensate for emissions that cannot yet be eliminated. Critics argue, however, that some companies exploit offsetting too early, ⑤using it to avoid making genuine reductions. Therefore, experts insist that a credible roadmap must always prioritize actual emission cuts before relying on compensation.

Retailers use a variety of techniques designed to encourage customers to make unplanned purchases. Placing small, inexpensive items near checkout counters, for example, tempts shoppers who are already waiting in line with little else to do. Online stores achieve a similar effect through countdown timers that create a false sense of urgency, suggesting that a deal will vanish within minutes. Bright colors, cheerful music, and pleasant scents are also carefully chosen to put customers in a relaxed mood, making them less likely to think critically about their spending. Critics argue that these tactics ___________. Supporters of the industry insist that such techniques merely make shopping more enjoyable and are not inherently deceptive.

3D printing has found practical applications across a surprisingly wide range of fields. (A) In medicine, for example, hospitals now create prosthetic limbs that are precisely tailored to each patient's body. (B) The automotive industry has also adopted the technology, using it to manufacture lightweight parts that improve fuel efficiency. (C) Even small businesses have gained access to manufacturing capabilities that were once available only to large corporations with significant capital.

주어진 문장: Faced with this uncertainty, many people begin editing their online behavior far more cautiously than before. Social media researchers use the term context collapse to describe what happens when a single online post reaches audiences that would normally remain separate in offline life. ( ① ) In daily interactions, people naturally adjust their tone and content depending on whether they are speaking with family, close friends, or professional colleagues. ( ② ) However, a typical social media feed merges these distinct audiences into one undivided crowd, since a single post can simultaneously reach parents, employers, and casual acquaintances. ( ③ ) Consequently, users often struggle to decide which version of themselves to present, knowing that a joke suitable for close friends might seem unprofessional to a supervisor. ( ④ ) For example, a party photo posted for friends could later damage someone's reputation if an employer notices it. ( ⑤ ) This tension forces many users to either self-censor heavily or maintain multiple separate accounts tailored to different audiences.

This grogginess occurs because the brain has not fully completed a sleep cycle and is abruptly pulled out of its deepest phase. A short nap taken in the early afternoon, often called a power nap, can noticeably sharpen attention and mood without leaving a person groggy afterward. ( ① ) The key lies in timing: naps limited to roughly twenty minutes allow the brain to pass through the lightest stages of sleep while avoiding the deeper stages associated with slow-wave activity. ( ② ) If a nap extends much beyond that window, the sleeper risks waking during deep sleep, which produces a foggy, disoriented feeling known as sleep inertia that can persist for thirty minutes or more. ( ③ ) Laboratory studies comparing napping and non-napping groups have repeatedly shown that a brief nap improves reaction time and short-term memory almost as effectively as a full night of extra rest. ( ④ ) Interestingly, the benefit appears strongest when the nap occurs several hours after waking, since this is when the body's natural dip in alertness makes rest most effective. ( ⑤ ) For this reason, many workplaces now designate quiet rooms where employees can recharge briefly during the day.

In response, some platforms have begun inserting occasional wildcard suggestions that are deliberately unrelated to past viewing habits. After a viewer finishes an episode, a streaming service rarely leaves the choice of what to watch next entirely up to chance. ( ① ) Instead, a recommendation algorithm compares that viewer's habits with patterns drawn from millions of other users who watched similar content, then ranks thousands of titles in order of predicted interest. ( ② ) This approach keeps viewers engaged far longer than a simple list of new releases ever could, which is precisely why streaming companies invest so heavily in refining it. ( ③ ) The system is not without drawbacks, however. Because the algorithm favors titles similar to what a viewer already enjoys, it can quietly narrow someone's exposure to unfamiliar genres, directors, or cultures, creating a comfortable but repetitive bubble. ( ④ ) These wildcard picks are meant to counteract this narrowing effect and keep recommendations from becoming too predictable. ( ⑤ )

Because this feedback loop relies entirely on light rather than on the clock on the wall, melatonin release can shift dramatically when a person travels across time zones or works through the night. Melatonin is a hormone produced by a small gland deep within the brain, and its release follows a remarkably predictable daily pattern. ( ① ) Levels stay low throughout the bright hours of the day, begin rising in the evening as darkness falls, peak in the middle of the night, and then decline again as morning approaches. ( ② ) This rhythm is controlled primarily by light: specialized cells in the eye detect brightness and send signals that either permit or suppress melatonin production, which is why exposure to bright screens late at night can delay its release and make falling asleep more difficult. ( ③ ) Unlike some hormones that directly cause the body to perform a task, melatonin does not force sleep to occur; instead, it signals to the rest of the body that night has arrived, preparing various systems to shift into a lower-energy state. ( ④ ) Because of this signaling role, taking melatonin supplements at the wrong time can shift a person's internal clock in the opposite direction from what was intended. ( ⑤ )

주어진 문장: Yet this strategy of delay backfires, since it leaves no time to revise or correct errors before the deadline. Many students assume that perfectionists work harder than everyone else, but psychologists describe a puzzling pattern called the perfectionism-procrastination cycle. ( ① ) This term describes how an intense fear of imperfect work causes people to delay starting a task rather than begin it. ( ② ) Because perfectionists set impossibly high standards, they often feel anxious before they even begin, and the task feels overwhelming. ( ③ ) They then postpone the work to avoid facing their own unrealistic expectations, even though delay only increases their stress later. ( ④ ) For example, a student writing a research paper might spend hours reorganizing notes instead of composing a single sentence that feels good enough. Likewise, an employee facing an important report may check emails repeatedly rather than begin drafting, fearing an early attempt will seem inadequate. ( ⑤ ) Ironically, this avoidance guarantees the very failure that perfectionists dread, since rushed, last-minute work rarely meets their own high standards.