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.

A documentary director named Mira first traveled to a remote Arctic glacier to film its towering cliffs of blue ice, ①<u>which seemed frozen in time</u>. ②<u>Standing before the massive wall</u>, she assumed such an enormous structure could hardly ③<u>changed</u> within a lifetime. Five years later, however, she returned to the very same coordinates, ④<u>expecting her camera to capture</u> an identical scene. Instead, she discovered that the glacier had retreated so dramatically that the ice cliffs, once visible from her original position, had nearly disappeared, leaving bare rock and pools of meltwater behind. ⑤<u>Comparing the two sets of footage side by side</u>, Mira realized that a transformation she had expected to take centuries was actually happening within a single decade. This encounter convinced her that climate change, which she had previously regarded as a distant statistic, was in fact an urgent process reshaping landscapes before her eyes.

During sleep, the brain does not simply rest; it actively reorganizes the day's experiences into lasting memories through a process called consolidation. Newly formed memories are initially ① fragile and stored primarily in a brain region called the hippocampus, which has ② unlimited long-term capacity. 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 ③ durable, long-term storage. This replay strengthens the connections between neurons that encoded the original experience, making the memory more ④ resistant to interference from unrelated events the following day. 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 ⑤ extract general patterns from the material, suggesting that consolidation involves more than passive storage.

Across many countries, high schools begin classes 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 later, 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 accumulates into a chronic sleep debt that affects concentration and mood throughout the school day. Researchers who study this mismatch argue that _______________. Some school districts that delayed their start times by thirty minutes reported improvements in attendance, suggesting that the timing of the school day matters more than commonly assumed.

Researchers who study teenagers have found a strong link between how well students sleep and how well they perform in school. (A) 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. (B) 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, converting fragile short-term memories into more durable long-term ones. (C) 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.

Smartphones, tablets, and computer screens all emit a significant amount of blue light, a short-wavelength light that our eyes are especially sensitive to. (A) At night, however, the same wavelength can interfere with the body's natural preparation for sleep by suppressing the release of melatonin. (B) During the day, exposure to blue light from the sun helps keep us alert and mentally sharp, which is generally beneficial. (C) For this reason, some devices now offer a night mode that shifts the display toward warmer tones, though sleep researchers still recommend limiting screen use before bedtime.

The rise of big data has introduced ethical dilemmas that earlier generations of workers never had to consider. (A) Some believe that strict government regulations are necessary, even if such rules slow down innovation and raise costs for businesses. (B) Others argue that companies can regulate themselves effectively through clear ethical training, without needing heavy-handed government intervention. (C) A single careless decision, after all, can expose the private information of millions of people almost instantly.

Many students struggle not with lack of effort but with lack of structure when studying for exams. (A) Once colors are assigned, the student blocks specific hours of the day for each subject, following the same order as a printed timetable. (B) As a result, switching between subjects no longer feels confusing, because each color block signals exactly what should happen next. (C) One student solved this problem by giving each subject a distinct color on a printed weekly calendar before the semester began.

주어진 문장: Slowly, though, she began to question whether all of these possessions truly made her life better. Jina used to fill her apartment with items she rarely used, believing that owning more things would make her happier. ( ① ) After moving twice within a single year, she grew exhausted from packing boxes filled with clothes she had never worn and gadgets she had forgotten she owned. ( ② ) Frustrated, she decided to try a minimalist lifestyle, keeping only objects that served a clear purpose or brought her genuine joy. ( ③ ) At first, friends questioned why she was giving away perfectly good furniture and clothing. ( ④ ) Gradually, however, she noticed that her small apartment felt calmer and easier to manage. ( ⑤ ) She also realized that she spent significantly less money once she stopped buying things impulsively to fill emotional gaps.

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.