영어 모의고사 (자동 편성)

Highlighting an awkward sentence and instantly seeing three smoother alternatives has become a routine part of writing for many students, thanks to AI writing assistants ① built into word processors and browsers. These tools check grammar and spelling, of course, but the more advanced versions go further, ② suggesting clearer phrasing, flagging repetitive words, and even adjusting tone to sound more formal or more casual depending on the purpose. Teachers generally welcome the grammar and spelling support, since it ③ frees up class time to focus on argument and structure rather than comma placement. Concerns grow, however, around the tone and phrasing suggestions, which can gradually ④ nudge every student's writing toward a similar, polished style. Some schools have begun asking students ⑤ submit an early draft alongside the final version, specifically to preserve evidence of a student's own original voice.

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 ① undermine skills that feel automatic in practice. Sports psychologists explain that intense anxiety narrows attention and disrupts the smooth, unconscious execution of well-learned movements, a phenomenon sometimes ② called choking under pressure. Rather than trying to eliminate nervousness entirely, which research suggests ③ are nearly impossible, many trainers now teach athletes ④ to reinterpret the physical symptoms of anxiety, such as a racing heart, as signs of readiness rather than danger. Over time, repeated exposure to high-pressure situations in practice, deliberately ⑤ simulated to resemble real competition, allows athletes to build tolerance the same way their muscles adapt to physical training.

Recovering from a serious sports injury involves far more than simply waiting for torn tissue to heal; it requires a carefully structured program that ① gradually reintroduces stress to the affected area. Immediately after an injury, rest and gentle range-of-motion exercises help prevent stiffness without ② disturbing the healing tissue. As pain subsides, therapists introduce light resistance training, slowly ③ weakening strength in muscles that have weakened from disuse. Progressing too quickly at this stage is a common mistake, since tissue that appears healed on the surface may still be ④ structurally fragile beneath it. Skipping the final stage, even when an athlete feels fully recovered, dramatically ⑤ increases the risk of re-injury.

After an especially demanding training session, the instinct to collapse onto a couch and remain motionless is understandable, yet exercise physiologists increasingly recommend the opposite approach. Active recovery involves performing low-intensity movement, such as a light jog, an easy swim, or a gentle bike ride, on days following intense exertion rather than resting completely, since _______________. Some athletes worry that any movement at all will interfere with the repair process, but research suggests that truly light activity does not meaningfully slow healing and may even reduce the perceived soreness that follows a hard session.

The immune system produces an almost limitless variety of antibodies, each shaped to latch onto one particular molecular target with remarkable specificity. (A) Monoclonal antibody drugs harness this natural precision by cloning a single antibody-producing cell in the laboratory, generating an army of identical antibodies built to recognize one target, such as a protein on a cancer cell or a molecule driving an autoimmune disease. (B) Because the antibody binds only to its intended target, these drugs tend to spare healthy tissue far more effectively than traditional chemotherapy, which attacks any rapidly dividing cell regardless of whether it is cancerous. (C) Manufacturing monoclonal antibodies remains far more complicated than producing a conventional small-molecule pill, and this complexity keeps monoclonal antibody treatments considerably more expensive than most conventional drugs, a cost that continues to shape debates over pricing and access.

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.

When people face a difficult decision, they often weigh not only the expected outcome of each option but also how painful it would feel to discover later that a different choice had been better. (A) Researchers have found that people feel sharper regret over losses that resulted from taking action than over identical losses that resulted from doing nothing. (B) Investors, for example, sometimes continue holding a declining stock rather than selling it, because selling would force them to confront the possibility of having made a clear mistake. (C) This helps explain why so many individuals default to inaction whenever a decision feels uncertain, even when remaining passive is not actually the safer choice.

Every spring, our school holds an art exhibition in the main hallway, and this year I finally submitted a painting of my own. (A) On the morning the paintings went up, I walked past dozens of styles, from careful realistic portraits to messy, colorful abstractions, and none of them looked like mine. Instead of feeling embarrassed, I found myself curious about why each artist had made certain choices. (B) Standing in that crowded hallway, I finally understood that the exhibition's real purpose was not to rank the paintings, but to let students discover how many different perspectives could exist in a single shared space. (C) For weeks, I compared my work to my classmates' drawings and felt sure that mine was not good enough to hang beside theirs. My art teacher noticed my hesitation and said something I did not expect: an exhibition is not a contest to find the single best picture, but a chance to show how differently people see the same world.

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