영어 모의고사 (자동 편성)

When the body fights off an infection, the immune system relies heavily on ①adequate sleep to function effectively. During deep sleep, the body produces and releases cytokines, proteins ②that help regulate immune responses and coordinate the fight against harmful invaders. People who consistently sleep fewer than six hours a night ③shows measurably weaker antibody responses after vaccination compared with those who sleep seven or eight hours. Chronic sleep deprivation also appears ④to promote low-grade inflammation throughout the body, a state that has been linked to a higher risk of heart disease. Rather than being a passive state, sleep functions as an active period during which the immune system ⑤repairs itself and prepares for future threats.

Rather than displaying products in the usual manner, the team designed the space to resemble a colorful garden, inviting visitors to explore and take photographs. Lines formed outside the store within days, even though the products themselves were already available online. Curious about this success, a marketing researcher later interviewed several visitors, who explained that the temporary nature of the event made the experience feel special and worth attending in person. When the two weeks ended, the brand reported a significant ①decrease in both sales and social media followers. ②Encouraged by these results, the company ③began planning ④additional pop-up events in ⑤other cities.

Researchers who study teenagers have found a ①strong link between how well students sleep and how well they perform in school. Students who sleep fewer than seven hours a night tend to score ②lower 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. 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 ③durable long-term ones. 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 ④unfamiliar the next morning. For this reason, some schools have begun ⑤confirming early start times, reasoning that an extra hour of sleep might do more for test scores than an extra hour of studying ever could.

Sleep apnea is a disorder in which breathing repeatedly stops and restarts during sleep, often because the muscles at the back of the throat ①relax too much and block the airway. Each pause can last from a few seconds to over a minute, and it may occur dozens of times in a single night without the sleeper ever ②waking up fully. Because these interruptions rarely produce a clear memory the next morning, many people remain ③unaware that anything is wrong, even as chronic fatigue, headaches, and irritability build up over months. Doctors therefore rely less on a patient's own account of the night and more on ④subjective measurements, such as overnight oxygen levels and airflow patterns recorded in a sleep laboratory. Left untreated, the disorder has been linked to serious long-term risks, including high blood pressure and heart disease, which makes an accurate diagnosis far more ⑤urgent than its subtle nighttime symptoms might suggest.

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. In daily interactions, people naturally adjust their tone and content depending on whether they are speaking with family, close friends, or professional colleagues. 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. 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. For example, a party photo posted for friends could later damage someone's reputation if an employer notices it. This tension forces many users to either self-censor heavily or maintain multiple separate accounts tailored to different audiences. Understanding context collapse _______________.

As technology continues to reshape nearly every profession, the idea of finishing education after graduation has become outdated. Workers who once expected their initial training to last an entire career now find that skills can become obsolete within just a few years. Lifelong learning, therefore, ___________. Many professionals now take short online courses, attend workshops, or earn new certifications while continuing to work full-time.

Recovering from a serious sports injury involves far more than simply waiting for torn tissue to heal; it requires a carefully structured program that gradually reintroduces stress to the affected area. (A) Progressing too quickly at this stage is a common mistake, since tissue that appears healed on the surface may still be structurally fragile beneath it. (B) Skipping the final stage of sport-specific drills, even when an athlete feels fully recovered, dramatically increases the risk of re-injury, because general strength does not automatically translate into the coordination a sport demands. (C) Immediately after an injury, rest and gentle range-of-motion exercises give way to light resistance training as pain subsides, slowly rebuilding strength in muscles weakened by disuse.

Even a modest level of dehydration, as little as two percent of body weight lost through sweat, can measurably reduce an athlete's endurance and cognitive sharpness during competition. (A) 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. (B) As fluid levels drop, blood volume decreases, forcing the heart to work harder to deliver the same amount of oxygen to working muscles, which accelerates fatigue. (C) Athletes competing in hot, humid conditions therefore face a particularly difficult balance, since sweating heavily to stay cool simultaneously depletes the very fluids needed to sustain performance.

Companies have discovered that ordinary advertisements no longer capture the attention of young consumers as effectively as they once did. (A) As a result, many brands now spend a large portion of their advertising budgets on influencer partnerships rather than television commercials. (B) This is because influencers build long-term relationships with their audiences, which makes recommendations feel personal rather than commercial. (C) However, brands must choose their partners carefully, since an influencer's reputation can directly affect how a product is perceived.

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.