영어 모의고사 (자동 편성)

After a strenuous workout, muscle fibers experience thousands of microscopic tears, and the body immediately begins a repair process ① that ultimately makes the muscle stronger than it was before. This repair depends heavily on amino acids, the building blocks that protein ② supplying, which is why sports scientists recommend consuming protein within a couple of hours after training. Waiting too long to eat can slow recovery, since a muscle's sensitivity to amino acids gradually ③ declines once that window closes. Many athletes assume that eating an enormous quantity of protein in a single sitting will speed up this process, but the body can only use a limited amount at once; the rest is simply ④ burned for energy or stored as fat. For this reason, nutritionists generally advise ⑤ spreading moderate portions of protein evenly across several meals throughout the day rather than saving it all for one large post-workout meal.

When the body fights off an infection, the immune system relies heavily on ① adequate sleep to function effectively. During deep sleep, the body produces and releases cytokines, proteins ② that help regulate immune responses and coordinate the fight against harmful invaders. People who consistently sleep fewer than six hours a night ③ shows measurably weaker antibody responses after vaccination compared with those who sleep seven or eight hours. Chronic sleep deprivation also appears ④ to 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 ⑤ repairs itself and prepares for future threats.

Time-management researchers frequently mention a principle known as Parkinson's Law, which states that work ①expands to fill the time available for its completion. According to this idea, a task that could be finished in one hour will often stretch to fill an entire afternoon if that much time is scheduled for it. Students who set ②vague deadlines frequently experience this effect, spending extra hours refining a report that was already ③complete. Employees given a full week for a simple project may also delay meaningful progress until the final days, even though the actual work requires far ④more effort. This pattern happens partly because people unconsciously adjust their pace to match perceived urgency. Setting shorter, more specific deadlines can ⑤counter this tendency, forcing tasks to fit within a tighter and more realistic window.

Caffeine is the most widely consumed stimulant in the world, prized for its ability to ① sharpen focus and fight off fatigue within minutes of consumption. It works by blocking adenosine, a chemical that gradually builds up in the brain throughout the day and makes us feel ② decreasingly sleepy the longer we stay awake. By occupying the receptors that adenosine would normally bind to, caffeine tricks the brain into feeling alert even when the body has accumulated significant sleep pressure. The effects, however, last far longer than most people realize. Because caffeine can remain active in the bloodstream for five to six hours, a cup of coffee consumed in the late afternoon may still be ③ interfering with the ability to fall asleep at midnight. Even when people do not consciously notice difficulty falling asleep, caffeine has been shown to ④ reduce the amount of deep, restorative sleep obtained later in the night. For this reason, many sleep specialists advise ⑤ avoiding caffeine after early afternoon.

Aerobic exercise, such as jogging, swimming, or cycling at a steady pace, strengthens the heart by forcing it to pump ① larger volumes of blood with each beat. Over weeks of consistent training, the heart gradually enlarges and becomes more efficient, meaning it can deliver the same amount of oxygen to working muscles while beating ② fewer times per minute. This adaptation explains why trained athletes often have a much ③ lower resting heart rate than sedentary individuals of the same age. Beyond the heart itself, aerobic activity encourages the body to build new capillaries within muscle tissue, ④ worsening the delivery of oxygen and nutrients at a cellular level. Researchers have also found that regular aerobic exercise ⑤ reduces inflammation throughout the body and improves the way cells respond to insulin.

Psychologists have long studied a mechanism called the variable reward schedule, in which rewards arrive ①predictably rather than after every single action. Slot machines famously exploit this principle, and social media notifications operate on strikingly similar logic. When someone posts a photo, they cannot predict exactly when likes will appear, nor how many they will eventually receive. This uncertainty triggers a small burst of dopamine each time the phone is checked, regardless of whether the result is ②disappointing or thrilling. Consequently, users often refresh their feeds ③compulsively, hoping the next check will finally bring a satisfying reward. What makes this troubling is that technology companies ④deliberately designed notification systems using insights borrowed from gambling research, rather than stumbling upon them by accident. Such practices raise serious ethical questions about ⑤manipulating users' brains for profit.

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. Immediately after an injury, rest and gentle range-of-motion exercises help prevent stiffness. As pain subsides, therapists introduce light resistance training, slowly rebuilding strength in muscles that have weakened from disuse. Progressing too quickly at this stage is a common mistake, since _______________. Only after strength and flexibility approach pre-injury levels do specialists introduce sport-specific drills that mimic the exact movements an athlete will face in competition.

For centuries, dreams have fascinated scientists and philosophers alike, yet no single theory fully explains why the sleeping brain generates such vivid and often bizarre experiences. One prominent idea suggests that dreaming helps the brain process emotional experiences, _______________. Another theory proposes that dreams serve a more practical function, allowing the brain to rehearse responses to threats without any real danger, a kind of nightly simulation that may have offered early humans a survival advantage. Still other researchers argue that dreaming is simply a byproduct of the brain organizing memories, with vivid imagery arising as the mind sorts through the day's information rather than serving any independent purpose of its own.

Only a decade ago, translation apps produced sentences so awkward that users often laughed at the results rather than trusting them. (A) Frequent travelers now point their phone cameras at street signs and receive an instant translation overlaid on the screen, thanks to this leap in accuracy. (B) Even so, the technology still struggles with humor, sarcasm, and cultural nuance, areas where a single wrong word can completely change the intended meaning. (C) Today, many of these apps rely on neural networks that analyze entire sentences at once, capturing context instead of translating word by word.

In other words, what looks like a lack of discipline may actually be a biological mismatch. Across many countries, high schools begin classes early in the morning, often before eight o'clock. ( ① ) This schedule assumes that teenagers can simply go to bed earlier to compensate, but biology tells a different story. ( ② ) During adolescence, the body's internal clock shifts later, delaying the release of melatonin until well after ten at night. ( ③ ) As a result, most teenagers are not physiologically ready to fall asleep until much later than younger children or adults are, and 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. ( ④ ) Researchers who study this mismatch argue that the underlying problem is not laziness or poor discipline among students, but a scheduling system built around adult rhythms rather than adolescent ones. ( ⑤ ) Some school districts that delayed their start times by thirty minutes reported improvements in attendance.