영어 모의고사 (자동 편성)

A short nap taken in the early afternoon, often called a power nap, can noticeably sharpen attention and mood without ① leaving a person groggy afterward. The key lies in timing: naps limited to roughly twenty minutes allow the brain ② to pass through the lightest stages of sleep while avoiding the deeper stages associated with slow-wave activity. If a nap extends much beyond that window, the sleeper risks ③ waking during deep sleep, which produces a foggy, disoriented feeling known as sleep inertia that can persist for thirty minutes or more. Laboratory studies ④ 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. 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 ⑤ effectively.

Athletes preparing for major endurance events sometimes ① trains for weeks at high altitude, where the air contains less oxygen than at sea level, in hopes of gaining a physiological edge once they return to compete at lower elevations. In this thin air, the body responds by producing more red blood cells, ② which carry oxygen more efficiently through the bloodstream to working muscles. When these athletes return to sea level, where oxygen is more abundant, their blood ③ retains this elevated capacity for a limited period, potentially translating into improved endurance performance. However, the benefits of altitude training are far from guaranteed, since individual athletes respond quite differently to the same conditions, and some experience excessive fatigue that ④ undermines the very training they hoped to complete. Many elite programs therefore follow a strategy known as live high, train low, in which athletes sleep at altitude to stimulate blood adaptations but perform intense workouts at lower elevation ⑤ to maintain quality and intensity.

Many people believe that building a new habit requires strong willpower or motivation. However, psychologist BJ Fogg argues that habits form more ①easily when a behavior itself becomes simple to perform. His theory, called the Fogg Behavior Model, states that a behavior happens only when motivation, ability, and a prompt occur together. When motivation is ②low, the model suggests, the task must be made extremely ③difficult, or it will not happen at all. For instance, a person who wants to exercise daily succeeds more often by committing to one push-up than to a long workout. Fogg calls this idea the law of ④least effort, since people naturally choose the option requiring the least energy. A student who wants to read more might leave a book open on the desk rather than setting a vague goal. By lowering the required effort, people reduce the ability barrier and make steady action far more ⑤achievable.

Have you ever felt a ①boring class lasted forever while an exciting weekend disappeared in an instant? This common experience reflects what psychologists call the distortion of time perception: subjective time can differ from actual clock time. Researchers explain that people who focus intensely on an enjoyable activity process fewer separate moments, so time seems to pass ②slowly. In contrast, bored or anxious people pay ③closer attention to each moment, making time feel as though it is dragging. When people become deeply ④engaged in a task, they often lose track of time, unaware of how many minutes have passed. For example, athletes and musicians often say that hours felt like minutes while they were fully ⑤absorbed in performance.

Melatonin is a hormone produced by a small gland deep within the brain, and its release follows a remarkably predictable daily pattern. 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. 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. Unlike some hormones that directly cause the body to perform a task, _______________, preparing various systems to shift into a lower-energy state. 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.

An echo chamber refers to an online environment where people are mainly exposed to opinions that already match their own beliefs. This phenomenon occurs because social media algorithms tend to recommend content similar to what users have previously liked or shared, gradually narrowing the range of perspectives they encounter. As a result, individuals inside an echo chamber rarely engage with viewpoints that challenge their existing assumptions, which allows their original beliefs to grow increasingly extreme over time. For example, someone who frequently reads articles supporting one political party may begin to see the opposing party as entirely unreasonable, having never seriously considered its arguments. Political polarization, a significant issue in many countries today, is often linked to this pattern of selective exposure. Breaking out of an echo chamber requires ___________.

Online reviews have transformed the way consumers evaluate products before buying them. (A) Unfortunately, some of these reviews are not genuine, having been written by paid promoters rather than actual customers. (B) Shoppers now trust the opinions of strangers online almost as much as recommendations from friends or family. (C) For this reason, several platforms have started using technology to detect and remove suspicious reviews automatically.

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.

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.

주어진 문장: This pattern echoes what happened during previous waves of industrial automation. Self-driving technology is advancing rapidly, and its impact on the transportation industry is becoming increasingly visible. ( ① ) Companies are testing autonomous trucks that can travel long distances without human drivers, potentially transforming how goods move across countries. ( ② ) At the same time, millions of professional drivers worry about losing their jobs as automation spreads through the industry. ( ③ ) Experts predict that certain driving jobs, particularly long-distance trucking, may shrink significantly within the next two decades. However, new roles are also emerging, including remote vehicle operators and technicians who maintain the complex sensors these vehicles depend on. ( ④ ) Workers who adapt their skills toward supervising and maintaining these systems are likely to find new opportunities rather than face unemployment. ( ⑤ )