영어 모의고사 (자동 편성)

Caffeine is the most widely consumed stimulant in the world, ①prizing for its ability to 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 ②makes us feel increasingly sleepy the longer we stay awake. By occupying the receptors that adenosine would normally bind to, caffeine tricks the brain into ③feeling 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 ④consumed in the late afternoon may still be interfering with the ability to fall asleep at midnight. Even when people do not consciously notice difficulty falling asleep, caffeine has been shown ⑤to reduce the amount of deep, restorative sleep obtained later in the night.

Students often groan when a classic novel appears on their reading list, complaining that the language feels old-fashioned and the plot moves too ①slowly. It is true that classic literature can be ②easier to read than a modern bestseller written in casual, everyday language. Yet this very difficulty is part of why classics remain valuable for young readers today. Working through unfamiliar sentence patterns and vocabulary trains the brain to handle ③complex texts, a skill that transfers directly to other subjects and to standardized tests. Beyond language training, classic novels also explore themes such as jealousy, ambition, and loss that have not changed much across ④centuries. Readers often discover that a character written hundreds of years ago struggles with feelings that still feel ⑤familiar today.

After an especially demanding training session, the instinct to collapse onto a couch and remain motionless is understandable, yet exercise physiologists increasingly recommend the ①opposite 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. This gentle activity keeps blood circulating through tired muscles, which appears to help ②clear metabolic byproducts that accumulate during hard exercise more efficiently than complete stillness does. Some athletes worry that any movement at all will interfere with the repair process, but research suggests that truly light activity ③accelerates healing considerably and may even reduce the perceived soreness that follows a hard session. The key distinction lies entirely in ④intensity: active recovery is not a second workout in disguise but a deliberately gentle session designed to support, rather than compete with, the body's underlying repair ⑤mechanisms.

Aerobic exercise, such as jogging, swimming, or cycling at a steady pace, strengthens the heart by forcing it to pump ①larger 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 ②fewer times per minute. This adaptation explains why trained athletes often have a much ③lower 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, ④worsening the delivery of oxygen and nutrients at a cellular level. Researchers have also found that regular aerobic exercise ⑤reduces inflammation throughout the body and improves the way cells respond to insulin.

Every summer, lifeguards repeat the same warnings to swimmers, yet drowning remains one of the most common causes of accidental death among teenagers. Part of the problem is that _______________, which means bystanders may not realize help is needed until it is too late. Rip currents present a particularly deceptive threat, since the water's surface can appear calm even while a powerful current pulls a swimmer steadily away from shore.

A short nap taken in the early afternoon, often called a power nap, can noticeably sharpen attention and mood without leaving a person groggy afterward. The key lies in timing: naps limited to roughly twenty minutes allow the brain 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, _______________. Laboratory studies 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 effective. For this reason, many workplaces now designate quiet rooms where employees can recharge briefly during the day.

Where structural functionalism emphasizes cooperation and stability, conflict theory begins from the premise that society is best understood as an ongoing struggle between groups with competing interests over scarce resources such as wealth, power, and prestige. (C) Later sociologists broadened the framework well beyond economic class, applying conflict analysis to struggles organized around race, gender, and other categories of unequal social power. (A) Rooted in the writings of Karl Marx, classical conflict theory focused on the economic struggle between those who own productive resources and those who must sell their labor to survive. (B) Unlike functionalists, who often interpret existing social arrangements as serving a necessary purpose, conflict theorists argue that apparent social order frequently masks underlying tension that dominant groups actively work to contain.

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. (A) In response, some school districts have experimented with delaying start times, and early results suggest that students who gain extra rest show improved grades and better mood. (B) As a result, chronic sleep loss during adolescence has been linked to impaired concentration, weakened memory, and a higher risk of anxiety and depression. (C) Part of the problem lies in biology, since the body's internal clock naturally shifts later during puberty, while school start times rarely adjust to match.

A student who loves writing and also shows strong language skills, for example, might consider journalism. When choosing a future career, students often face a common question: should I follow what I love, or what I am good at? ( ① ) Passion can provide strong motivation, pushing a person to practice for hours without feeling tired. ( ② ) However, loving an activity does not always mean a person will become skilled at it professionally. ( ③ ) Career experts suggest looking for an overlap between the two instead of choosing only one side. ( ④ ) Finding this balance takes time and self-reflection, but it often leads to a more satisfying and sustainable career than focusing on passion or talent alone. ( ⑤ )

In other words, the two stages appear to serve complementary purposes, one restoring the body and the other restoring the mind. Sleep is not a single, uniform state but a cycle that alternates between two very different modes: REM (rapid eye movement) sleep and non-REM sleep. ( ① ) During non-REM sleep, especially its deepest stage, the brain waves slow down dramatically, the body temperature drops, and tissue repair and growth hormone release reach their peak. ( ② ) This is the period most closely associated with physical restoration. ( ③ ) REM sleep, by contrast, brings rapid eye movements, near-total muscle paralysis, and brain activity that closely resembles wakefulness. ( ④ ) Most vivid dreaming occurs during this stage, and researchers believe it plays a central role in consolidating memories and processing emotional experiences. ( ⑤ ) A healthy night typically cycles through both stages four or five times, with non-REM dominating the early hours and REM periods lengthening toward morning. Disrupting either stage, through frequent awakenings or alcohol use, can leave a person feeling unrested even after a full night in bed.