영어 모의고사 (자동 편성)

Have you ever noticed your mood ①shifting after scrolling through a friend's gloomy post online? This phenomenon, known as emotional contagion, ②refers to the tendency of one person's feelings to spread to others nearby, almost like a cold passing between classmates. However, researchers have discovered that emotional contagion also occurs online, where only text or images ③are exchanged, without any physical presence at all. For instance, when someone posts a negative comment beneath a cheerful photo, the comments that follow often ④turning noticeably more negative in tone. In contrast, a single kind comment ⑤can shift an entire thread toward positivity within minutes.

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.

Modern sports wearables, from wrist-worn fitness trackers to smart insoles ① embedding in running shoes, continuously collect data that would once have required a laboratory to measure. Heart rate, sleep quality, running cadence, and even subtle changes in gait can now ② be monitored during ordinary daily activity rather than only in a controlled clinical setting. Coaches use this constant stream of information to ③ detect early warning signs of overtraining, sometimes noticing a decline in performance before the athlete consciously feels tired. However, the flood of data has created a new challenge: distinguishing a meaningful pattern from ordinary daily fluctuation ④ requires expertise that many amateur athletes simply do not have. For this reason, most experts recommend ⑤ treating wearable data as a general trend to observe over time, not as a precise diagnostic tool.

Many companies today advertise their products as environmentally friendly, yet not all of these claims are accurate. This practice, known as greenwashing, involves exaggerating or fabricating a product's positive impact on the environment. Some brands print vague terms such as "natural" or "eco-conscious" on packaging without providing any evidence to support these labels. Consumers, who are increasingly concerned about climate change, often trust such claims without questioning them closely. As a result, they may pay higher prices for products that are no more sustainable than ordinary alternatives. Genuine environmental efforts, which usually require significant investment and long-term planning, are far more costly than simply changing a label. Therefore, governments should establish clear standards that require companies to ___________.

Generation Z, typically defined as those born between the late 1990s and early 2010s, approaches shopping quite differently from previous generations. Having grown up with smartphones and social media, they research products extensively online before making even small purchases. Unlike older generations, who often valued brand loyalty above all else, many members of Generation Z prioritize a company's values, switching brands easily if one no longer matches their beliefs. They also tend to favor secondhand and resale platforms, viewing sustainability as an important factor rather than an afterthought. Peer recommendations shared through short videos frequently carry more weight than traditional celebrity endorsements. Businesses that fail to adapt to these preferences risk losing an entire generation of potential customers. Consequently, many companies now ___________.

That two- or three-hour gap may look modest on paper, but its effects accumulate quickly, touching everything from mood to memory. 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. ( ① ) Part of the problem lies in biology: as puberty begins, the body's internal clock naturally shifts later, making it difficult for teenagers to fall asleep before eleven at night. ( ② ) Yet school start times rarely adjust to this shift, forcing students to wake before their bodies are ready. ( ③ ) The consequences extend well beyond simple tiredness. Chronic sleep loss during adolescence has been linked to impaired concentration, weakened memory, and a higher risk of anxiety and depression. ( ④ ) It can also disrupt the hormones that regulate appetite, contributing to unhealthy weight gain over time. Some school districts have experimented with delaying start times by even thirty minutes, and early results suggest that students who gain that extra rest show improved grades, better mood, and fewer tardy arrivals. ( ⑤ ) Despite this evidence, changing entrenched school schedules remains a slow and contentious process.

This is precisely what makes the condition so difficult to catch before it becomes severe. Ambitious young athletes and the parents who support them sometimes assume that more training automatically produces better results, a belief that occasionally leads to a condition known as overtraining syndrome. ( ① ) Unlike ordinary fatigue that resolves after a few days of rest, overtraining syndrome develops gradually over weeks or months of insufficient recovery relative to training load, eventually producing persistent exhaustion, declining performance despite continued hard work, and increased susceptibility to illness and injury. ( ② ) Adolescents may be especially vulnerable, since their bodies are simultaneously coping with the physical demands of growth and the added stress of intensive training schedules. ( ③ ) Warning signs are often subtle at first, including disrupted sleep, irritability, and a loss of enthusiasm for a sport the athlete once genuinely enjoyed, which adults often mistake for ordinary moodiness. ( ④ ) Recovery from full-blown overtraining syndrome can take months rather than days. ( ⑤ )

This built-in schedule does not simply respond to the clock on the wall; it is shaped directly by light itself. Every cell in the human body follows an internal timer known as the circadian rhythm, a roughly twenty-four-hour cycle that governs when we feel alert and when we feel drowsy. ( ① ) This clock is regulated primarily by a tiny cluster of neurons in the brain that responds to light entering through the eyes. ( ② ) When morning sunlight strikes the retina, the cluster signals the body to suppress sleep hormones and raise body temperature, preparing us for activity. ( ③ ) As evening approaches and light fades, the same mechanism triggers the release of melatonin, a hormone that promotes drowsiness. ( ④ ) Because this rhythm evolved around the natural cycle of day and night, modern habits such as staying indoors under artificial light or working night shifts can push the internal clock out of sync with the external environment. ( ⑤ ) Such misalignment does not simply cause tiredness; it has also been associated with digestive problems and reduced concentration, suggesting that timing matters as much as total sleep hours.

In other words, the body keeps a running total rather than resetting each day. Sleep debt refers to the cumulative gap between the amount of sleep a person needs and the amount they actually get. ( ① ) Unlike a financial debt, however, this deficit cannot simply be repaid with a single long weekend of rest. ( ② ) When someone loses two hours of sleep every night for a week, the body does not treat the shortage as fourteen separate small losses; instead, it accumulates the deficit, and the resulting impairment in attention and mood can resemble that of a person who has been awake for an entire night. ( ③ ) Researchers have found that even modest, chronic sleep restriction gradually impairs reaction time and decision-making, often without the affected person noticing the decline. ( ④ ) This is because subjective feelings of tiredness tend to plateau after a few days, even as objective performance keeps deteriorating. ( ⑤ ) Consequently, people frequently underestimate how much sleep debt they are carrying until a demanding task suddenly exposes the accumulated cost.

Genetic potential, in other words, is merely a starting point, never a finished product. Scientists have identified certain gene variants that appear more frequently among elite endurance athletes than among the general population, along with a separate set that seems to favor explosive, power-based sports such as sprinting. ( ① ) One frequently studied variant, for instance, influences the proportion of slow-twitch versus fast-twitch muscle fibers a person naturally develops, a ratio that shapes whether a body leans toward endurance or explosive power. ( ② ) However, researchers caution strongly against interpreting these findings as evidence that athletic greatness is simply inherited. ( ③ ) Even athletes who carry every favorable variant identified so far still require years of disciplined training to translate that genetic potential into actual performance, and many elite competitors lack some of these supposedly advantageous variants altogether. ( ④ ) Genetics may set a rough ceiling on an individual's ultimate potential, but where any particular athlete lands within that range depends overwhelmingly on training quality, nutrition, coaching, and sheer determination. ( ⑤ )