영어 모의고사 (자동 편성)

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. 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. This is the period ① most closely associated with physical restoration. REM sleep, by contrast, brings rapid eye movements, near-total muscle paralysis, and brain activity that closely ② resemble wakefulness. Most vivid dreaming occurs during this stage, and researchers believe it ③ plays a central role in consolidating memories and processing emotional experiences. A healthy night typically cycles through both stages four or five times, with non-REM ④ dominating the early hours and REM periods lengthening toward morning. Disrupting either stage, through frequent awakenings or alcohol use, can leave a person ⑤ feeling unrested even after a full night in bed.

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. 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. However, researchers caution strongly against interpreting these findings as evidence that athletic greatness is simply inherited, since _______________. 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.

When Minji was in ninth grade, she posted a joking comment mocking a classmate's photo, never imagining anyone would remember it later. Last spring, she applied to join her school's student council, hoping her leadership experience would impress the selection committee. During the interview, however, one teacher mentioned having seen an old, unkind comment under Minji's name while reviewing applicants' profiles. Startled, Minji realized that everything she had ever posted online had quietly accumulated into what is called a digital footprint, a lasting trail of personal data left behind by online activity. Although she deleted the comment immediately, the damage to her reputation had already been done. She understood that digital footprints ___________.

Climate scientists frequently warn about tipping points, _______________. Unlike gradual warming, which unfolds steadily over decades, crossing a tipping point can produce dramatic consequences within a short period. For instance, as Arctic ice melts, it exposes darker ocean water that absorbs more sunlight than reflective ice, accelerating further melting in a self-reinforcing cycle. Similarly, scientists worry that a major ocean current, which currently redistributes heat across the planet, could slow dramatically if enough freshwater from melting glaciers dilutes the surrounding seawater. Once such thresholds are crossed, restoring the original balance may become nearly impossible, even if emissions are later reduced. Therefore, researchers argue that preventing these transitions matters more than merely slowing average temperature increases. Identifying how close each system stands to its threshold remains one of the most urgent challenges in climate research.

A flexitarian is someone who mainly eats plant-based meals but occasionally includes meat or fish, unlike a strict vegetarian who avoids animal products entirely. This flexible diet has recently gained attention as a practical way to fight climate change, since raising livestock produces a significant portion of global greenhouse gas emissions. Cattle, in particular, release large amounts of methane, a gas far more powerful than carbon dioxide at trapping heat in the atmosphere. By replacing just a few meat-based meals each week with vegetables, grains, or legumes, individuals can noticeably shrink their carbon footprint without giving up meat completely. Nutritionists also emphasize that flexitarian eating is easier to maintain than full vegetarianism, because it allows flexibility rather than demanding absolute discipline. Therefore, many environmental groups now promote flexitarianism as a realistic first step, believing that _______________.

Planning a multi-city trip once meant hours spent comparing flight schedules, reading hotel reviews, and mapping out which sights were close enough to visit in a single day. (A) Many travelers appreciate having a solid starting point rather than a blank page. (B) Still, seasoned travelers warn that these itineraries can feel oddly generic, often steering users toward the same popular landmarks that every other AI-generated plan recommends. (C) AI travel planners now compress much of that work into a short conversation, generating a full day-by-day itinerary within minutes based on enormous amounts of data.

People rarely realize how many different roles they play throughout an ordinary day. (A) A single online post, however, reaches all of these audiences simultaneously, blending roles that were once kept apart. (B) They might act formally with a manager, casually with old friends, and gently with a younger sibling, switching tones without much thought. (C) This blending, known as context collapse, can leave posters uncertain about which version of themselves to display.

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

주어진 문장: The financial and reputational damage caused by a single attack can be enormous. As more businesses move their operations online, cyberattacks have become one of the most serious threats facing modern companies. ( ① ) Hackers now target everything from small retail websites to massive financial institutions, stealing sensitive data or demanding ransom payments. ( ② ) In response, demand for cybersecurity professionals has surged across nearly every industry. ( ③ ) These specialists design systems that detect suspicious activity, patch vulnerabilities before criminals can exploit them, and train employees to recognize phishing attempts. ( ④ ) Universities have responded by creating specialized degree programs, while many companies now offer scholarships to attract students into this growing field. ( ⑤ ) Despite this expansion, experts estimate that millions of cybersecurity positions worldwide remain unfilled.

주어진 문장: Because the videos looked completely unscripted, audiences trusted them in a way that polished commercials rarely achieve. When a beverage company launched a new flavor last summer, the marketing team faced a tight budget and needed a creative solution. ( ① ) Instead of relying on expensive television commercials, they designed a simple dance challenge and invited a handful of everyday users to post videos using the product. ( ② ) Within days, thousands of people began recreating the dance and tagging the brand, turning an ordinary product launch into a viral trend. ( ③ ) Because participants created the content themselves, viewers found the videos far more entertaining than a traditional advertisement would have been. ( ④ ) The company barely spent any money on production, yet the challenge reached millions of viewers across multiple platforms. ( ⑤ ) Encouraged by this success, other brands quickly attempted similar challenges, though many failed to generate the same excitement.