영어 모의고사 (자동 편성)

When an oil tanker ruptures and crude spreads across open water, cleanup crews increasingly reach not only for skimmers and floating booms but also for something far smaller: bacteria that ①eat oil. Certain naturally occurring microbes possess enzymes capable of ②breaking hydrocarbon molecules apart, using the carbon as an energy source and gradually converting a toxic slick into carbon dioxide and harmless byproducts. Bioremediation, as this approach is called, works far more slowly than mechanical cleanup, often ③taking months rather than days, but it can reach contamination trapped in soil or sediment that skimmers and booms can never reach. Scientists have learned to accelerate the process by adding nutrients ④that help native microbial populations multiply faster, or in some cases by introducing engineered strains selected specifically for their appetite for a particular pollutant. Because the method relies on living organisms rather than heavy machinery, it also tends ⑤leave a far gentler footprint on the surrounding ecosystem than excavation or chemical treatment ever could.

Memory researchers have long recognized that learning is not simply a matter of accumulating ① information without cost. Newly acquired material can collide with what the mind already holds, produce ② measurable disruptions in recall. When earlier knowledge interferes ③ with the retrieval of information learned afterward, psychologists call this proactive interference. This phenomenon explains why someone who memorized an old phone number for years may struggle to recall a new one. Conversely, when material learned later undermines the recollection of something acquired earlier, the process is labeled ④ retroactive interference. This second mechanism explains why switching to a new keyboard layout can temporarily impair typing on a familiar one. Both processes suggest that memories compete for the same limited retrieval pathways rather than resting in isolated compartments. This insight carries real implications for how students approach studying multiple similar subjects. Instead of cramming closely related material back to back, spacing out review sessions can reduce ⑤ competition between overlapping traces. Varying study contexts further helps preserve accuracy for both old and new information alike.

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 ①most closely associated with physical restoration. REM sleep, by contrast, brings rapid eye movements, near-total muscle paralysis, and brain activity that closely ②resemble wakefulness. Most vivid dreaming occurs during this stage, and researchers believe it ③plays 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 ④dominating the early hours and REM periods lengthening toward morning. Disrupting either stage, through frequent awakenings or alcohol use, can leave a person ⑤feeling unrested even after a full night in bed.

In our elective fashion design class, the first assignment was not to sketch a beautiful outfit but ①to design clothing for a specific, unusual situation, such as a rainy commute or a wheelchair user's daily routine. I initially found the assignment strange, since I ②had imagined fashion design as primarily about appearance rather than practical problem-solving. Researching my chosen situation, a delivery worker who bikes through the city in all weather, ③changing how I approached the project entirely. I realized that pockets needed to be reachable while cycling, that bright colors could improve visibility to drivers at night, and that waterproof fabric mattered more than any decorative detail I had originally planned. My final design looked far simpler than the elaborate sketches some classmates produced, yet our teacher ④praised it precisely because every choice solved a real problem the wearer would actually face. I finished the unit understanding that thoughtful design often begins with a person's needs, not with a ⑤striking image.

Many readers assume that once they finish a book, there is ①no reason to open it again. Yet teachers who study reading often disagree, arguing that a second reading can ②reveal details a first reading misses completely. During a first reading, most of a student's attention goes toward simply following the plot, wondering what will happen next. Once the ending is already known, a second reading frees the mind to notice ③smaller things, such as a clever hint the author placed early in the story or a change in a character's tone. Some students who reread their favorite novel report that it feels almost like reading the ④same book, because they now understand the characters' motives more deeply. Teachers therefore encourage students not to rush toward new titles alone, but to occasionally return to a book they already loved, since a second visit often teaches ⑤more than the first.

Walking through the old industrial district downtown, I noticed that a gray concrete wall had been transformed overnight into a wild swirl of color, letters, and cartoon figures. Some residents complained to the city office, calling it vandalism and demanding that workers paint over it immediately. Others argued that the same wall had been an ugly, forgotten eyesore for years, and that the graffiti artist had simply given it a voice no one else bothered to give it. This disagreement reveals a tension at the heart of street art: _______________. The line between vandalism and art, it seems, often depends less on the paint itself than on who gave permission to use the wall.

Imagine watching a fair coin land on heads five times in a row and feeling an increasingly strong intuition that the next flip is somehow due to produce tails. This intuition rests on a basic misunderstanding of probability, since each flip of a fair coin remains entirely independent of every flip that came before it. Casinos have long profited from this misconception, watching gamblers place larger bets after a losing streak simply because they mistakenly believe that a win has become statistically overdue. Economists have even documented the same error among trained professionals, including loan officers who grow more likely to approve a risky application simply because _______________.

A navigation app calculating a route rarely relies on distance alone; instead, it constantly weighs real-time traffic reports, past congestion patterns, and even data from other drivers' phones currently on the road. This flood of information allows the app to reroute a driver away from a sudden accident within seconds. The convenience comes at a cost that few passengers consider, however. When thousands of drivers are simultaneously redirected onto the same shortcut, _______________, arguing that an algorithm optimizing for individual convenience can end up creating a new, entirely different problem for the wider community.

This mismatch between internal time and local time is the true source of the problem, not the flight itself. Travelers who cross several time zones in a single flight often arrive feeling exhausted, foggy, and strangely out of sync with the local clock, a condition widely known as jet lag. ( ① ) The discomfort arises because the body's internal clock, which governs sleep, hunger, and alertness, continues to run on the schedule of the departure city even after landing. ( ② ) Realigning this internal clock to a new time zone is not instantaneous; researchers estimate that the body typically needs about one day to adjust for every time zone crossed. ( ③ ) Flying eastward tends to produce more severe symptoms than flying westward, because advancing the internal clock forward is generally harder for the body than delaying it. ( ④ ) Exposure to natural light at the right moments after arrival can help speed up the adjustment, since light is the strongest external cue the internal clock uses to reset itself. ( ⑤ ) Without such adjustments, travelers may continue to experience disrupted sleep and reduced concentration for several days after a long international flight.

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.