영어 모의고사 (자동 편성)

Long before humans learned to drill for oil, microorganisms had already mastered the art of ① converting sunlight and carbon dioxide into stored chemical energy. Modern biofuel research borrows this ability, cultivating algae or engineered bacteria in large tanks where they can be ② coaxed into producing oils and sugars that can be refined into fuel usable in existing engines. Unlike crops grown for corn-based ethanol, which compete directly with food production for arable land, many algae strains can ③ thrive in shallow ponds, wastewater, or even coastal seawater unsuitable for conventional agriculture. Engineers have also learned to tinker with the metabolic pathways of these organisms, ④ boosted oil yield far beyond what any wild strain would naturally produce on its own. Despite this progress, producing biofuel at a cost competitive with fossil fuel remains difficult, since harvesting and processing the organisms consumes a substantial share of the energy the fuel itself will eventually ⑤ provide.

Climate scientists frequently warn about tipping points, thresholds beyond which a small additional change ①triggers a large, often irreversible shift in the climate system. 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 ②absorb more sunlight than reflective ice, accelerating further melting in a self-reinforcing cycle. Similarly, scientists worry that a major ocean current, which currently ③redistributes heat across the planet, could slow dramatically if enough freshwater from melting glaciers dilutes the surrounding seawater. Once such thresholds are crossed, ④restoring the original balance may become nearly impossible, even if emissions are later reduced. Therefore, researchers argue that preventing these transitions ⑤matters more than merely slowing average temperature increases.

Placing small, inexpensive items near checkout counters ①tempts shoppers who are already waiting in line with little else to do. Online stores achieve a similar effect through countdown timers that create a ②true sense of urgency, suggesting that a deal will vanish within minutes. Bright colors, cheerful music, and pleasant scents are also carefully chosen to put customers in a ③relaxed mood, making them ④less likely to think critically about their spending. Shoppers who understand these strategies are better equipped to ⑤resist them.

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.

After a strenuous workout, muscle fibers experience thousands of microscopic tears, and the body immediately begins a repair process that depends heavily on amino acids, the building blocks that protein supplies. (A) Waiting too long to eat, however, can slow this recovery, since a muscle's sensitivity to amino acids gradually declines once that window closes. (B) Even so, eating an enormous quantity of protein in a single sitting will not speed things up any further, because the body can only use a limited amount at once, burning or storing the rest. (C) This is precisely why sports scientists recommend consuming protein within a couple of hours after a workout, while the muscle is still especially receptive to it.

The rise of autonomous vehicles has created both excitement and anxiety within the transportation industry. (A) In particular, long-distance trucking jobs are expected to shrink significantly as autonomous trucks become more common on highways. (B) At the same time, entirely new positions are emerging, such as remote operators who monitor fleets of self-driving vehicles from control centers. (C) On one hand, many professional drivers fear that automation will eliminate the jobs they currently depend on.

Because no alternative is ever removed, defenders insist that the intervention remains fully compatible with individual liberty. One of the most frequently cited nudge programs involves the redesign of cafeteria layouts to encourage healthier eating among students. ( ① ) Rather than banning unhealthy snacks outright, administrators simply relocate them to less convenient shelves while placing fruit and vegetables within easy reach. ( ② ) Students remain completely free to seek out the relocated items if they wish to do so. ( ③ ) Data collected across numerous schools show that this modest rearrangement increases the selection of healthier options by a meaningful margin, without any accompanying complaints about restricted choice. ( ④ ) Skeptics nonetheless point out that the very effectiveness of such nudges depends on exploiting the same mental shortcuts, such as convenience and visibility, that lead people to make less healthy choices in the first place. ( ⑤ ) Whether this exploitation is ethically troubling or simply a pragmatic use of known psychological tendencies remains a matter of ongoing disagreement.

This is precisely why an experienced athlete returning after an injury often regains sharp form faster than a complete beginner ever could. Anyone who has ridden a bicycle after a decade away from one has likely experienced muscle memory firsthand: the body seems to recall a complex skill almost instantly, even when conscious memory of the exact movements has faded. ( ① ) Contrary to what the name suggests, muscles themselves do not actually store memories; the phenomenon originates in the brain and nervous system, where repeated practice gradually shifts control of a well-learned movement from regions associated with conscious thought to areas that operate largely automatically. ( ② ) This shift explains why a skilled athlete can execute a complicated sequence of movements without consciously thinking through each individual step, freeing mental attention for strategy and decision-making instead. ( ③ ) Interestingly, research also suggests that these neural pathways can remain partially intact even after long periods without practice, which is why relearning a skill is typically much faster than learning it for the very first time. ( ④ ) Coaches often exploit this principle by ensuring that fundamental techniques are practiced correctly from the very beginning. ( ⑤ )

주어진 문장: Back then, few people could have predicted that such a job would even exist. When Mina graduated from college five years ago, she had never even heard the term "data scientist." ( ① ) She had studied statistics simply because she enjoyed solving puzzles with numbers. ( ② ) Everything changed when a small tech startup, which was building an app to predict traffic patterns, hired her to analyze massive amounts of data. ( ③ ) Mina quickly discovered that she loved turning raw numbers into insights that helped real people make better decisions. ( ④ ) Within two years, demand for professionals like her had exploded, as companies in every industry realized how valuable data could be. ( ⑤ ) Today, Mina leads a team of ten analysts, mentoring young graduates.

Static stretching, in which a muscle is held at its longest length for an extended period, can actually reduce the muscle's ability to generate explosive force immediately afterward. For decades, athletes were taught to stretch a muscle and hold the position before any competition, believing that this practice alone would prevent injury. ( ① ) Recent research, however, has complicated that assumption considerably. ( ② ) This is especially troubling for sprinters or jumpers who need maximum power right away. ( ③ ) Dynamic stretching, which involves controlled, repeated movement through a joint's full range of motion, appears to prepare muscles for activity without this temporary weakening effect. ( ④ ) As a result, many coaches now recommend saving static stretching for after a workout, while reserving dynamic movements for the warm-up period before intense effort begins. ( ⑤ )