영어 모의고사 (자동 편성)

문제 1

Bacteria have been cutting up invading viral DNA for billions of years, long before any scientist ①thought to borrow the trick for use in a laboratory. The CRISPR-Cas9 system, as it is now known, relies on a short guide RNA that matches a specific DNA sequence, ②lead a scissor-like enzyme called Cas9 directly to that exact location in the genome. Once Cas9 arrives at the target site, it slices both strands of the DNA helix, and the cell's own repair machinery rushes in ③to mend the cut, often introducing a small change in the process. By supplying the cell with a template during this repair step, scientists can direct that machinery ④to insert a specific new sequence rather than merely disabling the original gene. What once required years of painstaking work to alter a single gene can now, with a properly designed guide RNA, ⑤be accomplished within days, a shift in speed that has reshaped nearly every corner of biological research.

문제 2

Standard economic theory assumes that money is fungible, meaning that a dollar earned as salary is functionally ①identical to a dollar received as a tax refund or won in a lottery. In practice, however, people routinely sort their finances into separate mental accounts, treating money differently depending on its source or intended purpose. A household that would never dip into its retirement savings to pay for a vacation might nonetheless spend an unexpected bonus on that very trip without ②hesitation, even though both sums are, in strictly financial terms, equally available for either purpose. This ③compartmentalization can produce decisions that appear ④consistent when viewed through a purely rational lens: the same individual who diligently saves a portion of every paycheck may simultaneously carry high-interest credit card debt, effectively paying more to borrow than they earn on their savings. Mental accounting is not always harmful, however; by assigning specific categories to specific funds, individuals can also impose useful ⑤discipline on their spending, preventing money earmarked for essential needs from being diverted toward impulsive purchases.

문제 3

Most students only see the final result, a few ①smooth minutes each morning. Behind that short program, however, broadcasting club members follow a ②relaxed daily routine. Members arrive at school thirty minutes earlier than other students to prepare the studio. They check the microphones, the cameras, and the lighting before anyone else arrives. Meanwhile, the script team ③finalizes the news script that was written the night before. Once everything is ready, the anchors ④practice their lines one last time. At exactly eight o'clock, the red light turns on, and the live broadcast begins. During class hours, however, most members return to their regular classroom lessons like everyone else. After school, the club meets again to ⑤review that morning's recording and discuss any mistakes. Through this daily routine, members slowly learn skills such as teamwork and quick thinking under pressure.

문제 4

When the body fights off an infection, the immune system relies heavily on adequate sleep to function ①effectively. During deep sleep, the body produces and releases cytokines, proteins that help ②regulate immune responses and coordinate the fight against harmful invaders. People who consistently sleep fewer than six hours a night show measurably ③weaker antibody responses after vaccination compared with those who sleep seven or eight hours. Chronic sleep deprivation also appears to ④reduce low-grade inflammation throughout the body, a state that has been linked to a higher risk of heart disease. Rather than being a passive state, sleep functions as an active period during which the immune system repairs itself and ⑤prepares for future threats.

문제 5

For decades, athletes were taught to stretch a muscle and hold the position before any competition, believing that this practice alone would prevent injury. (A) Recent research, however, has complicated that assumption, since static stretching can actually reduce a muscle's ability to generate explosive force immediately afterward. (B) Dynamic stretching, by contrast, involves controlled, repeated movement through a joint's full range of motion and appears to prepare muscles for activity without this weakening effect. (C) 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.

문제 6

Our school will hold a special event to help students start the new year with clear goals. (A) On Friday, January 30th, every student is invited to share one personal goal in the main auditorium in front of classmates and teachers. (B) Each presentation should last no longer than two minutes and may include a poster or simple props to explain the goal clearly. (C) Students who wish to participate must submit a short outline to their homeroom teacher by January 23rd.

문제 7

She answered without hesitation, saying that architecture had been her dream since childhood. For a class project, I interviewed a local architect who has worked in the field for over fifteen years. ( ① ) I asked her why she chose this career. ( ② ) She explained that architects must balance creativity with practical concerns like safety and cost. ( ③ ) When I asked about challenges, she mentioned that clients sometimes change their minds after a design is finished. ( ④ ) She also advised students to visit construction sites whenever possible, since seeing a real building take shape teaches lessons no classroom can offer. ( ⑤ ) Her passion made me consider design as a possible career for myself.

문제 8

주어진 문장: Yet many people write down their goals at the beginning of the year and never check how far they have come. Setting a goal is only the first step; keeping track of progress is just as important. ( ① ) Without regular records, it becomes easy to lose motivation or forget the original purpose of a goal. ( ② ) Keeping a simple log, such as a weekly checklist or a short journal entry, lets a person see clear evidence of improvement over time. ( ③ ) For instance, someone learning guitar might record which songs they practiced each week, and looking back later reveals growth that felt invisible day to day. ( ④ ) Tracking progress also helps identify problems early, since a person can notice when effort stops producing results and adjust the plan before too much time is wasted. ( ⑤ )

문제 9

Because this feedback loop relies entirely on light rather than on the clock on the wall, melatonin release can shift dramatically when a person travels across time zones or works through the night. Melatonin is a hormone produced by a small gland deep within the brain, and its release follows a remarkably predictable daily pattern. ( ① ) Levels stay low throughout the bright hours of the day, begin rising in the evening as darkness falls, peak in the middle of the night, and then decline again as morning approaches. ( ② ) This rhythm is controlled primarily by light: specialized cells in the eye detect brightness and send signals that either permit or suppress melatonin production, which is why exposure to bright screens late at night can delay its release and make falling asleep more difficult. ( ③ ) Unlike some hormones that directly cause the body to perform a task, melatonin does not force sleep to occur; instead, it signals to the rest of the body that night has arrived, preparing various systems to shift into a lower-energy state. ( ④ ) Because of this signaling role, taking melatonin supplements at the wrong time can shift a person's internal clock in the opposite direction from what was intended. ( ⑤ )

문제 10

주어진 문장: That plan, however, took an unexpected turn during his final year of university. Jiho had always assumed he would join a large corporation after graduation, just as his parents expected. ( ① ) He joined a small student team building an app that connected local farmers directly with restaurants. ( ② ) What started as a class project gradually turned into something more serious, as several restaurants began placing regular orders through their prototype. ( ③ ) Jiho and his teammates decided to delay job applications and instead spend a year developing the idea, despite warnings from relatives who considered the plan too risky. ( ④ ) They worked from a cramped apartment, surviving on limited savings while learning skills ranging from coding to negotiating with suppliers. ( ⑤ ) After nearly failing twice, the team secured a small investment that allowed them to hire their first employee.