영어 모의고사 (자동 편성)

Scientists have long searched for a way to describe, in a single coherent framework, the outer limits within ①which human activity can safely continue without destabilizing the planet's fundamental systems. The concept of planetary boundaries, ②introduced by earth-system researchers, identifies nine interconnected processes, including climate change, biodiversity loss, and nitrogen pollution, each ③possessing a threshold beyond which abrupt and irreversible change becomes likely. Unlike conventional environmental limits, often defined locally, these boundaries are framed at a planetary scale, ④reflecting the idea that the Earth functions as a single interdependent system rather than a collection of isolated regions. Crossing one boundary, proponents argue, does not merely damage the system involved but can also destabilize others, since climate, oceans, and land are bound together by feedback loops that transmit disturbance across the system. Some philosophers have likened this framework to a ship's safe operating margin, within which passengers may move freely without risking the vessel's stability. Critics, however, contend that the boundaries ⑤is drawn with more confidence than the data can support.

A biosensor works by pairing a biological component, such as an enzyme or antibody, with an electronic device that converts a biological reaction into a signal a computer can ①read. When the target molecule, whether glucose in blood or a trace of a pathogen, binds to the biological component, it triggers a ②massive measurable change that the device translates into a readable number. This design has already transformed diabetes management, letting patients monitor blood sugar ③continuously through a small sensor worn under the skin rather than pricking a finger several times a day. Engineers are now racing to extend the same principle to detect subtler targets, from cancer cells circulating in the bloodstream to trace ④contaminants in drinking water. The central challenge is not detecting the target but doing so reliably outside a controlled laboratory, since a sensor that performs well on a clean lab bench can behave ⑤erratically once exposed to a real body or a real river.

Imagine a teleportation device that scans every atom in your body, transmits that information to a distant station, and reconstructs an exact physical duplicate there, while destroying the original body in the process. From the traveler's point of view, stepping into the machine and stepping out on the other side would feel utterly ①seamless, complete with continuous memories and a sense of having simply walked through a door. Philosophers, however, are troubled by a version of the same device that malfunctions: instead of destroying the original, it leaves the original body intact while still creating a perfect duplicate elsewhere. Now two people exist, each with ②identical memories and an equally strong claim to being the original traveler, and there is ③a clear and principled way to say that one of them is the real continuation of the person who entered the machine. This malfunction reveals that memory and psychological continuity alone cannot fully ④settle what personal identity actually requires, a puzzle that remains ⑤unresolved to this day.

A printer that once produced only plastic prototypes can now deposit living cells layer by layer to build a structure that begins to ①resemble actual tissue. Bioprinting adapts the logic of conventional 3D printing, replacing plastic filament with a ②specialized ink made of living cells suspended in a gel that supports their survival while the shape sets. Printing a flat patch of skin or a simple blood vessel has already moved from laboratory curiosity to early clinical testing, since these tissues are thin enough for nutrients to reach every cell by ③diffusion. Printing a solid organ such as a kidney remains a far greater challenge, because internal cells ④thrive without their own blood supply, and no printer yet exists that can build a network of vessels fast enough to keep them alive. Researchers are therefore focusing on hybrid strategies, printing a rough scaffold and then allowing the tissue to mature and grow its own vasculature over ⑤time.

Among the many strategies proposed to remove carbon dioxide from the atmosphere, one of the oldest draws on an agricultural technique predating modern industry, converting organic material into a ①stable form of charcoal known as biochar. Biochar is produced through pyrolysis, a process in which crop residues or wood chips are heated in an environment with little or no oxygen, preventing the material from burning away as in an open fire. This process leaves behind a carbon-rich solid that ②accelerates decomposition far longer than raw organic matter, locking carbon in a form remaining stable in soil for centuries. When mixed into farmland, biochar also improves soil structure, retaining moisture and nutrients otherwise lost, which can ③boost crop yields in depleted soils. For example, farmers cultivating nutrient-poor tropical soils have reported ④measurable increases in productivity after adding biochar. Nevertheless, researchers caution that the climate benefits of biochar depend on the feedstock and method used, since poorly managed pyrolysis can release as much carbon as it sequesters, ⑤undermining its own purpose.

When a country physician named Edward Jenner noticed that milkmaids who had caught cowpox seemed immune to smallpox, he set in motion a medical revolution without fully understanding why it worked. _______________. This method produced genuine successes, eventually eliminating smallpox worldwide and reducing diseases such as polio and measles, but each new vaccine still required years of laboratory work with no guarantee of success. Advances in molecular biology eventually allowed researchers to isolate a single protein from a pathogen's surface rather than using the whole organism, producing vaccines with fewer side effects and a more predictable safety profile. The most recent shift, toward delivering genetic instructions rather than proteins themselves, represents the latest chapter in a story that began with an eighteenth-century doctor's curiosity about a puzzling immunity among dairy workers.

The human gut hosts trillions of microorganisms whose combined genetic material outnumbers that of the human genome itself many times over. (A) A microbiome disrupted by antibiotics, poor diet, or chronic stress can leave the gut lining more permeable than it should be, allowing substances to leak into the bloodstream that would normally stay contained. (B) Once dismissed as passive hitchhikers, these bacteria are now understood to actively shape digestion, regulate immune responses, and even influence the production of chemicals that affect mood and behavior. (C) Researchers studying this connection have found that transplanting gut bacteria from a healthy donor into a patient can relieve symptoms of certain digestive disorders, though the microbiome varies enormously between individuals, so a treatment that helps one person's gut may do little for someone else's.

주어진 문장: Yet whether this incentive actually translates into real-world design changes remains a matter of considerable dispute. Extended producer responsibility, a policy requiring manufacturers to bear responsibility for their products even after use, has been adopted by governments seeking to reduce landfill waste. ① Under such schemes, companies must finance the collection and recycling of goods once consumers discard them, rather than leaving municipalities to absorb the cost. ② Advocates maintain that shifting this burden onto producers creates a powerful incentive to design products that are more durable, easily disassembled, and readily recyclable from the outset. ③ Critics counter that the policy, whatever its theoretical merits, often fails to reduce waste meaningfully unless paired with rigorous enforcement and transparent reporting requirements. ④ For instance, some manufacturers merely pass the added cost of compliance on to consumers, without making substantive changes to how products are designed. ⑤ In contrast, jurisdictions that combine producer responsibility with strict eco-design standards and independent audits tend to witness genuine improvements in recyclability. Therefore, policymakers hoping to harness this approach must resist treating it as self-executing and instead invest in oversight that determines whether producers actually change behavior. ① ② ③ ④ ⑤

Even so, the shift has proven immensely practical, sidestepping the objection that halted so much earlier research. A single fertilized egg eventually gives rise to every cell type in the human body, from neurons to bone, a feat that has fascinated biologists for more than a century. ( ① ) Embryonic stem cells retain much of that original versatility, capable in principle of developing into almost any tissue, which is why researchers have long viewed them as a promising raw material for repairing damaged organs. ( ② ) Because harvesting these cells traditionally required destroying a human embryo, the research provoked ethical objections fierce enough to slow funding and legislation in several countries for years. ( ③ ) A breakthrough arrived when scientists discovered that ordinary adult skin cells could be reprogrammed, through the introduction of a handful of specific genes, into a state resembling embryonic versatility without ever touching an embryo. ( ④ ) These induced pluripotent cells, as they are now called, have not entirely erased the ethical debate. ( ⑤ ) They have opened a path for stem cell research that far more scientists and funding agencies are willing to support.

Every one of those clones, remarkably, is a perfect genetic copy of the original. The immune system produces an almost limitless variety of antibodies, each shaped to latch onto one particular molecular target with remarkable specificity. ( ① ) Monoclonal antibody drugs harness this natural precision by cloning a single antibody-producing cell in the laboratory. ( ② ) The result is an army of identical antibodies built to recognize one target, such as a protein on a cancer cell or a molecule driving an autoimmune disease. ( ③ ) Because the antibody binds only to its intended target, these drugs tend to spare healthy tissue far more effectively than traditional chemotherapy, which attacks any rapidly dividing cell regardless of whether it is cancerous. ( ④ ) Manufacturing monoclonal antibodies remains far more complicated than producing a conventional small-molecule pill, since living cells must be cultivated in carefully controlled bioreactors for weeks before the antibody can be purified and prepared for use. ( ⑤ ) This complexity keeps monoclonal antibody treatments considerably more expensive than most conventional drugs, a cost that continues to shape debates over pricing and access.