Đề thi thử số 1 — Reading 40 câu (có bài đọc)

Urban green spaces, including parks, gardens, and tree-lined streets, have become increasingly important in modern cities around the world. As urban populations continue to grow, city planners and public health experts are recognizing the numerous benefits that these natural areas provide to residents. From improving physical health to enhancing mental well-being, green spaces play a vital role in making cities more livable and sustainable.

One of the most well-documented benefits of urban green spaces is their positive impact on physical health. Studies have shown that people who live near parks and green areas tend to be more physically active. They are more likely to walk, jog, cycle, or engage in other forms of exercise. A large-scale study conducted in the Netherlands found that residents living within one kilometer of a green space had lower rates of heart disease, diabetes, and respiratory problems compared to those living farther away. The availability of green spaces encourages outdoor activities, which in turn helps reduce obesity rates and improve overall cardiovascular health.

Beyond physical health, urban green spaces have been shown to provide significant mental health benefits. Spending time in nature, even in a small city park, can reduce stress levels, lower anxiety, and improve mood. Researchers at the University of Exeter found that people who spent at least two hours per week in natural environments reported significantly better health and psychological well-being than those who did not. The calming effect of greenery, birdsong, and natural light helps people recover from the mental fatigue caused by busy urban lifestyles.

Green spaces also contribute to social cohesion within communities. Parks and gardens serve as gathering places where people from different backgrounds can meet, interact, and build relationships. Community gardens, in particular, have been praised for bringing neighbors together and fostering a sense of belonging. In many cities, these shared spaces host cultural events, farmers markets, and recreational activities that strengthen community bonds and reduce feelings of isolation, especially among elderly residents.

Furthermore, urban green spaces provide important environmental benefits. Trees and vegetation help absorb carbon dioxide and other pollutants, improving air quality in surrounding areas. Green spaces also help manage stormwater by absorbing rainfall, which reduces the risk of flooding in urban areas. Additionally, parks and gardens create habitats for birds, insects, and other wildlife, helping to maintain biodiversity even in densely populated cities. As cities face the challenges of climate change, the role of green spaces in cooling urban environments and reducing the heat island effect has become increasingly recognized.

The rise of electronic commerce, commonly known as e-commerce, has fundamentally transformed the way people buy and sell goods and services. What began as a novel concept in the mid-1990s with the launch of platforms like Amazon and eBay has grown into a multi-trillion-dollar global industry. Today, consumers can purchase virtually anything online, from groceries and clothing to electronics and even automobiles, often with the simple click of a button.

Several factors have driven the rapid growth of e-commerce. First, the widespread availability of the internet and smartphones has made online shopping accessible to billions of people worldwide. In developing countries, the proliferation of affordable mobile devices has been particularly significant, allowing consumers who may not have access to traditional retail stores to participate in the digital marketplace. Second, improvements in logistics and delivery services have made it possible for products to be shipped quickly and reliably, sometimes within hours of placing an order. Companies like Amazon have invested heavily in warehouse automation and last-mile delivery solutions, setting new standards for speed and efficiency.

The COVID-19 pandemic accelerated the shift toward e-commerce at an unprecedented pace. Lockdowns and social distancing measures forced millions of consumers to turn to online shopping for the first time. According to a report by the United Nations Conference on Trade and Development, global e-commerce sales surged from 16 percent of total retail sales in 2019 to 19 percent in 2020. Many of these new online shoppers continued their digital purchasing habits even after restrictions were lifted, suggesting that the pandemic permanently altered consumer behavior. Businesses that had previously relied solely on physical stores were compelled to develop online sales channels or risk being left behind.

Despite its many advantages, e-commerce presents several challenges that must be addressed. One major concern is the impact on traditional brick-and-mortar retailers, many of which have struggled to compete with the lower prices and greater convenience offered by online platforms. Shopping malls and small independent stores have seen declining foot traffic and revenue, leading to closures and job losses in many communities. Another significant issue is the environmental cost of e-commerce. The packaging materials used in shipping, combined with the carbon emissions from delivery vehicles, contribute to environmental degradation. Some companies have begun adopting sustainable packaging and carbon-neutral delivery options, but these initiatives remain limited in scope.

Looking ahead, the future of e-commerce will likely be shaped by emerging technologies such as artificial intelligence, augmented reality, and blockchain. AI-powered recommendation systems already help consumers discover products tailored to their preferences, while augmented reality tools allow shoppers to virtually try on clothing or visualize furniture in their homes before making a purchase. Blockchain technology promises to enhance the security and transparency of online transactions, potentially reducing fraud and building greater consumer trust. As these technologies continue to evolve, the boundary between online and offline shopping experiences will become increasingly blurred, creating new opportunities and challenges for businesses and consumers alike.

Coral reefs, often referred to as the rainforests of the sea, represent some of the most biologically diverse and productive ecosystems on the planet. Covering less than one percent of the ocean floor, these intricate structures support an estimated 25 percent of all marine species, providing essential habitats for fish, crustaceans, mollusks, and countless other organisms. Beyond their ecological significance, coral reefs contribute substantially to human economies through fisheries, tourism, and coastal protection, with their global economic value estimated at hundreds of billions of dollars annually.

The formation of coral reefs is a remarkably slow and complex process. Reefs are built by colonies of tiny animals called coral polyps, which secrete calcium carbonate to form hard external skeletons. Over thousands of years, successive generations of polyps build upon the skeletons of their predecessors, gradually creating the massive limestone structures we recognize as reefs. Most reef-building corals have a symbiotic relationship with microscopic algae known as zooxanthellae, which live within the coral tissue. These algae provide the coral with up to 90 percent of its energy through photosynthesis, and in return, the coral provides the algae with a protected environment and the compounds necessary for photosynthesis.

Climate change poses the most severe and far-reaching threat to coral reef ecosystems worldwide. As ocean temperatures rise due to increased greenhouse gas emissions, corals experience a phenomenon known as bleaching. When water temperatures exceed the normal range for an extended period, corals expel their symbiotic zooxanthellae, losing both their primary energy source and their characteristic color. If temperatures return to normal quickly, corals can recover by reabsorbing algae, but prolonged exposure to elevated temperatures leads to coral starvation and death. The global bleaching event of 2016-2017 affected approximately 75 percent of the world's tropical reefs, with the Great Barrier Reef in Australia suffering particularly devastating losses.

Ocean acidification, another consequence of rising carbon dioxide levels, compounds the challenges facing coral reefs. As the ocean absorbs excess CO2 from the atmosphere, its pH decreases, making the water more acidic. This increased acidity reduces the availability of carbonate ions that corals need to build their calcium carbonate skeletons. Research has demonstrated that under projected acidification scenarios, many coral species will struggle to maintain their structural integrity, potentially leading to the erosion of existing reef frameworks. The combined effects of warming and acidification create a particularly hostile environment for reef-building organisms, threatening the very foundation upon which these ecosystems depend.

Conservation efforts are underway to protect and restore coral reefs, though scientists acknowledge that addressing the root causes of climate change remains the most critical priority. Marine protected areas have been established in many regions to limit destructive fishing practices, pollution, and coastal development that further stress reef ecosystems. Innovative restoration techniques, including coral gardening and assisted gene flow, show promise in rebuilding degraded reefs. Researchers are also identifying and propagating heat-resistant coral strains that may be better equipped to survive in warming oceans. Nevertheless, experts warn that without significant reductions in global greenhouse gas emissions, even the most ambitious conservation programs will ultimately prove insufficient to prevent widespread reef collapse within the coming decades.

The question of how human language originated remains one of the most enduring and contentious puzzles in scientific inquiry. Unlike other aspects of human evolution, such as bipedalism or tool use, language leaves no direct fossil record. Spoken words do not petrify, and the soft tissues involved in speech production — the larynx, tongue, and lips — rarely preserve in archaeological contexts. Consequently, researchers must rely on indirect evidence, including comparative studies of primate communication, archaeological artifacts that may indicate symbolic thought, and the anatomical features of hominin fossils that suggest the capacity for complex vocalization.

Several competing theories attempt to account for the emergence of language. The gestural theory proposes that language evolved from manual gestures used by early hominins. Proponents point to the sophisticated sign languages used by modern great apes and the observation that human speech production is controlled by Broca's area, a brain region that also governs hand movements. According to this perspective, vocal language gradually supplanted gesture as hands became increasingly occupied with tool manufacture and other manual tasks. The vocal grooming hypothesis, advanced by anthropologist Robin Dunbar, suggests that language evolved as a more efficient substitute for the physical grooming that primates use to maintain social bonds. As hominin social groups grew larger, Dunbar argues, the time required for one-on-one grooming became prohibitive, and vocal communication emerged as a means of simultaneously maintaining relationships with multiple group members.

The discovery of the FOXP2 gene in the late 1990s provided the first concrete molecular evidence linked to language capacity. Mutations in this gene cause severe speech and language disorders in humans, and comparative genomic analyses revealed that the human version of FOXP2 differs from that of chimpanzees by only two amino acid substitutions — changes that occurred approximately 200,000 years ago, roughly coinciding with the emergence of anatomically modern Homo sapiens. However, subsequent research has complicated the initial interpretation of FOXP2 as a straightforward "language gene." The gene is expressed in numerous tissues beyond the brain, including the lungs and digestive system, and plays roles in neural plasticity and motor learning more broadly. Furthermore, Neanderthals possessed the same derived variant of FOXP2 found in modern humans, raising intriguing questions about whether these archaic hominins also possessed some form of language.

Archaeological evidence provides additional, albeit circumstantial, clues about the timeline of language emergence. The appearance of symbolic artifacts — including ochre pigments used for body decoration, perforated shell beads, and abstract engravings on bone — in the African archaeological record dating to approximately 100,000 years ago is frequently cited as evidence of the symbolic cognition that underlies language. The subsequent explosion of cave art, carved figurines, and elaborate burial practices in Europe around 40,000 years ago has been interpreted by some researchers as reflecting a fully modern linguistic capacity. Critics of this interpretation caution, however, that the absence of symbolic artifacts in the archaeological record does not necessarily indicate the absence of language, as early forms of linguistic expression may have left no material trace whatsoever.

Contemporary research increasingly favors a gradualist model of language evolution over the notion that language emerged suddenly through a single genetic mutation or cognitive breakthrough. This perspective holds that the various components of language — including phonological processing, syntactic structure, semantic representation, and pragmatic competence — evolved incrementally over millions of years, with each component building upon pre-existing cognitive and communicative capacities shared with other primates. The challenge for researchers lies in reconstructing this evolutionary trajectory from the fragmentary evidence available, a task that demands collaboration across disciplines ranging from genetics and neuroscience to archaeology and linguistic theory. Despite decades of intensive research, the origin of language remains, as the linguist Noam Chomsky once observed, a mystery that may never be fully resolved.