Tüm alıştırma soruları

Sourdough bread is made by fermenting dough using naturally occurring lactobacilli and yeast. To maintain a sourdough starter, a baker must regularly "feed" the mixture with fresh flour and water. If the starter is kept at room temperature, it must be fed daily to keep the wild yeast active and healthy.

The writer is considering adding the following sentence to the paragraph:

"Yeast is also used in the fermentation process to brew beer and produce biofuels."

Should the writer make this addition?

The sandwich is named after John Montagu, the 4th Earl of Sandwich. According to legend, Montagu was an avid gambler who did not want to leave the gaming table to eat. He ordered his valet to bring him meat tucked between two slices of bread, allowing him to play cards and eat at the same time. Playing cards first became popular in Europe during the late fourteenth century. This convenient meal option quickly grew in popularity among his peers, eventually becoming a staple of modern cuisine.

The writer is considering deleting the underlined sentence. Should the sentence be kept or deleted?

The following passage is about the discovery of pulsars.

In 1967, astrophysicist Jocelyn Bell Burnell detected a series of anomalous, highly regular radio pulses while analyzing data from a newly constructed radio telescope. The signals were so precise, repeating every 1.33 seconds, that Bell Burnell and her advisor, Antony Hewish, jokingly designated the source 'LGM-1' (for 'Little Green Men'). Hewish was later awarded the 1974 Nobel Prize in Physics for the discovery, an honor that many astronomers believed Bell Burnell should have shared. However, as similar pulses were soon observed in other regions of the sky, the researchers concluded that the signals had a natural, celestial origin rather than an extraterrestrial one. These objects, named 'pulsars,' are now understood to be rapidly rotating neutron stars emitting beams of electromagnetic radiation.

The writer is considering deleting the underlined sentence from the passage. Should the writer make this deletion?

[1]
In 1947, Marjory Stoneman Douglas published *The Everglades: River of Grass*, a book that fundamentally redefined how the public viewed the vast wetlands of southern Florida. For decades prior, developers and politicians had viewed the Everglades as a useless swamp to be drained for agriculture and real estate. Douglas, however, argued that the Everglades was a dynamic, slow-flowing river vital to the state's ecological health.

[2]
Her book combined scientific detail with poetic prose to describe the unique ecosystems of the region, from the sawgrass marshes to the mangrove forests. She explained how the flow of fresh water from Lake Okeechobee sustained a rich array of wildlife. More importantly, she warned that disrupting this delicate balance would threaten the region’s fresh water supply, which millions of residents depended upon.

[3]
Following the publication of the book, Douglas spent the remaining decades of her life campaigning for the protection of the Everglades. She founded the organization Friends of the Everglades in 1969 to mobilize public opposition to a proposed jetport in the Big Cypress Swamp. Her tireless advocacy helped shift national policy toward restoration, cementing her legacy as a pioneering figure of the modern environmental movement.

Suppose the writer's goal had been to write an essay that details the specific legislative policies enacted by the United States Congress to fund the ecological restoration of the Florida Everglades. This goal is successfully achieved by the essay.

[1] Every autumn, millions of monarch butterflies in eastern North America embark on a remarkable journey to their overwintering sites in the mountain forests of central Mexico. [2] Traveling up to 3,000 miles, these delicate insects rely on thermal air currents and a sophisticated internal compass to navigate. [3] The destination of this migration was a mystery to scientists until 1975, when researchers finally located the specific oyamel fir forests where the monarchs cluster. [4] These forests provide a unique microclimate that protects the butterflies from freezing temperatures and wet weather. [5] Oyamel firs, also known as sacred firs, are native to the high-altitude mountains of central and southern Mexico.

The writer is considering deleting Sentence 5 from the passage. Which of the following decisions and justifications is most appropriate regarding this potential deletion?

The sentence below contains a nonessential phrase that begins with a dash. To ensure grammatical correctness and punctuation consistency, which punctuation mark should be placed in the blank to close this nonessential phrase?

For centuries, Mayan hieroglyphs remained a profound mystery to scholars who struggled to decipher the complex symbols. A breakthrough came when Yuri Knorozov, a Soviet linguist, proposed that the glyphs that were carved in stone, which had puzzled scholars for years, could finally be deciphered using a phonetic key.

Which choice best punctuates the underlined portion of the sentence?

Ada Lovelace was a visionary mathematician who is widely celebrated today for her work on Charles Babbage’s mechanical computer.

[1] __________________________________________________ She appended a set of notes that was longer than the article itself. These notes included what is now recognized as the first computer program: an algorithm designed to calculate Bernoulli numbers. Lovelace saw that Babbage’s machine could do more than just compute numbers; she envisioned it processing symbols, music, and art, laying the conceptual groundwork for modern computing.

Which choice most effectively introduces the paragraph?

[1] In 1858, Hymen Lipman patented the first pencil with an attached eraser. [2] Before this invention, writers had to carry separate pieces of rubber or use breadcrumbs to erase mistakes. [3] Rubber trees are native to South America and produce latex when their bark is cut. [4] Lipman’s design made writing far more convenient by combining two essential tools into one.

The writer is considering deleting Sentence 3 from the paragraph. Should this sentence be deleted?

Passage Excerpt:

In 1964, radio astronomers Arno Penzias and Robert Wilson were troubled by a persistent, low-frequency hum emanating from their Holmdel horn antenna. Seeking to isolate the source of this background noise, they systematically dismantled and cleaned the equipment, even going so far as to scrub away what they dryly referred to as a "white dielectric material" left by nesting pigeons. Despite these meticulous efforts, the static remained, [eventually leading to their realization that they had detected the cosmic microwave background radiation—the thermal echo of the Big Bang].

Question:

The writer wants to choose a concluding phrase for the sentence (replacing the underlined portion in brackets) that emphasizes the contrast between the mundane, domestic nature of the troubleshooting tasks and the vast, cosmic scale of their discovery. Given that all the choices are true, which one best accomplishes this goal?

The Light Fantastic

[1]
For decades, light-emitting diodes (LEDs) were familiar but limited fixtures of modern technology. Introduced in the 1960s, red and green LEDs quickly found their way into indicator lights, digital clocks, and calculator displays. However, one color remained conspicuously absent from the spectrum. To produce white light—which is essential for general household illumination—scientists needed to combine red, green, and blue light. While red and green were easily manufactured, the blue LED proved to be an elusive "holy grail" of semiconductor physics, frustrating researchers worldwide.

[2]
The primary challenge lay in finding a suitable semiconductor material. Most researchers focused on zinc selenide, which was easier to work with but yielded unstable, short-lived diodes. A few determined scientists, however, turned their attention to gallium nitride ($GaN$), despite widespread consensus that it was too difficult to grow in high-quality crystal form. In the late 1980s, researchers Isamu Akasaki and Hiroshi Amano at Nagoya University made a breakthrough by using a thin layer of aluminum nitride on a sapphire substrate to grow the elusive $GaN$ crystals. Soon after, Shuji Nakamura, working independently at a small chemical company, developed a novel thermal annealing process that vastly improved the material's electrical properties.

[3]
By 1993, Nakamura had demonstrated the first high-brightness blue LED, completing the trio of primary colors. By combining the blue LED with existing red and green ones, or by coating a blue LED with a yellow phosphor layer, engineers could finally produce bright, energy-efficient white light. Today, this technology powers everything from smartphone screens to streetlights, dramatically reducing global energy consumption and earning the inventors the 2014 Nobel Prize in Physics.

Suppose the writer's goal had been to write an essay that evaluates the specific physical mechanisms of semiconductor doping in gallium nitride crystals. Is the statement that the essay successfully achieves this goal true or false?

The Nitrogen Dilemma

[1]
In the early twentieth century, the world faced a looming Malthusian catastrophe. The natural deposits of sodium nitrate in Chile, the primary source of agricultural fertilizer, were rapidly depleting. Without a new source of nitrogen, global agriculture could not support the growing human population. The challenge was that atmospheric nitrogen ($N_2$), though abundant, is chemically inert and cannot be directly utilized by plants.

[2]
In 1909, German chemist Fritz Haber successfully demonstrated a high-pressure chemical reaction that synthesized ammonia ($NH_3$) directly from atmospheric nitrogen and hydrogen gas. Shortly thereafter, chemical engineer Carl Bosch scaled this laboratory breakthrough into an industrial process. By utilizing iron-based catalysts at extreme temperatures and pressures, the Haber-Bosch process allowed for the mass production of synthetic fertilizer, effectively lifting the ecological limit on crop yields and sustaining billions of lives.

[3]
However, this scientific triumph carried a dark legacy. The very same ammonia production facilities were quickly repurposed during World War I to manufacture nitric acid, a precursor for explosives. Haber himself actively pioneered the development of chemical weapons, leading to the deployment of chlorine gas on the battlefield. Thus, a process created to nourish humanity also facilitated unprecedented devastation, illustrating the profound ethical ambivalence of modern scientific advancement.

Suppose the writer's goal had been to write an essay that analyzes how a single scientific innovation can both avert a global humanitarian crisis and generate new forms of warfare. Would this essay fulfill that goal?

In the sentence below, a portion is underlined:

The museum's new digital archive is incredibly detailed; nevertheless, many visitors still prefer browsing the physical card catalog.

Which of the following choices best completes the underlined portion of the sentence grammatically?

The architect Antoni Gaudí designed several whimsical buildings in Spain. The historic cathedral, which is located in Barcelona, remains unfinished today. Despite this, it attracts millions of visitors every year.

Which choice best punctuates the underlined portion of the sentence?

Passage Excerpt:

In 1931, engineering draftsman Harry Beck designed a new map for the London Underground. Rather than drawing the routes to geographic scale, Beck created a diagrammatic layout that resembled an electrical circuit, prioritizing readability over physical distance.

Which choice provides the most direct and specific explanation of how Beck's map design benefited passengers?

The following sentences are from a draft of an essay about dendrochronology. To ensure that the paragraph logically builds its claim that tree-ring dating is a highly precise historical tool, in what order should the sentences be placed?

Deep-sea explorers diving near the Mariana Trench discovered a bizarre survival strategy employed by the telescope octopus: it spends its entire life floating vertically to minimize its silhouette against the faint sunlight from above.

Which choice best punctuates the underlined portion of the sentence?

Although the two marine biologists documented the migration pattern, the biologists' primary focus was its deviations from previous years.

Which choice best completes the underlined portion of the sentence?

When Mount Vesuvius erupted in 79 CE, it buried the Roman town of Herculaneum under volcanic ash, carbonizing hundreds of papyrus scrolls in a lavish villa. For centuries, these scrolls remained unreadable, reduced to fragile lumps of carbon that crumbled at the slightest touch. Recently, however, scientists have begun using advanced X-ray imaging techniques to read the scrolls without unrolling them. By detecting the tiny differences in how X-rays pass through the charred papyrus versus the ancient ink, researchers can reconstruct the writing three-dimensionally. [1]

Which of the following concluding sentences, if added at [1], would best support the paragraph's main focus on the role of modern technology in uncovering historical texts?

While exploring the depths of the Mariana Trench, the oceanographers observed several rare, bioluminescent fish species, and they documented the organisms' behavioral patterns.

Which choice best punctuates the underlined portion of the sentence?