Topic Development

The following passage is an excerpt from an essay about deep-sea exploration.

In 1977, oceanographers aboard the research vessel *Alvin* descended into the Pacific Ocean near the Galápagos Islands, expecting to find nothing more than a barren, frozen seafloor. To their astonishment, they discovered hydrothermal vents—fissures in the Earth's crust spewing superheated, mineral-rich water. Surrounding these vents were thriving ecosystems teeming with giant tube worms, blind crabs, and ghost-white fish. This discovery revolutionized biology, showing that life could flourish in the complete absence of sunlight by relying on chemosynthesis, a process in which microbes convert toxic chemicals into energy. [1]

The writer wants to add a concluding sentence at point [1] that summarizes the main idea of the paragraph and reinforces the revolutionary impact of the discovery on scientific understanding. Which choice best accomplishes this goal?

In the mid-twentieth century, the modern conservation movement was revolutionized by the introduction of the wilderness concept. Proponents of this philosophy argued that certain natural areas should be set aside and completely protected from human development. This marked a significant departure from earlier conservation efforts, which had focused primarily on the sustainable extraction of resources like timber and minerals. The U.S. Congress formalized this new approach by passing the Wilderness Act of 1964, which legally defined wilderness as "an area where the earth and its community of life are untrammeled by man." Some early drafts of the legislation were composed on manual typewriters in crowded congressional offices. Today, this landmark act protects over one hundred million acres of public land, ensuring that these ecosystems remain undisturbed for future generations.

The writer is considering deleting the sentence "Some early drafts of the legislation were composed on manual typewriters in crowded congressional offices" from the paragraph. Should this sentence be deleted?

Passage Excerpt:

In the late nineteenth century, audio was captured on fragile, spinning wax cylinders. Over time, these cylinders have degraded, making them too delicate to be played by a physical stylus without destroying the recordings. To retrieve these sounds, scientists developed IRENE, a system that uses digital imaging. [Underlined: A camera captures high-resolution images of the grooves to create a 3D digital model, avoiding any physical contact.] This visual map is then translated by computer software back into audio, allowing archivists to preserve lost voices.

Question:

The writer wants to choose an option that most clearly explains the specific mechanism of the IRENE system while emphasizing how it protects the fragile cylinders from damage. Which choice best accomplishes this goal?

In 1857, French inventor Édouard-Léon Scott de Martinville patented the phonautograph, the earliest known device for recording sound. Unlike Thomas Edison's phonograph, which could both record and play back audio, Scott's invention was designed only to write sound waves onto soot-coated paper. Scott believed that these visual transcriptions, which he called "phonautograms," could eventually be read by eye. Consequently, because he never intended for his recordings to be heard, they remained silent, unplayed artifacts for over a century.

In 2008, scientists at the Lawrence Berkeley National Laboratory utilized digital scanning technology to examine Scott's surviving papers. By mapping the soot patterns and translating them into digital audio files, they successfully recovered the voice of a woman singing the French folk song "Au Clair de la Lune." [1]

The writer wants to add a sentence at [1] to conclude the passage by emphasizing the historic significance of Scott's invention. Which choice most effectively accomplishes this goal?

Termites are master builders, constructing towering mounds that can reach up to thirty feet in height on the African savanna. Despite the scorching daytime heat, the temperature inside these mounds remains remarkably stable. This thermal regulation is achieved through a complex network of vents and tunnels that facilitate passive ventilation. Warm air rises and escapes through a central chimney, while cooler air is drawn in at the base.

Which of the following sentences, if added at the end of the paragraph, would provide the most effective conclusion to the paragraph?

During the nineteenth century, the printing industry underwent rapid technological growth, demanding faster methods for producing newspapers and books. To speed up the typesetting process, workers cast commonly used phrases or words into single metal plates rather than composing them letter by letter. These cast plates were named after the clicking sound made during their creation: clichés. The term eventually transitioned from a technical printing word to a metaphor for overused expressions.

Which choice most effectively concludes the paragraph by reinforcing the relationship between the origin of the term 'cliché' and its current definition?

The sentences below are from a draft of an essay about Mesoamerican architecture. To ensure that the paragraph logically builds its claim that the pyramid produces a bird-like sound and explains how this effect is achieved, in what order should the sentences be placed?

Cellulose nitrate served as the primary base for motion picture film from the inception of cinema until the early 1950s, lauded for its luminous quality and high tensile strength. However, this compound is notoriously unstable: it is highly flammable, prone to spontaneous combustion under ambient conditions, and susceptible to auto-catalytic decay that reduces the film to an acidic, highly combustible powder. [1] __________________________________________________ Consequently, archives worldwide must house these fragile historical documents in specialized, sub-freezing vaults designed to suppress chemical degradation and mitigate fire hazards.

Which choice most effectively introduces the paragraph's discussion of the specialized storage and safety measures required to preserve cellulose nitrate film?

The following passage is an essay about Marie Tharp and ocean mapping.

[1]
For decades, the consensus among geologists was that the ocean floor was a flat, featureless plain. In the early 1950s, Marie Tharp, a geologist and cartographer at Columbia University, set out to challenge this assumption. Working with raw topographic data collected by her colleague Bruce Heezen, Tharp spent years drafting detailed profiles of the Atlantic Ocean floor. Because women were barred from working on research vessels at the time, Tharp relied entirely on Heezen's sonar data, painstakingly hand-drawing the underwater landscapes.

[2]
As Tharp plotted the data points, she noticed a distinct V-shaped valley running down the center of the Mid-Atlantic Ridge. She hypothesized that this feature was a rift valley, which would indicate that the ocean floor was spreading apart. This concept of continental drift was highly controversial and widely dismissed by the scientific community at the time. When Tharp first showed her findings to Heezen, he dismissed it as "girl talk." Undeterred, Tharp insisted on re-evaluating the data until Heezen was convinced, leading to their collaborative publication of the first physiographic map of the North Atlantic in 1957.

[3]
Tharp and Heezen's map revolutionized the field of earth science, providing visual evidence that supported the theory of plate tectonics. By showing that the ocean floor was dynamic and actively changing, their work transformed our understanding of how Earth's crust is formed and recycled. Today, Tharp is recognized not only for her monumental contributions to marine cartography but also as a pioneer who broke through the gender barriers of mid-century academia.

Suppose the writer's goal had been to write an essay that profiles the collaborative relationship between Marie Tharp and Bruce Heezen, emphasizing their shared academic backgrounds and mutual career development. Would this essay fulfill that goal?

In 1856, eighteen-year-old chemist William Henry Perkin was attempting to synthesize quinine, a treatment for malaria, in his home laboratory in London. Instead of obtaining a clear drug, Perkin ended up with a dark, sludge-like residue. When he attempted to clean the flask with alcohol, the mixture turned a brilliant purple. Recognizing the potential of the vibrant hue, Perkin realized he had accidentally created the first synthetic organic dye, which he eventually named mauveine.

Prior to Perkin’s discovery, dyes were derived exclusively from natural sources like plants, insects, and minerals. Purple, historically harvested from the glands of Mediterranean sea snails, was so rare and expensive that it was reserved almost entirely for royalty. Mauveine transformed this landscape. Because it could be mass-produced in a laboratory at a fraction of the cost, purple fabric suddenly became accessible to the general public. Perkin quickly patented his process, secured financial backing, and built a factory to manufacture the dye, sparking a fashion craze across Europe.

Perkin’s success did more than just revolutionize fashion; it laid the foundation for the modern chemical industry. The methods used to synthesize mauveine demonstrated that valuable organic compounds could be engineered systematically from coal tar, a waste product of coal gas production. This breakthrough prompted researchers to develop synthetic colors, artificial pharmaceuticals, and new plastics. By transforming chemistry from a descriptive science to a creative, industrial enterprise, Perkin’s accidental residue reshaped the modern world.

Suppose the writer’s goal had been to write an essay demonstrating how an accidental laboratory discovery influenced both nineteenth-century European fashion and the trajectory of industrial chemistry. The essay successfully achieves this goal.

[1] In 1910, French engineer Georges Claude introduced the neon lamp to the public at the Paris Motor Show, capitalizing on a byproduct of his air liquefaction business. [2] Claude had been searching for a way to utilize the abundant neon gas left over from producing pure oxygen for industrial applications. [3] He discovered that passing an electric current through the gas in a sealed glass tube produced a brilliant, luminous red light. [4] Under normal atmospheric conditions, neon is a colorless, odorless, and chemically inert monatomic gas. [5] Recognizing the advertising potential of his discovery, Claude soon sold the first commercial neon signs to a Parisian barber, launching a global industry that would permanently transform the nighttime aesthetics of modern cities.

The writer is considering deleting Sentence 4 from the paragraph. Should the sentence be kept or deleted?

In 1873, tailor Jacob Davis and merchant Levi Strauss patented a new type of durable work pants. These pants featured copper rivets at points of strain, such as pocket corners, to prevent tearing. The rivets were manufactured in a small factory located in Maryland. The sturdy trousers, later known as blue jeans, quickly became popular among miners who needed clothing that would not rip during hard labor.

The writer is considering deleting the underlined sentence from the passage. Should this sentence be deleted?

The following passage is an excerpt from an essay about ancient manuscripts.

In 1906, Danish philologist Johan Ludvig Heiberg examined a medieval prayer book in Istanbul and made a startling discovery: underneath the thirteenth-century religious texts lay much older, partially erased mathematical treatises by the ancient Greek mathematician Archimedes. This unique manuscript, known as the Archimedes Palimpsest, contained the only surviving copy of *The Method of Mechanical Theorems*, in which Archimedes anticipated modern calculus by using infinitesimals to calculate areas and volumes.

To read the faint, overwritten script, modern conservators utilized multispectral imaging, a technology that captures images under various wavelengths of light to expose the chemical differences between the two layers of ink. This non-invasive method successfully revealed lost pages of Archimedes's works alongside commentaries on Aristotle. [Underlined: Fortunately, the book was preserved through the centuries despite its poor condition.]

The writer wants to conclude the passage with a sentence that emphasizes the significance of the recovery of the Archimedes Palimpsest and summarizes the main themes of the passage. Which choice best accomplishes this goal?

Passage:
In the 1840s, British botanist Anna Atkins pioneered the use of photography for scientific illustration. Seeking a more accurate way to document botanical specimens than hand-drawn illustrations, Atkins turned to the newly invented cyanotype process. This method involved placing specimens directly onto chemically treated paper and exposing them to sunlight. The resulting images were highly detailed, [offering a level of precision that traditional drawings could not match].

Question:
The writer wants to revise the underlined portion (bracketed in bold above) to provide the most specific, concrete visual details that illustrate the appearance of the cyanotype images. Which choice best accomplishes this goal?

The following passage is an excerpt from an essay about digital audio preservation.

In the late 1990s, physicist Carl Haber attended a lecture detailing the inevitable decay of historical audio media. Intrigued by the challenge of preserving fragile wax cylinders and shellac discs, Haber realized that the same optical scanning techniques used in subatomic particle physics could be applied to sound. This insight led to the development of IRENE, a non-contact system that uses high-resolution cameras to capture 3D digital images of a record's physical grooves. Specialized software then translates these visual maps back into audio files, completely bypassing the need for a physical needle. By avoiding physical contact with the fragile media, researchers have successfully reconstructed audio from severely damaged cylinders that were once considered unplayable.

The writer wants to conclude the paragraph with a sentence that emphasizes how IRENE's optical technology has rescued historical recordings that were previously thought to be permanently lost. Which choice best accomplishes this goal?

In 1938, Ruth Wakefield, co-owner of the Toll House Inn in Massachusetts, made a culinary discovery that would change American dessert history. While preparing a batch of chocolate desserts, she chopped up a bar of semi-sweet chocolate and added the pieces to her cookie dough, expecting them to melt and create chocolate cookies. Instead, the chocolate bits retained their shape, resulting in the very first chocolate chip cookies.

The writer wants to add a concluding sentence to the paragraph that wraps up the main point of the passage and emphasizes the lasting impact of Wakefield's accidental invention. Which of the following sentences best accomplishes this goal?

The following passage is an essay about early sound recording technology.

[1]
In 1857, French inventor Édouard-Léon Scott de Martinville patented the phonautograph, a device designed to visually record sound waves onto paper blackened by the soot of a plasterer’s lamp. As a speaker sang or spoke into a horn, a membrane vibrated, causing a stylus to etch wavy lines onto the rotating paper cylinder. Unlike Thomas Edison’s phonograph, which would emerge two decades later, Scott’s invention was not designed to play sound back. Instead, Scott believed that humans could learn to "read" the visual squiggles of the phonautograms just as one reads text. Consequently, these earliest recordings of the human voice remained silent, locked in archival sheets for over a century.

[2]
The silence was finally broken in 2008 when an international team of scientists and historians collaborated to play back Scott's recordings. Using high-resolution digital scans of the paper phonautograms, researchers at the Lawrence Berkeley National Laboratory employed a virtual stylus to trace the etched lines. By converting these physical undulations into digital audio, they successfully reconstructed the sound of a human voice singing a snippet of the French folk song "Au Clair de la Lune." The recording, dated April 9, 1860, is widely recognized as the oldest known recording of a human voice, predating Edison’s first acoustic playback by seventeen years.

[3]
Beyond their historical novelty, these restored phonautograms have fundamentally altered our understanding of early acoustic technology. They demonstrate that the desire to capture sound existed long before the technology to play it back was developed. Furthermore, the recovery process highlighted the power of modern optical imaging to preserve fragile historical media. Today, archivists continue to apply these digital techniques to retrieve lost sounds from wax cylinders and shellac discs, ensuring that the ephemeral voices of the past can be heard by future generations.

Suppose the writer’s goal had been to write an essay demonstrating that Thomas Edison's phonograph was directly inspired by Édouard-Léon Scott de Martinville's phonautograph. Is the statement that the essay successfully achieves this goal true or false?

Hilma af Klint

[1] __________________________________________________ Long before Vasily Kandinsky, Piet Mondrian, and Kazimir Malevich were credited with pioneering abstract art, the Swedish artist had quietly created a massive body of non-representational paintings. Influenced by spiritualism and the natural world, af Klint believed the world was not ready for her visionary art, which featured vibrant geometric shapes and biomorphic forms. Consequently, she stipulated in her will that her paintings must not be displayed to the public until twenty years after her death.

Which choice most effectively introduces the paragraph and establishes the central subject of the passage?

[1] The Eiffel Tower, constructed for the 1889 World's Fair in Paris, was originally intended to be a temporary structure dismantled after twenty years. [2] Many Parisians initially disliked the tower's bold iron lattice structure, calling it an eyesore. [3] Gustave Eiffel, the chief engineer, had previously designed the internal framework for the Statue of Liberty. [4] However, the tower was saved from demolition when its tall antenna proved to be highly valuable for wireless telegraphy.

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

Passage Excerpt:
Constructed in 1932, the Harlem YMCA on 135th Street was more than a residential facility; it was a sanctuary for African American artists and intellectuals who were barred from segregated hotels. [Sentence X] Local residents frequented its library and exhibition spaces, fostering a vibrant intellectual community.

The writer wants to add a sentence at the position of [Sentence X] that provides a vivid description of the building's physical appearance and emphasizes its visual contrast with the surrounding neighborhood. Given that all the choices are true, which choice best accomplishes this goal?