Tüm alıştırma soruları

Urban ecologists studying the behavior of songbirds in metropolitan areas have noted that some species, such as the great tit (*Parus major*), sing at higher frequencies in noisy environments than their rural counterparts do. This acoustic shift is widely assumed to be a direct, real-time adaptation to prevent songs from being masked by low-frequency traffic rumble. However, biologist Kenji Sato and his team discovered that great tits inhabiting quiet city parks also sing at higher frequencies than rural birds, despite facing minimal traffic noise. This finding suggests that the frequency shift may not be a simple response to immediate acoustic interference. Instead, the behavior might be a genetically fixed trait or linked to other urban factors, such as architectural barriers that affect sound propagation.

Which choice best describes the function of the underlined sentence in the text as a whole?

In cognitive neuroscience, the mapping of neural pathways involved in semantic processing ______ significantly to our understanding of language acquisition. By observing how these pathways activate during communication tasks, researchers can pinpoint the precise regions of the brain that decode complex linguistic structures.

Which choice completes the text so that it conforms to the conventions of Standard English?

In the $xy$-plane, triangle $ABC$ is similar to triangle $DEF$, where vertices $A$, $B$, and $C$ correspond to vertices $D$, $E$, and $F$, respectively. The vertices of triangle $ABC$ are $A(0, 0)$, $B(6, 0)$, and $C(0, 8)$. The vertices of triangle $DEF$ are $D(2, 1)$, $E(11, 1)$, and $F(2, y)$, where $y > 1$. What is the value of $y$?

A rotating beacon rotates at a constant rate of $160^\circ$ per second. Through how many radians does the beacon rotate in $4.5$ seconds?

A solar energy storage system collects electricity from two solar panel arrays, Array $X$ and Array $Y$. Array $X$ produces $3$ kilowatt-hours (kWh) of electricity for every $4$ hours of direct sunlight. Array $Y$ produces $5$ kWh of electricity for every $6$ hours of direct sunlight. If both arrays receive direct sunlight simultaneously, how many hours of direct sunlight are required for the two arrays to produce a combined total of $38$ kWh of electricity?

A surveyor maps a triangular plot of land, $LMN$. A boundary line segment is drawn from point $P$ on side $LN$ to point $Q$ on side $LM$, creating a smaller triangular section $LPQ$. The measure of angle $LMN$ is equal to the measure of angle $LPQ$. The surveyed lengths are $LM = 18$ meters, $LP = 8$ meters, and $LQ = 12$ meters. What is the length, in meters, of segment $PN$?

A pendulum swings through an angle of $40^\circ$, and the tip of the pendulum travels an arc of length $8\pi$ inches. What is the length of the pendulum, in inches?

The analysis of fossilized leaves of the deciduous tree *Ginkgo biloba* from the Cretaceous-Paleogene transition reveals a sharp decrease in stomatal density—the number of pores per unit of leaf area. Because modern *Ginkgo* trees respond to elevated atmospheric carbon dioxide ($CO_2$) concentrations by reducing their stomatal density to conserve water, some researchers conclude that global $CO_2$ levels rose significantly during this period. However, skeptics suggest that this reduction was merely a localized adaptation to regional soil moisture levels in the specific basins where the fossils were deposited. This skeptical view is undermined, however, by the discovery of fossilized *Ginkgo* leaves from geographically isolated regions of the same era that also show uniform stomatal reduction, which suggests that

Which choice most logically completes the text?

In right triangle $XYZ$, the measure of angle $XYZ$ is $90^\circ$. Altitude $YW$ is drawn to hypotenuse $XZ$, dividing the triangle into two smaller triangles, $\triangle XYW$ and $\triangle YZW$. If the area of $\triangle XYW$ is $9$ and the area of $\triangle YZW$ is $36$, what is the length of altitude $YW$?

In right triangle $ABC$, the measure of angle $C$ is $90^\circ$. A point $D$ lies on side $AC$ such that $BD$ is the angle bisector of angle $ABC$. If $BC = 28$ and $BD = 35$, what is the length of segment $AD$?

A student is preparing a presentation on the history of superconductivity and has taken the following notes:

* In $1911$, Dutch physicist Heike Kamerlingh Onnes discovered superconductivity.
* Superconductivity is the complete absence of electrical resistance in certain materials.
* Onnes first observed this phenomenon while cooling solid mercury to a temperature of $4.2$ Kelvin.
* For his pioneering low-temperature research, Onnes was awarded the Nobel Prize in Physics in $1913$.

The student wants to write a sentence that emphasizes the year superconductivity was discovered and the temperature at which it was first observed. Complete the student's statement by filling in the blanks.

A sector of a circle with center $O$ has an area of $54\pi$. The perimeter of the sector is $36 + 6\pi$. If the radius of the circle is an integer, what is the radius of the circle?

In the early modern era, the rapid proliferation of printing technology did not simply accelerate the spread of ideas; it also had a profound standardizing effect on regional dialects. Before the printing press, local vernaculars varied widely over short distances. However, the commercial necessity of printing books for a broad market forced publishers to adopt more uniform spelling and grammatical conventions. Consequently, this market-driven standardization gradually ______ the previously diverse linguistic landscape, establishing dominant national languages at the expense of regional variations.

Which choice completes the text with the most logical and precise word or phrase?

While preparing a presentation on Viking exploration in North America, a student took the following notes:
- L'Anse aux Meadows is an archaeological site located in Newfoundland, Canada.
- In 1960, Norwegian explorer Helge Ingstad and archaeologist Anne Stine Ingstad discovered the site.
- The site contains the remains of eight timber-framed sod buildings constructed by Norse settlers.
- Radiocarbon dating suggests the Norse settlement was occupied around 1000 CE.
- UNESCO designated L'Anse aux Meadows a World Heritage site in 1978.

The student wants to emphasize the year of the site's discovery and the names of its discoverers. Which choice most effectively uses information from the given notes to accomplish this goal?

In deep-sea marine biology, the migration of bioluminescent organisms living near hydrothermal vents ______ a crucial role in nutrient distribution across oceanic layers. By tracking these vertical movements, researchers have gathered extensive data indicating that these biological processes help sustain complex ecosystems in the otherwise nutrient-poor bathypelagic zone.

Which choice completes the text so that it conforms to the conventions of Standard English?

In the $xy$-plane, the graph of the equation $x^2 + y^2 - 14x - 12y + q = 0$ is a circle that is tangent to the $y$-axis, where $q$ is a constant. What is the value of $q$?

In the nutrient-poor soils of temperate forests, many orchid species depend on mycorrhizal fungi to initiate seed germination. While researchers have long established that these symbiotic relationships are essential during the early stages of orchid development, botanical models have traditionally assumed that mature orchids become fully autotrophic, no longer relying on their fungal hosts for carbon. However, a recent study by Dr. Charles Albright revealed that several adult orchid species continue to receive significant amounts of carbon from mycorrhizal networks, particularly during periods of intense shade. This finding suggests that mycoheterotrophy may play a far more persistent role in orchid survival than previously believed, prompting researchers to reevaluate the ecological significance of belowground fungal networks in forest ecosystems.

Which choice best describes the function of the underlined sentence in the text as a whole?

A digital designer is scaling two similar triangular logos. The smaller logo has a perimeter of $18$ centimeters and an area of $12$ square centimeters. If the larger logo has a perimeter of $54$ centimeters, what is the area, in square centimeters, of the larger logo?