SAT Reading & Writing: Hard Rhetorical Synthesis (Drill 26)

Question 1. The student wants to explain how adding plant-ash flux made glass possible for early furnaces. Which choice most effectively uses relevant information from the notes to accomplish this goal?

• A) Lime, a third ingredient added to the silica-and-flux batch, restores the cooled glass to a stable, water-resistant solid that no longer slowly dissolves or clouds over with age.
• B) Burning coastal plants for their ash gave glassmakers a flux that lowered the temperature needed to melt the silica-rich batch from about 1700 degrees Celsius to roughly 1000, within reach of early furnaces. ✓
• C) Pure silica sand, the main glassmaking ingredient, does not soften or melt at all until it is heated to roughly 1700 degrees Celsius, far hotter than the early furnaces of that period could ever hope to reach.
• D) Early glassmakers obtained the soda or potash they used as flux by burning coastal or marine plants over a fire and carefully collecting the alkali-rich ash those plants left behind.

Explanation: Choice B is the best answer. The sentence names the ash-derived flux and ties it to the lowered temperature needed to melt the silica-rich batch, which brought glassmaking within reach of early furnaces, explaining the process the goal asks about. Choice A points to the lime that stabilizes the glass, a later step rather than how the flux made melting possible. Choice C restates the high temperature needed to melt pure silica, the obstacle rather than the flux's solution to it. Choice D points to the source of the flux, where it came from rather than how it lowered the temperature needed to melt the batch.

Question 2. The student wants to define what a camera obscura is for readers who have never heard the term. Which choice most effectively uses relevant information from the notes to accomplish this goal?

• A) From the sixteenth century onward, artists fitted a lens into the opening of the box and traced the projected scene by hand, using the whole device as a practical aid to their drawing.
• B) A smaller hole yields a sharper but dimmer image, while a wider hole yields a brighter but blurrier one.
• C) A sunlit scene outside the chamber lands right side up on the facing surface after its own light has traveled in straight lines through the small hole.
• D) A camera obscura is a dark room or box admitting light through a small hole, casting an upside-down image of the outside scene onto the facing wall. ✓

Explanation: Choice D is the best answer. The sentence gives the defining features, a dark chamber with a small hole that projects the outside scene inverted onto the facing wall, which is what the goal asks for. Choice A reports how artists later used the device, a function rather than a definition of the term. Choice B notes how hole size trades sharpness against brightness, a detail rather than the core definition. Choice C says the projected scene appears right side up, which reverses the inversion the notes describe.

Question 3. The student wants to present the study's main finding about how monarchs hold their course. Which choice most effectively uses relevant information from the notes to accomplish this goal?

• A) Each fall, monarch butterflies travel as far as 2,000 miles south to reach a small set of overwintering sites.
• B) The butterflies' magnetic compass responds only to ultraviolet and blue light within a narrow band of wavelengths.
• C) The study found that monarchs steer mainly by a sun compass that depends on clocks in their antennae, falling back on an antennal magnetic compass when clouds hide the sun. ✓
• D) The study found that the monarchs' two compasses together identify the overwintering grove itself and steer each butterfly the whole way to that one final endpoint.

Explanation: Choice C is the best answer. The sentence reports the study's central result, a primary sun compass backed up by a magnetic one when clouds hide the sun, which is the finding the goal calls for. Choice A recounts the distance and destination of the migration, context rather than the steering finding. Choice B isolates the wavelength sensitivity of the magnetic compass, a narrow detail rather than the main result. Choice D claims the compasses locate the endpoint, contradicting the notes' point that they only hold a direction.

Question 4. The student wants to introduce vegetable tanning and explain how its tannins preserve the hide. Which choice most effectively uses relevant information from the notes to accomplish this goal?

• A) Vegetable tanning preserves hide by steeping it in plant tannins, which cross-link the collagen fibers and force out water so the protein resists rot. ✓
• B) Vegetable tanning is a method of turning raw animal hide into leather that lasts.
• C) Chrome tanning, a faster modern alternative, relies instead on chromium salts rather than plant tannins and finishes a hide in a matter of hours rather than months.
• D) The hide is steeped in pits of progressively stronger tannin solution, a soak that can last for months.

Explanation: Choice A is the best answer. The sentence introduces the method and explains the tannin cross-linking that drives out water and resists rot, meeting both parts of the goal. Choice B names the method but stops short of explaining how it preserves the hide. Choice C describes chrome tanning, a different process than the one the goal names. Choice D reports the length of the soak, a single step rather than the preserving mechanism.

Question 5. The student wants to convey what the screw was designed to accomplish. Which choice most effectively uses relevant information from the notes to accomplish this goal?

• A) Gravity holds each trapped pocket at the low point of its turn while the rotation carries that low point upward.
• B) The Archimedes screw was built to lift water from a low source up to a higher level by turning a slanted helix. ✓
• C) The Archimedes screw is a long helical blade wound tightly around a central shaft and enclosed inside a close-fitting tube, the whole assembly set at a slant.
• D) Run in reverse, with water poured in at the top, the same screw lets the falling water spin the blade and so drive an attached generator.

Explanation: Choice B is the best answer. The sentence states the purpose the device was built for, raising water from a low source to a higher level, which is the aim the goal asks for. Choice A explains how the pockets climb, the mechanism rather than the intended purpose. Choice C lists the screw's parts, a description rather than its aim. Choice D notes a reversed use as a turbine, a later application rather than the original design aim.