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“Obdurate” signifies stubbornly refusing to change one’s course or opinion. In the context of negotiations, an “obdurate” chair blocks concession or movement, aligning with “uncompromising” (B). “Compliant” (A) means yielding or agreeable, the opposite of the scenario described. “Distracted” (C) misreads the situation: attention lapses are different from deliberate rigidity. “Skeptical” (D) indicates doubt rather than refusal; one can be skeptical yet flexible. Nelson–Denny vocabulary items often hinge on pragmatic frames: in bargaining, a lack of progress is consistent with rigid posture. Recognize near-synonyms with similar connotations (obdurate, intransigent, adamant, unyielding) and contrast them with words describing willingness (amenable, compliant). A quick check via paraphrase—“the chair remained uncompromising”—retains the sentence’s meaning and causal implications (why talks stalled). The ability to map emotional tone (inflexible vs. flexible) to negotiation outcomes accelerates elimination of attractive but inaccurate distractors.

The paragraph proceeds stepwise: it introduces a method (apps + expert review + model), identifies a limitation (accuracy drops with highway noise), then describes a refinement (noise profiles raise performance), and ends with practical recommendations (mic placement, wind shields). That sequencing is classic method–limitation–refinement–guidance, matching B. C would profile a person; absent. D would define terms and classify them; not the case. A would tack on an unrelated ending; here, each step logically leads to the next. On Nelson–Denny structure questions, look for the middle sentence that flags a constraint (“lowest near highways”)—a pivot around which the refinement turns. The final operational advice signals an applied orientation, common in science-and-citizen-science passages that move from innovation to field practice. Selecting the label that captures this pipeline from problem identification to improved procedure mirrors the author’s intent and guards against distractors that mischaracterize a clearly methodological narrative.

“Impecunious” describes having little or no money; it derives from Latin roots meaning “without cattle/money,” historically a stand-in for wealth. Within the sentence, the concessive cue “Despite his brilliance” contrasts intellectual success with financial scarcity during graduate school, making “destitute” (C) the best match. Choice A, “affluent,” is the direct opposite and contradicts the struggle implied. Choice B, “indebted,” focuses on owing money; someone can be impecunious without carrying formal debt. Choice D, “extravagant,” concerns spending style rather than income or assets and could apply even to wealthy people. Nelson–Denny vocabulary items often hinge on recognizing register and collocations: “impecunious student/artist/scholar” is a common pairing in expository prose. A fast strategy is the substitution test: “the young researcher was destitute” preserves the sentence’s logic and tone. Build semantic clusters to accelerate recognition under time constraints: impecunious, penurious, indigent ↔ affluent, opulent, prosperous. Distinguishing “impecunious” (lack of funds) from “parsimonious/miserly” (unwilling to spend) protects against traps that swap ability to spend with willingness to spend—two different ideas the test likes to contrast.

The concern is that habitual sweetener exposure recalibrates taste toward “very sweet,” leading to higher sweet-item consumption. To strengthen this, we need longitudinal evidence linking exposure to both shifting taste ratings and purchasing behavior, with appropriate controls. Option B provides exactly that: over a year, heavy users grow less fond of unsweetened foods and buy more sweet snacks than matched nonusers—directly connecting exposure, palate change, and behavior. Option A is irrelevant; discrimination between sweeteners doesn’t address palate calibration or consumption. Option C is too general and lacks a causal link. Option D lacks temporal depth and controls, making it impossible to infer change or causation. On Nelson–Denny strengthen tasks, identify the hypothesized pathway (exposure → taste preference shift → behavior) and select evidence that tracks the pathway over time with a comparison group, thereby supporting the policy-relevant implication.

“Puerile” means childishly silly, juvenile, or lacking in mature judgment. The sentence’s cue—“raise the level of argument”—frames the criticism as one about maturity and seriousness, not bravery (courageous), novelty (innovative), or obscurity (arcane). Thus, “childish” (A) is the precise match. In the Nelson–Denny context, tone words like puerile often appear in opinion writing to signal an author’s evaluation of reasoning quality. Recognize nearby discourse markers (“dismissed,” “urging colleagues”) that indicate a negative appraisal and help you eliminate choices that carry positive or neutral valence. Keep close contrasts straight: “puerile” vs. “precocious” (advanced for age), and “puerile” vs. “pedantic” (overly concerned with minor rules). A quick substitution test—“dismissed the proposal as childish”—preserves both meaning and rhetorical force. Building clusters around maturity—puerile/juvenile ↔ sober/judicious—improves speed. Finally, note that authors sometimes use “puerile” hyperbolically to discredit an idea without engaging its substance; spotting this can also prime you to anticipate a question about argumentative fallacies or tone elsewhere in a passage.