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The sentence contrasts two qualities: the arguments were occasionally flawed but “ultimately persuaded … with clarity and logical structure.” The blank must acknowledge a weakness without contradicting the overall persuasiveness. “Rambling” means lengthy and digressive, which fits “at times” but does not negate eventual clarity. “Cogent,” “trenchant,” and “lucid” all indicate strong clarity, which would make the contrast nonsensical. Thus “rambling” is correct. On GRE completion, look for the contrast markers—here, “though … ultimately”—to ensure the word fills a subordinate concession while preserving coherence. Always test by paraphrasing: “though rambling at times, ultimately persuasive with clarity.” That maintains logical consistency.

Clues point to clarity and precision: the outcome “hinged on a technical definition,” and the attorney eschewed rhetoric to use “precise statutory language.” The blank should reflect exceptional clearness. “Pellucid” means transparently clear, fitting perfectly. “Grandiloquent” suggests pompous or bombastic speech—the opposite of the restrained precision described. “Histrionic” relates to overly dramatic behavior, again at odds with the tone. “Mercurial” means unpredictable or volatile, irrelevant to clarity. On GRE completion items, align the blank with multiple reinforcing cues. Here, the context favors lucidity and precision; “pellucid” is a high-frequency GRE synonym for very clear exposition. A quick paraphrase confirms coherence: “admirably pellucid” matches “avoiding rhetoric” and focusing on definitions. Eliminating options with mismatched tone prevents attractive but incorrect choices. Always use the sentence’s purpose clause (“in favor of precise statutory language”) as the anchor for meaning.

The contrast is between initial dismissal and later confirmation. The blank must capture a negative early judgment. “Spurious” means false or not genuine—fits perfectly. “Plausible,” “rigorous,” and “cogent” are positive descriptors inconsistent with dismissal. GRE completion often uses reversal signals like “but” to demand opposite tones across clauses. Plugging in: “initially dismissed as spurious, but … confirmed accuracy” is logically consistent.

The sentence concedes ambition but notes criticism for ignoring practical limits. The blank must denote impractical idealism. “Quixotic,” meaning exceedingly idealistic or unrealistic, fits exactly. “Visionary” can be positive without impracticality, but the context emphasizes criticism. “Pragmatic” and “judicious” both connote practicality, contradicting “overlooking constraints.” On GRE completions, key words like “criticized” and “overlooking” point clearly toward a negative, impractical descriptor. Plugging in “quixotic” yields: “criticized as quixotic, overlooking practical constraints,” which is coherent.

The passage explicitly notes wide divergence in forecasts and urges a pivot in policy focus “from predicting exact totals” to “building adaptable systems.” That is a recommendation framed by uncertainty, which matches option C. Option A contradicts the balanced statement about divergence. Option B suggests confidence in precise predictions after model improvement, which the passage does not endorse; it emphasizes uncertainty as a reason to deprioritize prediction. Option D hinges on a false trade-off; the text advocates both portable benefits and retraining (as elements of adaptability), not one instead of the other. On GRE RC, look for imperative verbs (“should shift”) and lists of prescriptions—they typically reveal the author’s purpose.