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Question

Difficulty: HardMulti-Blank Dependency Tracking

Complete the passage by filling in each blank with the word that best fits the logical context of the text.

Answer:While early evolutionary biologists posited that adaptive radiation occurs in 【paroxysmal】 bursts following mass extinction events, subsequent fossil evidence reveals a far more 【protracted】 transition; ecological niches were not filled immediately by explosive speciation, but rather through an extended period of subtle shifts that 【belied】 the simplistic narrative of sudden diversification.

Answer

Blank 1: paroxysmal; Blank 2: protracted; Blank 3: belied
The sentence relies on a contrast signaled by 'While' and refined by the elaboration following the semicolon. The early view characterized adaptive radiation as occurring in violent, sudden bursts ('paroxysmal'), whereas the fossil record demonstrates a drawn-out, gradual shift ('protracted'). Consequently, these empirical findings exposed the simplistic narrative of sudden diversification as false ('belied').

Step-by-Step Solution

1
Analyze structural contrast signals in the sentence
The initial concession word 'While' indicates a direct contrast between the early hypothesis held by evolutionary biologists and the 'subsequent fossil evidence'.
Tracking structural contrast signals establishes the opposing relationship between the early view and the new findings.
2
Determine the semantic orientation using elaboration clues after the semicolon
The clause following the semicolon explains that niches were filled through an 'extended period of subtle shifts' rather than 'explosive speciation'.
This contextual clue defines Blank 2 as describing a drawn-out process ('protracted') and reveals that the early view in Blank 1 must describe violent or sudden bursts ('paroxysmal').
3
Evaluate Blank 3 based on the relationship between the fossil evidence and the early narrative
Because the fossil evidence demonstrates an extended, subtle process, it contradicts or disproves ('belied') the simplistic narrative of sudden diversification.
Blank 3 requires a verb that reflects how nuanced empirical findings undermine an oversimplified theory.

Key Concept

Multi-Blank Dependency Tracking: Utilizing structural signals and downstream elaboration to simultaneously align interdependent sentence blanks.
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Multi-Blank Dependency Tracking

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