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Difficulty: Very hardSummary: Identifying Central Arguments and Key Points

Read the passage below carefully and answer the question that follows.

Across the Sahelian belt of West Africa, traditional earth architecture—exemplified by the historic earthen structures of Djenné—has long offered exceptional thermal regulation in extreme climates. However, mid-twentieth-century urban expansion precipitated a widespread transition toward imported Portland cement and corrugated iron roofing, which were widely viewed as symbols of modernity and social prestige. While concrete structures promised structural longevity, their high thermal mass absorbs and retains intense heat, necessitating energy-intensive artificial cooling solutions that overburden municipal electrical grids and amplify urban heat islands. In response to mounting energy costs and climate vulnerability, contemporary African architects are pioneering a movement that hybridizes vernacular earth construction with modern structural engineering. By stabilizing local soil into compressed earth blocks (SCEBs) and incorporating passive bio-climatic design features—such as oriented cross-ventilation, deep shading eaves, and thermal buffer zones—they are creating affordable, high-performance buildings tailored to tropical and arid zones. Nevertheless, widespread scale-up remains hampered by outdated municipal building codes that categorize unbaked earth as temporary or substandard material, alongside credit frameworks that privilege capital-intensive industrial inputs. Reclaiming and modernizing vernacular building techniques is therefore not a nostalgic retreat, but a vital structural imperative for achieving climate resilience and equitable housing in expanding African cities.

Which of the following statements best captures the central argument of the passage?

  1. A
    The rapid expansion of West African cities mandates an immediate prohibition on imported Portland cement in favor of unbaked clay structures.
  2. Modernizing traditional earth architecture offers an essential pathway for sustainable African urban housing, though regulatory and financial hurdles limit its adoption.Answer
  3. C
    Concrete structures in Sahelian cities overburden municipal electrical grids because of their high thermal mass and reliance on artificial cooling.
  4. D
    Vernacular earth architecture was historically abandoned throughout the Sahel primarily because unbaked soil failed to meet structural safety standards.

Answer

Modernizing traditional earth architecture offers an essential pathway for sustainable African urban housing, though regulatory and financial hurdles limit its adoption.
The correct answer accurately synthesizes the passage's primary claim: that integrating modernized vernacular earth construction with contemporary engineering provides a sustainable, climate-resilient urban housing solution, while acknowledging the regulatory and financial barriers preventing widespread implementation.

Step-by-Step Solution

1
Analyze the passage structure to distinguish core arguments from supporting context.
The passage outlines the historical reliance on thermal earth building, the drawbacks of cement adoption, the modern synthesis of earth blocks with engineering, and the systemic barriers to scaling this solution.
Identifying paragraph functions clarifies the author's primary purpose.
2
Evaluate the author's concluding emphasis and overall thesis.
The author concludes that modernizing vernacular architecture is a structural imperative for climate resilience and equitable housing, despite institutional obstacles.
The central argument encompasses both the proposed solution (modernized earth architecture) and its operational context (institutional constraints).
3
Compare option choices against the synthesized main idea.
The statement highlighting modernized earth architecture as a vital pathway constrained by regulatory hurdles completely captures the passage's primary focus without oversimplifying or selecting minor details.
Distractors focus either on single supporting facts, exaggerated claims, or historical misinterpretations.

Key Concept

Identifying the central argument in a comprehensive summary passage
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Topics

Summary: Identifying Central Arguments and Key Points

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