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Question

Difficulty: MediumIdentifying Main Ideas and Supporting Details

An environmental feature discusses climate adaptation strategies in southern Spain:

"In the rugged highlands of Andalusia’s Sierra Nevada, hydrologists and agrarian communities are collaborating to rehabilitate medieval acequias de careo—unlined stone and earthen channels constructed during the Islamic period to deliberately slow snowmelt runoff. Rather than channeling springtime meltwater directly into river valleys, these historical gravity-fed canals divert runoff across porous schist slopes, intentionally allowing water to infiltrate mountain aquifers. This subterranean storage acts as a natural sponge, releasing water months later during the arid summer into lower agricultural valleys where family-run olive and almond groves face escalating climate-driven water scarcity. Field data confirms that this decentralized hydrological restoration enhances late-season streamflow by nearly forty percent compared to unmanaged catchments, offering a low-cost, ecological countermeasure to prolonged regional droughts. Furthermore, the communal governance framework required to maintain these ditches has revitalized local water user syndicates, demonstrating that historical hydraulic heritage combined with contemporary hydrological monitoring provides a viable alternative to capital-intensive concrete reservoirs."

Which of the following best expresses the central thesis of the essay?

  1. A
    Restoring medieval earthen canals increases late-season streamflow by approximately forty percent in managed mountain catchments.
  2. B
    Traditional gravity-fed canal systems will render modern concrete reservoirs completely obsolete across all Mediterranean agricultural sectors.
  3. Revitalizing traditional mountain infiltration channels offers a sustainable, community-supported solution for regional water security during prolonged droughts.Answer
  4. D
    Agrarian syndicates prefer medieval communal governance primarily because modern computerized reservoir management is inherently flawed and unethical.

Answer

Revitalizing traditional mountain infiltration channels offers a sustainable, community-supported solution for regional water security during prolonged droughts.
The correct answer accurately synthesizes the main thesis of the passage: rehabilitating historical earthen channels (acequias de careo) provides a low-cost, ecological, and socially cohesive method to mitigate seasonal drought and recharge aquifers. The passage introduces this practice, explains its physical mechanism, and concludes that pairing traditional heritage with hydrological science offers a sustainable alternative to capital-intensive infrastructure.

Step-by-Step Solution

1
Identify the primary topic and scope of the passage
The text focuses on reviving traditional Sierra Nevada infiltration channels (acequias de careo) to recharge mountain aquifers and sustain downstream agriculture during dry periods.
Understanding the central focus establishes the baseline needed to distinguish the overarching thesis from individual supporting facts.
2
Analyze how supporting details reinforce the overarching argument
The hydrological infiltration process, the forty percent streamflow increase, and the revitalization of local syndicates serve as evidence proving the viability of this nature-based water management method.
Evaluating why specific pieces of evidence are cited helps separate individual data points from the central claim.
3
Select the statement that captures the comprehensive thesis rather than isolated metrics or unsupported generalizations
The statement highlighting that revitalizing traditional infiltration channels provides a sustainable, community-supported solution for drought resilience accurately reflects the core thesis.
The central thesis must encompass both the environmental efficacy and the communal value emphasized across the entire article.

Key Concept

Distinguishing between a text's overarching main idea and its supporting empirical details or isolated claims
Estimated Time:1m 30s
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Topics

Identifying Main Ideas and Supporting Details

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