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Zorluk: OrtaInferring Author Purpose and Intent

Before chemical treatment systems became widespread, municipal water utilities relied primarily on slow sand filtration to purify drinking water. Unlike rapid filters that depend on chemical flocculants to trap suspended debris mechanically, slow sand filters cultivate a dense biological layer known as the schmutzdecke on the sand's surface. This living matrix of algae, protozoa, and harmless bacteria actively digests pathogenic microorganisms as water percolates downward. Although slow sand filters require substantial land area and periodic manual scraping of the top layer, their ability to deliver high-grade biological purification without complex electrical or chemical infrastructure makes them invaluable in rural and decentralized settings.

Based on the passage, the author's primary purpose is to:

  1. A
    criticize rural communities for relying on outdated water purification infrastructure
  2. explain the biological mechanism of slow sand filtration and highlight its enduring valueCevap
  3. C
    describe the physical maintenance process of manually scraping the schmutzdecke layer
  4. D
    advocate for replacing modern chemical flocculants in large municipal facilities

Cevap

The author wrote the passage primarily to explain the biological mechanism of slow sand filtration and highlight its enduring value.
The passage dedicates most of its discussion to explaining how the biological schmutzdecke layer purifies water and concludes by emphasizing why this low-infrastructure method remains valuable for rural areas.

Adım Adım Çözüm

1
Analyze the scope and progression of the paragraph
The text begins by contrasting slow sand filters with chemical rapid filters, explains how the biological layer (schmutzdecke) works, and concludes by underscoring why this method remains valuable for rural areas.
Determining the overall rhetorical flow helps separate the core message from individual supporting details.
2
Evaluate the author's tone and primary communicative goal
The tone is informative and appreciative of the technology's advantages in decentralized settings, not critical or overly argumentative.
Author intent depends on the attitude conveyed toward the subject matter.
3
Match the synthesized intent to the most comprehensive and accurate statement
The statement explaining the biological working principle while affirming its ongoing usefulness matches both the content and purpose.
The correct answer must encompass the whole passage rather than an isolated detail or an exaggerated claim.

Anahtar Kavram

Inferring the author's primary purpose requires identifying the central concept the writer wants the reader to understand and distinguishing it from minor supporting facts or unsupported assumptions.
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Konular

Inferring Author Purpose and Intent

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