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Zorluk: OrtaImplicit Main Idea

Throughout the 1920s, coastal defense units erected massive concave concrete structures along the English Channel to focus the sound vibrations of approaching airplane engines into sensitive microphones. In calm weather, these passive reflectors could detect incoming bombers up to fifteen miles away. However, ambient noise from crashing surf and shifting wind currents frequently distorted acoustic returns. Concurrently, newer military aircraft achieved flight speeds exceeding two hundred miles per hour, shrinking the reaction interval between initial sound capture and arrival overhead to under two minutes.

Which of the following statements best expresses the implied main idea of the passage?

  1. A
    Concave concrete reflectors successfully detected incoming aircraft at distances reaching fifteen miles during optimal atmospheric conditions.
  2. Environmental vulnerabilities and increasing flight speeds made acoustic monitoring obsolete for early warning defense.Cevap
  3. C
    Early twentieth-century military engineering projects invariably failed because natural environmental forces could not be overcome.
  4. D
    Military authorities abandoned coastal acoustic listening posts to accelerate the development of electronic radar installations.

Cevap

Environmental vulnerabilities and increasing flight speeds made acoustic monitoring obsolete for early warning defense.
The correct response accurately synthesizes the unstated central claim. The author contrasts the theoretical utility of concrete sound mirrors with their severe practical limitations—specifically, surf noise/wind interference and drastically reduced reaction times caused by faster planes—demonstrating that acoustic listening posts were no longer viable for air defense.

Adım Adım Çözüm

1
Analyze the passage structure and identify the core supporting details
The text describes early acoustic concrete reflectors, highlights how wind and surf noise distorted their returns, and notes that faster aircraft reduced response windows to under two minutes.
When a paragraph contains no single topic sentence, understanding each factual premise is required to infer the central point.
2
Synthesize the combined implications of the supporting evidence
The combination of severe environmental interference and rapid advances in aircraft speed made sound-based warning systems practically ineffective.
Determining an implicit main idea requires combining all major supporting points into a single coherent thesis.
3
Evaluate the answer choices to identify the synthesis while eliminating details, broad generalizations, and outside claims
The choice stating that environmental vulnerabilities and increasing flight speeds made acoustic monitoring obsolete for early warning defense encapsulates the full passage accurately.
The correct answer must represent the entire paragraph without narrowing to a single fact or introducing unsupported outside concepts.

Anahtar Kavram

Synthesizing an unstated central message from supporting evidence in an informational text.
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Konular

Implicit Main Idea

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