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Difficulty: EasyExplicit Main Idea

Proper tire pressure is critical for ensuring the safe operation and fuel efficiency of military transport vehicles. When tires are underinflated, the increased friction causes excessive heat buildup, which can lead to sudden tread separation and dangerous blowouts on rough terrain. Furthermore, low pressure increases rolling resistance, forcing the engine to consume significantly more fuel during long supply convoys. Routine pre-trip pressure checks prevent these mechanical hazards and reduce unnecessary fleet maintenance costs.

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

  1. A
    Military supply convoys require extensive routine vehicle maintenance to operate under harsh conditions.
  2. Maintaining correct tire pressure is essential for the safety and fuel performance of transport vehicles.Answer
  3. C
    Underinflated tires cause excessive heat buildup that leads to dangerous tread separation.
  4. D
    Low tire pressure forces vehicle engines to burn excess fuel during long supply operations.

Answer

Maintaining correct tire pressure is essential for the safety and fuel performance of transport vehicles.
The correct response directly restates the explicitly stated topic sentence found at the beginning of the passage, summarizing both primary points: vehicle safety and fuel efficiency.

Step-by-Step Solution

1
Locate the explicit topic sentence in the paragraph.
The first sentence directly states: 'Proper tire pressure is critical for ensuring the safe operation and fuel efficiency of military transport vehicles.'
Explicit main ideas are directly stated within the text, frequently in the opening sentence.
2
Evaluate the subsequent sentences to verify they serve as supporting details.
The following sentences provide specific evidence: one explains the safety hazard (heat buildup and blowouts) and the next explains the efficiency impact (increased fuel consumption).
Confirming that remaining details develop the opening claim ensures the topic sentence is indeed the overarching main idea.
3
Match the core claim to the corresponding answer choice.
The statement expressing that maintaining correct tire pressure is essential for safety and fuel performance directly paraphrases the topic sentence.
The correct choice must capture the comprehensive main idea rather than an isolated detail or broad generalization.

Key Concept

Explicit Main Idea
Estimated Time:45s
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Explicit Main Idea

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