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Question

Difficulty: HardIdentifying Synonymous Context Clues

During high-altitude reconnaissance missions, meteorological officers must closely monitor the formation of noctilucent clouds. These ethereal—that is, uncharacteristically delicate and airy—ice crystal formations develop in the mesosphere and can distort optical telemetry. Because they remain nearly invisible during daylight hours, tracking systems rely on ultraviolet scattering to identify their presence before sensor readings become erratic.

As used in the passage, the word "ethereal" most nearly means which of the following?

  1. A
    erratic and unpredictable
  2. delicate and airyAnswer
  3. C
    spiritually divine
  4. D
    dense and crystalline

Answer

In this passage, 'ethereal' most nearly means 'delicate and airy.'
The correct answer accurately captures the contextual synonym provided in the text. The author uses a clarifying appositive construction set off by dashes ('—that is, uncharacteristically delicate and airy—') to define 'ethereal' directly for the reader.

Step-by-Step Solution

1
Locate the target word in the passage and identify surrounding punctuation or structural clues.
The word 'ethereal' is immediately followed by a parenthetical phrase enclosed in em-dashes: '—that is, uncharacteristically delicate and airy—'.
Authors frequently use em-dashes along with transition phrases like 'that is' to provide an explicit appositive definition or synonymous clarification of an unfamiliar or specialized term.
2
Extract the synonym provided within the structural clue.
The text directly equates 'ethereal' with being 'delicate and airy.'
The clue defines the physical nature of these particular mesospheric ice formations.
3
Evaluate the answer choices against the textual definition and eliminate distractors.
The option stating 'delicate and airy' matches the exact restatement provided in the text.
Other choices rely on verbatim terms from later in the passage, out-of-context dictionary meanings, or unsupported assumptions about cloud density.

Key Concept

Identifying Synonymous Restatements via Appositives and Transitional Markers
Estimated Time:1m 5s
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Topics

Identifying Synonymous Context Clues

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