Set 7: Transitions
Explanation
PASSAGE
Dark matter constitutes approximately 27% of the universe's mass-energy content, yet its nature remains unknown. It does not emit, absorb, or reflect light, detectable only through gravitational effects on visible matter. _______ decades of experiments have failed to directly detect dark matter particles, leading some physicists to question whether modified gravity theories might better explain the observations.
Which choice completes the text with the most logical transition?
Detailed Answer Explanation
This question asks you to choose the transition that best connects two ideas. The failure to detect dark matter is disappointing given the effort invested. 'Frustratingly' captures this scientific disappointment. Transitions signal the relationship between sentences or paragraphs. Determine the logical relationship (addition, contrast, cause-effect, example) and select the transition that accurately expresses it. The right transition makes the relationship between ideas crystal clear. Consider what logical connection exists: Is the second idea adding to the first? Contrasting it? Showing a result? The transition should accurately reflect this relationship.
Key Evidence:
• "nature remains unknown"
• "decades of experiments have failed"
Why others are wrong: C (Emphasis - the failure is a problem, not confirmation of the unknown nature.), A (Cause/effect - the failure isn't a logical result of the unknown nature.), B (Comparison - this is a complication, not a similar point.).
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