Set 6: Transitions
Explanation
PASSAGE
The search for extraterrestrial intelligence (SETI) has scanned thousands of star systems without detecting artificial signals. This null result might indicate that intelligent life is extremely rare, or that civilizations develop in ways that don't involve detectable electromagnetic emissions. _______ the absence of evidence, as Carl Sagan noted, is not evidence of absence.
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. Sagan's observation is a well-known caveat that qualifies the previous interpretations. 'Of course' acknowledges this standard philosophical point. 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:
• "null result might indicate"
• "absence of evidence is not evidence of absence"
Why others are wrong: A (Restatement - Sagan's point is a qualification, not a restatement of the interpretations.), C (Cause/effect - the caveat doesn't follow logically from the interpretations.), D (Specific detail - Sagan's point is a general principle, not a specific detail.).
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