Set 12: Transitions (Intermediate)
Explanation
PASSAGE
Climate scientists use ice cores from Antarctica to reconstruct past atmospheric conditions. Air bubbles trapped in the ice contain samples of ancient atmospheres stretching back hundreds of thousands of years. _______ isotope ratios in the ice itself reveal past temperatures with remarkable precision.
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. Two types of evidence from ice cores: 1) air bubbles → atmosphere, 2) isotopes → temperature. 'Additionally' adds the second type of evidence. 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:
• "Air bubbles trapped"
• "isotope ratios... reveal past temperatures"
Why others are wrong: C (Contrast - these are complementary sources, not contradictory.), B (Cause/effect - isotopes aren't a result of air bubbles.), D (Contrast - both provide evidence; they're not opposed.).
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