Set 12: Transitions
Explanation
PASSAGE
Vaccines work by training the immune system to recognize and fight specific pathogens. The body develops memory cells that can quickly respond to future infections. _______ this process typically takes several weeks, which is why vaccination must occur before exposure to be effective.
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 time factor is a crucial detail about how vaccines work. 'Importantly' signals that this information is essential to understanding the process. 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:
• "body develops memory cells"
• "vaccination must occur before exposure"
Why others are wrong: A (Contrast - there's no unexpected element here.), D (Contrast - the timing explains, not contradicts, the mechanism.), B (Comparison - this is a key detail, not a parallel point.).
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