9
Answer: ASet 4: Text Structure (Advanced)
Explanation
PASSAGE
In a vacuum, a feather and a hammer fall at the same rate. Air resistance, however, acts as a drag force proportional to surface area. Ideally, gravity is universal; realistically, friction complicates the observation.
Which choice best describes the text's logical structure?
A. Theoretical Ideal -> Real-world Variable -> Observed Difference✓ Correct
B. Observation -> Hypothesis -> Rejection
C. Comparison of two tools.
D. Instruction on how to drop things.
Detailed Explanation
Ideal: Vacuum (Same rate). Variable: Air resistance (Friction). Reality: Complicates observation.
Key Evidence:
• "In a vacuum"
• "Air resistance, however"
• "Ideally ... realistically"
Why others are wrong: B (Explains difference.), C (Physics focus.), D (No instructions.).