Expression of IdeasMediumExplaining why something works
Expression of Ideas practice question
While researching a topic, a student has taken the following notes:
- Cyclists in a group ride close behind one another.
- The rider in front pushes through the air and leaves a pocket of lower pressure behind.
- A rider in that pocket uses up to 30% less energy.
- Riders take turns at the front.
The student wants to explain why cyclists ride close behind one another. Which choice most effectively uses relevant information from the notes to accomplish this goal?
- A. The front rider pushes through the air and leaves a low-pressure pocket behind, so a rider tucked into it uses up to 30% less energy.Correct
- B. Cyclists ride in groups.
- C. Riders take turns at the front.
- D. Riding is tiring.
Answer: A. The front rider pushes through the air and leaves a low-pressure pocket behind, so a rider tucked into it uses up to 30% less energy.
The mechanism and the saving.
Why the other answers are wrong
- B. Cyclists ride in groups.
- Restates the behaviour.
- C. Riders take turns at the front.
- How the burden is shared, not why they ride close.
- D. Riding is tiring.
- A generality.
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