Expression of IdeasVery hardUsing notes to accomplish a rhetorical goal
Expression of Ideas practice question
While researching a topic, a student has taken the following notes:
- A study measured air temperatures around clusters of trees in a large city.
- Within 50 metres of a cluster, the air was up to 2°C cooler than on treeless streets nearby.
- No cooling effect could be measured more than 100 metres from a cluster.
- The researchers describe the benefit as local.
The student wants to present the study's finding together with the limit on it. Which choice most effectively uses relevant information from the notes to accomplish this goal?
- A. Clusters of city trees can cool the surrounding air by up to 2°C, but the effect is local, disappearing beyond about 100 metres from the trees.Correct
- B. City trees cool the whole city by up to 2°C.
- C. The study measured air temperatures within 50 metres of tree clusters.
- D. Because no cooling was measured beyond 100 metres, trees do not cool the air.
Answer: A. Clusters of city trees can cool the surrounding air by up to 2°C, but the effect is local, disappearing beyond about 100 metres from the trees.
Both halves of the goal appear in choice A: the 2°C finding, and the distance beyond which it vanishes.
Why the other answers are wrong
- B. City trees cool the whole city by up to 2°C.
- This drops the limit and extends the finding to the whole city, which the notes contradict.
- C. The study measured air temperatures within 50 metres of tree clusters.
- This is method — where measurements were taken — not the finding or its limit.
- D. Because no cooling was measured beyond 100 metres, trees do not cool the air.
- This turns the limit into a denial of the finding. The notes report cooling of up to 2°C near the trees.
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