Resposta
The new riverside trees were associated with cooler local summer temperatures.
Explicação
The passage reports a measured temperature difference after planting, so the safest main idea is the local link it describes, not a universal claim.
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A riverside neighborhood planted 200 trees along its bank. Two summers later, sensors showed that air beside the trees was about 2 °C cooler than on nearby bare streets. What is the main idea?
Flashcard de estudo do deck PAES essentials — original practice.