Questão 1

A neighborhood planted 200 riverside trees. Two summers later, air beside the trees was about 2 °C cooler than on nearby bare streets. What is the main idea?

1. The trees caused a permanent drop in the city's temperature.
2. Planting trees was followed by cooler air near the river.
3. Bare streets are always warmer than parks in every city.
4. Sensors cannot measure small temperature differences.