Passage

Public parks provide places for exercise, recreation, and social interaction. In crowded cities, they also offer a valuable connection to nature.

Question

What is the main idea of the passage?

Answer

Public parks offer important health, social, and environmental benefits in cities.

Solution

1. Both sentences describe benefits provided by public parks.
2. Exercise, recreation, interaction, and nature are supporting details.
3. The answer combines those details into the central point.