❓ 题目 According to the passage, which of the following best illustrates the concept of 'ecological resilience' as opposed to 'engineering resilience'?
- A. A forest that recovers quickly to its original tree density after a fire.
- B. A grassland that remains grassland despite a prolonged drought, because it has not crossed a threshold into shrubland.
- C. A river that returns to its normal flow rate within hours after a flash flood.
- D. A coral reef that regains its pre-bleaching color within a year after water temperatures cool.