❓ 题目 According to the passage, which of the following is a major challenge in applying the concept of ecosystem services?
- A. A) The difficulty in defining what constitutes a provisioning service.
- B. B) The spatial and temporal mismatch between service provision and human benefit.
- C. C) The lack of any economic value for cultural services.
- D. D) The overemphasis on intrinsic values in environmental policy.