❓ 题目 According to paragraph 2, what is one reason critics oppose formalizing the Anthropocene as a geological epoch?
- A. A. The proposed marker is not found in rock layers.
- B. B. Human impact started much earlier than the mid-20th century.
- C. C. The term is too popular among non-scientists.
- D. D. There is no evidence of nuclear fallout in sediments.