❓ 题目 According to the passage, why do proponents prefer the mid-20th century as the start of the Anthropocene?
- A. A. Because agriculture first emerged during that period, marking a major human shift.
- B. B. Because it corresponds to a distinct global layer of radionuclides from nuclear tests.
- C. C. Because the Industrial Revolution began then, leading to rapid urbanization.
- D. D. Because critics acknowledge that human influence became gradual at that time.