A. remain a theory to be further proved B. have been challenged by many other experts C. are practiced by the researchers themselves D. have been generally accepted 参考答案:C 答案解析:推理题。本题询问James和其他科学家们的理论现在处于一种什么样的状态,文章第三段的第一句话“Many experts are so convinced of the benefits of chal