A. is in favor of stem-cell research. B. welcomes the research slowdown. C. takes a neutral stand on the research. D. thinks it essential to speed up the research. 参考答案:A 答案解析:推断题。由题干定位至首段。末句指出:如果找不到更多的细胞株,研究就会停下来,这会让人们遭受极大的痛苦。可见,作者是认同体细胞研究的,故[A]为答案。[B]与此矛盾,排除。首段未提及加快研究速度,[D]