From the first paragraph, we learn that ______. The expression "snag" (Line 3, Paragraph 2) most probably means ______.

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问题 From the first paragraph, we learn that ______.
The expression "snag" (Line 3, Paragraph 2) most probably means ______.

选项 A、trap.
B、obstacle.
C、criticism.
D、advisory.

答案B

解析 第二段第四、五句The ethical snag is that the best stem cells are harvested from human embryos,killing them.For the most ardent pro-lifers,including...that is murder.本题为词义题,相对比较难,要求考生对文章的内容作细致的理解,推导出词的含义,同时还要对选项的词义熟悉。通过这两句可知很多人对这种研究是反对的,所以能够推出为"反对或问题,障碍"的意思,所以B正确。根据对上下文的理解即可知其他三个选项的说法都不够确切。
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