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  3. According to the text, stem cells are hard to obtain because _____. It can be inferred from the passage that human cloning ____

According to the text, stem cells are hard to obtain because _____. It can be inferred from the passage that human cloning ____

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问题 According to the text, stem cells are hard to obtain because _____.
It can be inferred from the passage that human cloning _____.
选项 A、has not been so successful as some fertility doctors claim.
B、will definitely be banned through legislations.
C、has encountered huge technological and funding problems.
D、is another project being implemented by South Korean scientists.
答案A
解析 推理题。文章第四段开头说"尽管一些产科医生和宗教组织声称已经通过克隆技术让妇女怀孕，但是没有任何有说服力的证据"。说明克隆人不象一些大夫声称的那样成功。B项的错误在于，第一段末尾一句说"克隆人仍是个充满分歧的话题"，证明还没有肯定去禁止它的立法。C和D都是无中生有的新信息。
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