题目内容
（请给出正确答案）
提问人：网友w*****2
发布时间：2022年6月13日 23:12
[单项选择题]
Scientists have for the first time used cloning to create human embryos that live long enough in a l...According to the text, stem cells are hard to obtain because
A．human embryos are very short-lived outside a human body.
B．human embryos are extremely hard to be cloned.
C．human genetic identity is difficult to be defined.
D．human cloning is strongly opposed by some researchers.
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