Heart attacks can be treated with human cloning technology by ______. According to the writer, the main problem with the develo

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问题 Heart attacks can be treated with human cloning technology by ______.
According to the writer, the main problem with the development of human cloning technology is flint _______.

选项 A、it may be out of human control
B、it has brought about few benefits so far
C、people still know little about it
D、people are afraid of such technology

答案D

解析 本题为细节题。从文章最后一句"if people will release their fears"中可得出答案。
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