题目内容
（请给出正确答案）
A.但是要制造一头新的猛犸所需的完整的DNA和他的基因蓝图还是有可能的。
B.但是克隆一头猛犸的首要前提是在生物界可能的范围内获得完整的DNA和动物的基因蓝图。
C.但是克隆一头猛犸的先决条件至少已经具备，那就是取得完整的DNA，即这种动物的基因蓝图。
D.但是克隆一头猛犸的先决条件至少已经具备，那就是取得完整的DNA和这种动物的基因蓝图。
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