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A . viruses are known

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A . viruses are known to cause cancer in animals
B . at present，human cancer is not believed to be contagious(传染的)
C . there are many known causes for the transformation of a normal cell to a cancer cell
D . results of experiments on plants and animals do not vary greatly from species to species

参考答案:

参考答案：D

参考解析:本题暂无解析

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