题目内容
(请给出正确答案)
[主观题]
Cancer should be considered to be a biological problem rather than a medical one because _
_____.
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 tn species
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