填空题 At least 17 of these "cancer genes" have been identified, and 1 every case they appear to be identical or very similar to normal genes found in healthy cells.
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【正确答案】 1、in    
【答案解析】[译文] 至少有17种致癌基因已被确定，并且这些基因在各方面都与健康细胞中的正常基因完全相同或十分相似。