isabled to make\r（资料搜集：范文百科网 www.bk188.cn 网罗天下 www.web17.cn）\rthem less pathogenic in the trial, but Prof Seymour said he eventually hopes to use\rnatural viruses. ）\r11. 答案：natural ones （见第 13 段最后 1 句：For safety reasons, both will be disabled to\rmake them less pathogenic in the trial, but Prof Seymour said he eventually hopes to use\rnatural viruses. ）\r12. 答案：dosage （见第 14 段第 1 句：The first trials will use uncoated adenovirus and\rvaccinia and will be delivered locally to liver tumours, in order to establish whether the\rtreatment is safe in humans and what dose of virus will be needed.）\r13. 答案：directed （见第 14 段最后 1 句：Though the approach will be examined at first\rfor cancers that do not respond to conventional treatments, …）\r（资料搜集：范文百科网 www.bk188.cn 网罗天下 www.web17.cn）
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