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导语：以下英语网为大家整理了全面的职称英语考试历年真题及答案解析，《职称英语考试试题汇总：历年真题及答案解析》供大家参考学习。更多职称英语考试试题敬请关注英语网！ 【推荐】关注英语网微信：yingyuwang2013，更快获取真题答案及成绩查询信息。 第6部分：完形填空（第51～55题，每题1分，共15分） 下面的短文有15处空白，请根据短文内容为每处空白确定一个最佳选项。 One Good Reason to Let Smallpox Live Its now a fair bet that we will never see the total extinction （灭绝） of the smallpox （天花） virus. When smallpox was completely got rid of in the world， scientists wanted to （51） the killer virus in the last two labs - one in the US and one in Russia. They asked： If smallpox has truly gone from the planet， （52） point was therein keeping these reserves？ in reality， of course， it was naive to （53） that everyone would let go of such a powerful potential weapon. Undoubtedly several nations still have （54） vials （小药瓶）。 And the last official stocks of live virus bred mistrust of the US and Russia， （55） no obvious gain. Now American researchers have （56） an animal model of the human disease， opening the （57） for tests on new treatments and vaccines （疫苗）。 So once again theres a good reason to （58） the virus -just in （59） the disease puts in a reappearance. | 
