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阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案，并涂在答题卡相应的位置上。 One Good Reason to Let Smallpox Live Its now a fair bet that we will never see the total extinction of the smallpox virus.The idea was to cap the glorious achievement of 1 980，when smallpox was eradicated in the wild，by destroying the killer virus in the last two labs that are supposed to have it -- one in the US and one in Russia?If smallpox had truly gone from the planet，what point Was there in keeping these reserves? __1__reality，of course，it was naive to __2 __ that everyone would let __3__ of such a potent potential weapon.Undoubtedly several nations still have__4__ vials. __5__ the lastofficialstocks of live virus bred mistrust of the US and Russia,__6__ no obvious gain. Now American researchers have __7__ an animal model of the human disease, opening the __8__for tests on new treatments and vaccines.So once again theres a good reason to__9__ the virus--just in __10__ the disease puts in a reappearance. How do we __11__ with the mistrust of the US and Russia? __12__.Keep the virus __13__ international auspices in a well-guarded UN laboratory thats open to all countries.The US will object，of course，just as it rejects a multilateral approach to just about everything.But it doesnt __14__the idea is wrong.If the virus __15__ useful，then lets make it the servant of all humanitynot just a part of it. | 
