题目内容：
回答题：One Good Reason to Let Smallpox Live
It's now a fair bet that we will never see the total extinction of the smallpox virus. The idea was to cap the glorious achiew~'ment of 1980, when smallpox was eradicated in the wild, by destroying the killer virus in the last twe 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?__________(51) reality, of course, it was naive to __________(52) that everyone would let__________(53) of such a potent potential weapon.Undoubtedly several nations still have__________(54) vials.__________(55) the last "official" stocks of live virus bred mistrust of the US and Russia, __________(56) no obvious gain.
Now American researchers have__________ (57) an animal model of the human disease, opening the __________(58 ) for tests on new treatments and vaccines. So once again there's a good reason to __________(59) the virus--just in "__________(60) the disease puts in a reappearance.
How do we __________ (61) with the mistrust of the US and Russia?__________(62) . Keep the virus __________(63) international auspices in a well-guarded UN laboratory that's open to all countries. The US will object, of course, just at it rejects a multilateral approach to just about everything. But it doesn't __________(64) the idea is wrong. If the virus __________(65) useful, then let's make it the servant of all humanity--not just a part of it.
A．For
B．At
C．On
D．in
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