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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.
How do we （60） with the mistrust of the US and Russia？ （61） 。 Keep the virus （62） international support in a well-guarded UN laboratory thats open to all countries. The US will object， of course， just as it （63） a multilateral （多边的） approach to just about everything. But it doesnt mean the idea is （64） 。 If the virus is useful， then lets （65） it the servant of all humanity - not just a part of it.
51 A destroy B improve C change D transport
52 A which B that C this D what
53 A know B realize C imagine D understand
54 A more B few C a few D a lot
55 A in B for C at D of
56 A missed B held C found D checked
57 A way B road C route D method
58 A put B keep C remove D study
59 A need B time C fact D case
60 A handle B tackle C treat D deal
61 A Simple B Open C Safe D Possible
62 A for B in C on D with
63 A adopts B rejects C suggests D introduces
64 A difficult B clear C wrong D correct
65 A take B do C make D ask