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  3. One Good Reason to Let Smallpox Live It’s now a fair bet that we will never see the total extinction(灭绝) of the smallpox(天花)

One Good Reason to Let Smallpox Live It’s now a fair bet that we will never see the total extinction(灭绝) of the smallpox(天花)

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问题                     One Good Reason to Let Smallpox Live
    It’s 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 there in 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 there’s 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 that’s 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 doesn’t mean the idea is 【64】______. If the virus is useful, then let’s 【65】______ it the servant of all humanity, not just a part of it.

选项 A、in
B、for
C、at
D、of
答案B
解析 "for"在此句中意为"因为"。
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