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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 of the smallpox virus.

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.

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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 of the smallpox virus. The idea was to cap the glorious achievement of 1980, 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?
    【C1】______reality, of course, it was naive to【C2】______that everyone would let 【C3】______of such a potent potential weapon. Undoubtedly several nations still have 【C4】______vials. 【C5】______the last "official" stocks of live virus bred mistrust of the US and Russia,【C6】______no obvious gain.
    Now American researchers have【C7】______an animal model of the human disease, opening the【C8】______for tests on new treatments and vaccines. So once again there’s a good reason to【C9】______the virus—just in【C10】______the disease puts in a reappearance.
    How do we【C11】______with the mistrust of the US and Russia?【C12】______. Keep the virus【C13】______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【C14】______the idea is wrong. If the virus【C15】______useful, then let’s make it the servant of all humanity—not just a part of it.
【C6】
选项 A、since
B、for
C、because
D、of
答案B
解析 整个句子说的是美俄“官方”保存的最后的活病毒储备由于不能带来明显的好处而引起大家对这两个国家的不信任。no obvious gain是名词短语。for可跟名词短语，表示原因。because不跟名词短语。since可跟名词短语，但跟表示时间的名词短语。of可跟名词短语，但常表示“所属”关系。
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