单选题 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?
(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 last "official" stocks 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 there's 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 that's open to all countries. The US will object, of course, just as it rejects a multilateral approach to just about everything. But it doesn't (14) the idea is wrong. If the virus (15) useful, then let's make it the servant of all humanity — not just a part of it.

单选题 A. In B. On C. At D. For
【正确答案】 A
【答案解析】[解析] 选项是介词，注意搭配结构。In reality“实际上，事实上”是固定搭配。
单选题 A. know B. imagine C. realize D. be aware
【正确答案】 B
【答案解析】[解析] 借助选项特点：know=be aware，排除A和D，再借助搭配结构判断B是答案。
单选题 A. to go B. going C. go D. went
【正确答案】 C
【答案解析】[解析] let跟原形动词，go符合这一原则。
单选题 A. much B. more C. most D. a few
【正确答案】 D
【答案解析】[解析] 根据搭配结构“……小瓶”，判断D最合适(而且该句和前句中都没有出现比较的含义)。
单选题 A. And B. While C. Whereas D. Although
【正确答案】 A
【答案解析】[解析] 该句结构是“句子+短语结构”，因此空格5处的连词必须能引导一个独立的句子，这样判断只有A合适(其他选项都只能引导从句结构)。
单选题 A. since B. for C. because D. of
【正确答案】 B
【答案解析】[解析] 借助选项的特点判断B和C相似，但用法不同，再借助空格后是名词性结构这个特点判断B合适。
单选题 A. looked for B. sought C. found D. talked about
【正确答案】 C
【答案解析】[解析] 借助选项的特点判断A和C有关系：前者是“寻找”，后者是“找到”。借助该句子主干结构大意：“现在美国研究者已经……，开启了……”，这样判断C合适。
单选题 A. method B. road C. street D. way
【正确答案】 D
【答案解析】[解析] 借助选项的特点：method的习惯搭配介词是of，因此排除A；B和C都是具体指代“街道”，而way可以抽象和具体的指代“道路”，判断D合适。open the way为……创造条件；clear the way扫清道路，让路；on the way to在……途中；find one's way out找到某人出去的路；寻找解决方法。
单选题 A. keep B. put C. destroy D. eradicate
【正确答案】 A
【答案解析】[解析] 该句的结构与标题的结构一致，因此借助标题内容直接判断A是答案。
单选题 A. need B. case C. necessity D. time
【正确答案】 B
【答案解析】[解析] 借助搭配结构“in”判断A，B和a可能是答案，再根据空格后是一个句子的特点判断B是答案。
单选题 A. handle B. tackle C. deal D. treat
【正确答案】 C
【答案解析】[解析] 借助搭配“…with”直接判断C是答案。
单选题 A. Difficult B. Hard C. Safe D. Simple
【正确答案】 D
【答案解析】[解析] 借助下文句子是在教人们怎样做(祈使句结构)，因此判断D是答案。
单选题 A. under B. in C. on D. for
【正确答案】 A
【答案解析】[解析] 选项是介词，所以注意搭配结构：keep...in a...laboratory；...international auspices(赞助)，根据介词的基本含义和用法，判断A是答案。
单选题 A. say B. mean C. state D. declare
【正确答案】 B
【答案解析】[解析] 因为空格是作谓语，而句子主语“非人”，所以A，C和D都不行(这些词的主语往往都是是“人”)。
单选题 A. will be B. would be C. is D. are
【正确答案】 C
【答案解析】[解析] 首先借助后面主句中的代词it判断前面的the virus应该是单数，而且状语从句结构中只能用一般时态来表示将来，所以判断C是答案。