完形填空 It was the kind of research that gave insight into how flu strains could mutate so quickly. The same branch of research concluded in 2005 that the 1918 flu started in birds before passing to humans. Parsing this animal-human 51 could provide clues to 52 the next potential superflu, which already has a name: H5N1, also known as avian flu or bird flu.
This potential killer also has a number: 59%. According to the WHO, nearly three-fifths of the people who 53 H5N1 since 2003 died from the virus, which was first reported 54 humans in Hong Kong in 1997 before a more serious 55 occurred in Southeast Asia between 2003 and 2004. (It has since spread to Africa and Europe.) Some researchers argue that those mortality numbers are exaggerated because WHO only 56 cases in which victims are sick enough to go to the hospitals for treatment. 57 , compare that to the worldwide mortality rate of the 1918 pandemic; it may have killed roughly 50 million people, but that was only 10% of the number of people infected, according to a 2006 estimate.
H5N1's saving grace—and the only reason we're not running around masked up in public right now—is that the strain doesn't jump from birds to humans, or from humans to humans, easily. There have been just over 600 cases (and 359 deaths) since 2003. But 58 its lethality, and the chance it could turn into something far more transmissible, one might expect H5N1 research to be exploding, with labs 59 the virus's molecular components to understand how it spreads between animals and 60 to humans, and hoping to discover a vaccine that could head off a pandemic.

【正确答案】 B

【答案解析】 本题考查的是词义辨析。rejection抛弃，拒绝；interface接触，界面；complement补语，补足物；contamination污染，污染物。句子的意思是分析这种动物—人类的接触现象……。前一句说鸟类之间的传播接触，这里提到动物和人之间的传播接触，故interface最符合题意，故选B。

【正确答案】 B

【答案解析】 本题考查的是动词用法。provide A to B意为“为B提供A”，A和B均为名词性成分。本句选项给的是动词stop，需要使用它的动名词形式stopping。stopping the next potential superflu为主动意义，不需要用被动态，且本句时态为现在时，需要保持时态一致。综上所述，故选B。

【正确答案】 A

【答案解析】 本题考查的是词义辨析。count计算，认为；amount to相当于，总计为；account for对……负有责任；accumulate累积。句子的意思是“WHO仅仅统计那些需要入院进行治疗的重病患者”。此处用的是“计算”的意思，count最适合，故选A。

【正确答案】 D

【答案解析】 本题考查的是逻辑关系。thereafter其后，从那以后；thereby从而，因此；furthermore此外，而且；still仍然。句子的意思是“即使如此，和1918年的大流感相比，这场禽流感应该导致了约五千万人死亡”。本句与前一句是并列的关系，翻译的时候根据后面的but可以用转折的译法，但本质上还是并列的关系。四个选项中只有still表达这样的关系，故选D。

【正确答案】 A

【答案解析】 本题考查的是介词辨析。given考虑到；regarding关于，至于；in spite of尽管，不顾；speaking of说到，谈及。句子的意思是“但是考虑到它的致命性和会转变为更具有传染性物质的可能性，人们还是希望更多地进行H5N1的研究……”。given最符合句意，故选A。

【正确答案】 C

【答案解析】 本题考查的是副词辨析。potently有说服力地；absolutely绝对地；potentially可能地，潜在地；importantly重要地，自命不凡地。句子的意思是“……借助实验室分析病毒的分子结构未了解它在动物之间的传播方式以及传染给人类的可能性……”。potentially符合句意，故选C。