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  3. Two groups of scientists demonstrated last week for the first time that the body launches a massive, effective counter-attack on

Two groups of scientists demonstrated last week for the first time that the body launches a massive, effective counter-attack on

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问题     Two groups of scientists demonstrated last week for the first time that the body launches a massive, effective counter-attack on the virus soon after infection of HIV begins. If doctors can figure out how to reproduce that early, powerful immune response, they might be able to develop better treatments to (47)______ stages of the disease. The researchers should be (48)______—and more than a bit of luck. After all, to study someone at the beginning of a relatively (49)______ phase of the HIV infection, they had to find people who did not yet realize they had contracted the virus. It (50)______ that at least a third of HIV-infected people develop a fever or a severe sore throat within a few weeks to months after first (51)______. Such signs, which usually clear up in their own, can easily be (52)______ as a bad flu. In order to identify seven young men suffering from a primary HIV infection, the researchers took this project by (53)______ in hospital emergency rooms and talking to colleagues.
    Using advanced laboratory tests that had been developed only in the past few years, both sets of scientists discovered an (54)______ growth of virus in the men’s blood streams. Each liter of the men’s blood contained as many as 10 million infectious viruses.
    Within days after the virus burst, the researchers measured a rapid increase in the bloodstream of the number of anti-HIV antibodies(抗体). These Y-shaped bits of protein sought out the virus and targeted it for (55)______. Once the antibody attack reached full scale in the seven test subjects, the level of HIV in the bloodstream dropped (56)______. In the majority of cases, the researchers could detect little or no virus two to three weeks later. In other words, the normal immune system can shut down the AIDS virus. Now researchers must figure out exactly how the body puts together this early effective defense and how the virus manages, years later, to avoid it.

                  Word Bank:
A. destruction                 I. abruptly
B. interrupt                   J. segregation
C. impair                      K. testifies
D. residing                    L. lively
E. misdiagnosed                M. explosive
F. exemplified                 N. silent
G. persistent                  O. exhausting
H. exposure

选项
答案G
解析 单从句子结构上看，空中可填入形容词与be构成系表结构，也可以填入过去分词构成被动语态。此处说科学成果的取得不能只靠一点运气，言外之意是强调研究者需要献身精神(这一点从后文的内容中也可推知)。persistent意为“坚持不懈的，持之以恒的”，与此处的语义相符，因此G为答案。L. lively“活泼的”和N. silent“沉默的”与科研的语境不符：O. exhausting不能修饰人。此处不强调被动，因此排除E. 和 F。
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