【单选题】
There are three main types of the influenza virus. The most important of these are typeA、andB, each of them having several subgroups. With the instruments at the hospital, the doctor recognized that the outbreak was due to a virus in groupA, but he did not know the subgroup. Then he reported the outbreak to the World Health Organization in GenevA、WHO published the important news alongside reports of a similar outbreak in Hong Kong, where about 15-20 percent of the population had become ill.
As soon as the London doctors received the package of throat samples, doctors began the standard tests. They found that by reproducing itself with very high speed, the virus had grown more than a million times within two days.Continuing their careful tests, the doctors checked the effect of drugs against all the known subgroups of virus typeA、None of them have any protection. This, then, was something new, a new influenza virus, against which the people of the world had no help whatever.
Having found the virus they were working with, the two doctors now dropped it into the noses of some specially selected animals, which get influenza much as human beings do. In a short time the usual signs of the disease appeareD、These experiments proved that the new virus was easy to catch, but that it was not a killer. Scientists, like the general public, call it simplyAsian flu.
The first discovery of the virus, however, was made inChina before the disease had appeared in other countries. Various reports showed that the influenza outbreak started inChina, probably in February 1957.By the middle March it had spread all overChinA、The virus was found byChinese doctors early in March.ButChina is not a member of the WHO and therefore does not report outbreaks of disease to it. Not until two months later, when travelers carded the virus into Hong Kong, from where it spread to Singapore, did the news of the outbreak reach the rest of the worlD、By this time it was well on its way around the worlD、
B．and had rather mild effects
C．but was not deadly
D．and did not have the usual signs
网考网参考答案：C
网考网解析：
[分析] 词义题型 见第四段第三句：These experiments proved that the new virus was easy to catch，but that it was not a killer．Scientists like the general public，call it simply Asian flu. (这些试验证实这种新的病毒很易感染，但并不致命。)在此须弄懂not a killer之意， “不是杀手”即“并不致命”，因此C为答案。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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