题目

阅读理解 The Omicron Covid variant has been found to multiply about 70 times quicker than the original and Delta versions of coronavirus in tissue samples taken from the bronchus (支气管), the main tubes from the windpipe to the lungs, in laboratory experiments that could help explain its rapid transmission. The study, by a team from the University of Hong Kong, also found that the new variant grew 10 times slower in lung tissue, which the authors said could be an indicator of lower disease severity. Michael Chan, who led the work, said the result needed to be interpreted with caution because severe disease is determined not only by how quickly the virus replicates (复制) but also by a person's immune response. "It is also noted that by infecting many more people, a very infectious virus may cause more severe disease and death even though the virus itself may be less pathogenic (致病的), " he said. "Therefore, taken together with our recent studies showing that the Omicron variant can partially escape immunity from vaccines and past infection, the overall threat from the Omicron variant is likely to be very significant. " Jeremy Kamil, an associate professor of microbiology and immunology at Louisiana State University Health Shreveport, pointed out that Delta, which turned out to be more pathogenic, showed a similar pattern of replicating more slowly in the lungs. "These authors found Omicron replicates fantastically well--even far better than either Delta or the original virus--in bronchial tissue, " Kamil said. "This could in some ways contribute to an advantage in transmission between people. " Kamil added, "Of course, a huge component of Omicron's transmissibility in real life is going to be its potential to escape neutralising antibodies that protect against infection in the first place. It's very likely spreading well even between vaccinated people, especially those who haven't recently gotten a booster shot. " The findings, together with other recent work showing Omicron infects cells more readily, add to an emerging picture that the variant may be intrinsically more transmissible in addition to escaping existing immunity. （1） What is the kind of the passage? A . A news report. B . A science fiction. C . A health guide. D . A medicine advertisement. （2） What could Jeremy Kamil agree with? A . We should take the result seriously. B . Omicron may cause more severe disease and death. C . Both Omicron and Delta grew slowly in the lungs. D . Those who have gotten a booster shot won't be infected. （3） What can we learn about Omicron? A . It is a new variant of Delta. B . Delta is less pathogenic than it. C . Vaccinated people needn't worry about it. D . It may pose a great threat to people's health. （4） According to the passage, which of the following may cause Omicron's transmissibility? A . That many people haven't been vaccinated. B . That many people refused to wears masks in public. C . That Omicron infects lung cells much more quickly. D . That existing immunity plays a poor part in fighting Omicron. 答案： A C D D

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