[originaltext] British scientists are preparing to launch trials of a radica

游客2023-08-04  31

问题  
British scientists are preparing to launch trials of a radical new way to fight cancer, which kills tumours by infecting them with viruses like the common cold. If successful, virus therapy could eventually form a third pillar alongside radiotherapy and chemotherapy in the standard arsenal against cancer, while avoiding some of the side-effects.
    Leonard Seymour, a professor of gene therapy at Oxford University, will lead the trials later this year. One of the country’s leading geneticists, Prof Seymour has been working with viruses that kill cancer cells directly, while avoiding harm to healthy tissue. "In principle, you’ve got something which could be many times more effective than regular chemotherapy," he said.
    Preliminary research on mice shows that the viruses work well on tumours resistant to standard cancer drugs. "It’s an interesting possibility that they may have an advantage in killing drug-resistant tumours, which could be quite different to anything we’ve had before."
    Researchers have known for some time that viruses can kill tumour cells and some aspects of the work have already been published in scientific journals. American scientists have previously injected viruses directly into tumours but this technique will not work if the cancer is inaccessible or has spread throughout the body.
    Prof Seymour’s innovative solution is to mask the virus from the body’s immune system, effectively allowing the viruses to do what chemotherapy drugs do—spread through the blood and reach tumours wherever they are. The big hurdle has always been to find a way to deliver viruses to tumours via the bloodstream without the body’s immune system destroying them on the way.
    The therapy would be especially useful for secondary cancers, which sometimes spread around the body after the first tumour appears. "There’s an awful statistic of patients in the west with malignant cancers; 75% of them go on to die from secondary cancers," said Prof Seymour.
    Several more years of trials will be needed, before the therapy can be considered for use in the NHS. Though the approach will be examined at first for cancers that do not respond to conventional treatments, Prof Seymour hopes that one day it will be applied to all cancers.
    20.What’s the possible advantage of virus therapy according to Prof Seymour?
    21.What’s the big challenge facing virus therapy?
    22.What does Prof Seymour want to do with virus therapy?

选项 A、It won’t have any side-effect.
B、It can kill drug-resistant tumours.
C、It can be as effective as conventional treatments.
D、It can stop cancer cells from spreading in the body.

答案 B

解析 本题问的是病毒疗法可能具有的优势。讲话中提到:“有意思的是,这些病毒可能具有这么一种优势——它们能杀死具有抗药性的肿瘤。”故选B项。选项中的it指代的是virus therapy,而possible advantage是对讲话中possibility that they may have an advantage的同义替换。kill drug—resistant turnouts是原词复现。其他三项均与讲话内容不符,故排除。
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