2. 外语
  3. It seems individual cancer cells send out the same distress signals as wounds, tricking immune cells into helping them grow into

It seems individual cancer cells send out the same distress signals as wounds, tricking immune cells into helping them grow into

admin2021-02-02  8
问题        It seems individual cancer cells send out the same distress signals as wounds, tricking immune cells into helping them grow into tumours. The finding suggests that anti-inflammatory drugs could help to combat or prevent cancer. "Lifelong, if you take a small quantity of something that【C1】______ inflammation （炎症）, such as aspirin, it could reduce the risk of cancer," says Adam Hurlstone of the University of Manchester, UK.
       When tissue is wounded or infected it produces hydrogen peroxide. White blood cells called leukocytes （白细胞） are among the first cells to react to this【C2】______  , homing in to kill the infectious agent, clean up the mess and rebuild【C3】______  tissue. At first, the tissue becomes inflamed, but this subsides as the wound is cleared and rebuilding continues. Now, a study in zebra fish shows that this process is also instigated （唆使） and sustained by tumour cells.
       Hurlstone and his colleagues【C4】______  engineered zebra fish so that skin cells and leukocytes would show different【C5】______  under ultraviolet light. Some zebra fish were also engineered to have cancerous skin cells.
       The team found that the cancerous skin cells secreted （分泌） hydrogen peroxide,【C6】______  leukocytes which helped them on their way to become a tumour. When the team【C7】______  hydrogen peroxide production in the zebra fish, the leukocytes were no longer attracted to cancerous cells and the cancer colonies reduced in【C8】______.
       More alarmingly, the researchers found that healthy skin cells【C9】______ to the cancerous ones also produced hydrogen peroxide, suggesting that cancer cells【C10】______   co-opt them into triggering inflammation.
A） adjacent
B） blocked
C） changed
D） colors
E） damaged
F） figure
G） genetically
H） hue
I） hurtful
J） number
K） somehow
L） somewhat
M） summoning
N） suppresses
O） trigger
【C1】
选项
答案N
解析 动词辨析题。分析句子结构可知,空格所在从句为that引导的定语从句,修饰先行词something,定语从句中缺少谓语,故空格处应填动词。根据空格后的单词inflammation以及阿司匹林的例子,再结合上一句中所说消炎药可能起到抗癌或者防癌的作用，可以推断出suppresses符合句意,用在此处表示“抑制”。
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大学英语四级

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