Almost everyone suffers from a headache【K1】______(occasional). But some people suffer from repeated, frequent headaches. What

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问题    Almost everyone suffers from a headache【K1】______(occasional). But some people suffer from repeated, frequent headaches.
   What is headache? What causes it? What can you do about a headache? What research is being done on headaches? The dictionary defines headache simply【K2】______"a pain in the head".【K3】______most people mean by headache【K4】______(be) a pain that lasts several minutes or hours. It covers the whole head, or one side of it, or perhaps the front or the back of the head. To add to the confusion about a definition, some people call tight feeling in the head a headache.
   A headache is important because【K5】______can be the first warning of a serious condition which probably could be controlled【K6】______discovered early. If a person【K7】______(remove) the warning, day after day, with a pain-killer, he may pass the point of easy control.
   A headache is important also because it disturbs people,【K8】______(prevent) them from living a happy life. The【K9】______(employ) with a headache does less work. In a flash of temper he may upset his fellow【K10】______(guy) or customers, causing a direct or indirect loss to his organization. The mother with a headache suffers and disturbs the family. She upsets her husband and children.
【K8】

选项

答案preventing

解析 考查非谓语动词。在because引导的从句中已有谓语动词,这里要用非谓语动词形式。该动词表示的动作与前面的主语it构成逻辑上的主谓关系,故用其现在分词形式preventing。
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