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.
【K5】

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答案it

解析 考查代词。此处用it代替前面的a headache。
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