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  3. 　　Currently, doctors classify headaches into two general types: primary and seco

　　Currently, doctors classify headaches into two general types: primary and seco

游客2023-10-16  71
问题 　　Currently, doctors classify headaches into two general types: primary and secondary.A primary headache is a condition suffered as only the headache itself.On the other hand, a secondary headache is one caused by another condition.For example, someone who catches the flu may suffer from headaches along with other symptoms of the illness.Flu headaches are thus secondary headaches.For primary headaches, doctors have determined three possible causes.One kind of primary headache is caused by stress.Doctors usually call these tension headaches.Such headaches are characteristically felt on both sides of the head as a dull, steady pain.Another kind of primary headache is the migraine headache.Doctors believe these headaches are caused by reduced flow of blood to certain parts of the brain.A migraine sufferer usually feels intense pain on one side of the head.The sufferer also becomes sensitive to light and noise.If the migraine is severe, the sufferer may vomit repeatedly.
　　With the help of technology, doctors have now gained detailed insight into how the brain works and what happens when a person suffers from a headache.Through this research, headaches have been ________ into primary and secondary headaches.
选项
答案 classified
解析 由“ primary, secondar,” 可定位至该段第一句和第二句“Currently, doctors classify headaches into two general types: primary and secondary.A primary headache is a condition suffered…”即目前，医生将头痛分为两大类:原发性和继发性。原发性头痛是一种仅限于头痛本身的疾病。 cassfy 意为.“…分类”，注意空缺所在句子涉及被动语态,故本空填classified。
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