Ⅱ.阅读填空

　　Headaches

　　A headache is a pain in the head which almost everyone feels at one time or another.Almost half of all people have a headache at least once a year.Most headaches are not dangerous but they get in the way of your work and disturb your life.

　　4

　　Tension(紧张)headaches usually cause a slight to strong pain in the head.Many people describe such headaches as a tightening feeling.Some headaches cause a dull pain that can last for hours.They appear anywhere from the front to the back of your head.

　　About 20% of all headaches are migraines，which are strong headaches that can cause extreme pain.

　　5

　　You will have a feeling of sickness in the stomach，and sometimes you may see flashes of light shortly before migraines attack.

　　Causes of headaches

　　6

　　Even though the exact causes of a headache are not clear，most of them are caused by the widening of blood vessels(血管)combined with chemicals that are set free around them.Nerves send pain messages to your brain.There are many factors that can lead to a headache，such as lack of sleep，stress，smoking or watching TV for a long time.

　　7

　　How to fight off headaches

　　Pain relievers(止痛剂)and other drugs are often used to ease headaches.Many people take aspirin when they have a headache.Doctors also suggest that patients should relax when they experience a headache.In some cases，changing your diet may result in relieving pain and weakening headaches.

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