2016中考备考阅读话题练习：饮食与健康(含答案)

What are headaches? What 41.                 them? And when should you go 42.                 a doctor? A headache is a 43.                 in your head. It's not a disease itself, but it may show that something is wrong 44.                 your health. Usually a fever will cause a headache. You might 45.                 a headache when you work too 46.                 or when you don't get 47.                 sleep. You can also get a headache when you exercise 48.                 a long time 49.                 an empty stomach. If you get headaches often, you 50.                 to see doctor.