根据短文内容，判断下列句子是否正确。对的写“A"，错的写“B"。

     What are headaches? What may cause them? And when should we go to see a doctor?

     A headache is not a disease, but it may show that something in your body is wrong. We may have more

than one headache each month.

     Usually a fever or some other illness may cause headaches. You may get a headache when you work too

hard. You may get a headache when you can't get enough sleep. You may get a headache when you exercise

on an empty stomach.

     If you have headaches often, you need to see a doctor.

( )1. A headache may show something wrong in your body.

( )2. We never have a headache in our life.

( )3. A fever may cause headaches.

( )4. You may get a headache when you are hungry.

( )5. As soon as you have a headache, you need to see a doctor at once.