How long have you______?[ ] A. married B

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.

简述活性炭的再生方法。

肺在酸碱平衡调节作用中的最大代偿时限为（）

A.12～24小时

B.48～72小时

C.3～5天

D.7～9天

E.3～6小时

简述采购工作的主要任务。

正常人体运动功能发育顺序最早的为

A．四肢远端
B．头颈部
C．四肢近端
D．各部分无区别
E．躯干