不是脑死亡的临床表现是（）。 A.有去大脑强直发作 B.自主呼吸丧失 C.对光反射消

阅读短文，选择正确答案。

     Do you get enough sleep? With so much homework it's often difficult to get the rest you need. But you need

to try, because sleep keeps you healthy and it stops you getting fat.

     Recently, a group of US scientists did a study (调查) of kids aged between8 and 13. The study found that if

kids sleep for just one extra (额外的) hour each day, the chance of their getting fat is cut by about 30 percent

(30%).

     Why? when people don't get enough sleep, they become tired. When they are tired, they don't exercise

enough. Also, kids like snacks. If they are awake (醒着的) an extra hour or two each day, they have more time

to eat snacks or other unhealthy foods.

     So, how much sleep should you get? Scientists suggest 10 to 11 hours a night for kids aged 5 to 12. For

older kids, eight to nine hours will do.

1. How many reasons are given why people might get fat without enough sleep? [ ]

A. 3

B. 2

C. 1

2. If you are under 10, how long do the scientists advice you to sleep? [ ]

A. 10 to 11 hours.

B. 8 to 9 hours.

C. 8 to 13 hours.

3. Where was the study done by the scientists? [ ]

A. In China.

B. In Britain.

C. In America.

4. What does "eight to nine hours will do" mean? [ ]

A. Eight to nine hour's sleep will be good and enough.

B. Eight to nine hour's sleep will be too long.

C. Eight to nine hour's sleep will help get fat.

5. What does the passage talk about? [ ]

A. How to get long sleep.

B. How to keep fat.

C. Enough sleep makes people healthy and slim. (苗条)

简述职位设置的四个操作阶段。

联合体各方应当签订( )的共同投标协议，明确各方拟承担的工作。

A．书面

B．口头

C．口头或者书面

D．任何形式

下列关于三叉神经的叙述错误的是（）

A.三叉神经属混合神经，含躯体感觉和躯体运动两种纤维

B.眼神经为感觉神经

C.上颌神经为感觉神经，穿眶上裂，为眶上神经

D.下颌神经为混合神经，经卵圆孔出颅分为数支

E.三叉神经周围突形成眼神经、上颌神经和下颌神经的大部分

在叶绿色素的提取和分离实验中，沿滤纸条扩散速度最快和最慢的色素依次（）

A.胡萝卜素和叶绿素b

B.叶黄素和叶绿素a

C.叶黄素和叶绿素b

D.胡萝卜素和叶绿素a