二叉排序树

具有消化道症状、症状波动、运动障碍和精神症状等副作用（）。

A.司来吉兰

B.金刚烷胺

C.复方左旋多巴

D.溴隐亭

E.神经节苷脂

阅读理解

     A Brown University sleep researcher has some advice for people who run high schools : Don't start

classes so early in the morning. It may not be that the students who nod off at their desks are lazy. And

it may not be that their parents have failed to enforce (确保) bedtime. Instead, it may be that biologically

these sleepyhead students aren't used to the early hour.

     " Maybe these kids are being asked to rise at the wrong time for their bodies, " says Mary Carskadon,

a professor looking at problems of adolescent  (青春期的) sleep at Brown's School of Medicine.

     Carskadon is trying to understand more about the effects of early school time in adolescents. And , at

a more basic level, she and her team are trying to learn more about how the biological changes of

adolescence affect sleep needs and patterns.

     Carskadon says her work suggests that adolescents may need more sleep than they did at childhood ,

no less,as commonly thought.

     Sleep patterns change during adolescence, as any parent of an adolescent can prove. Most

adolescents prefer to stay up later at night and sleep later in the morning. But it's not just a matter of choice-their bodies are going through a change of sleep patterns.

     All of this makes the transfer from middle school to high school-which may start one hour earlier in

the morning-all the more difficult , Carskadon says. With their increased need for sleep and their

biological clocks set on the "sleep late , rise late"  pattern, adolescents are up against difficulties when it

comes to trying to be up by 5 0r 6 a. m. for a 7 : 30 a. m. first bell. A short sleep on a desktop may be

their bodies' way of saying,"l need a timeout. "

1. Carskadon suggests that high schools should not start classes so early in the morning because_______.

A. it is really tough for parents to enforce bedtime

B. it is biologically difficult for students to rise early

C. students work so late at night that they can't get up early

D. students are so lazy that they don't like to go to school early

2. The underlined phrase " nod off"  ( Paragraph l) most probably means"__________".

A. turn around                    

B. agree with others

C. fall asleep                      

D. refuse to work

3. What might be a reason for the hard transfer from middle school to high school? __________

A. Adolescents depend more on their parents.

B. Adolescents have to choose their sleep patterns.

C. Adolescents sleep better than they did at childhood.

D. Adolescents need more sleep than they used to.

4. What is the text mainly about? _________

A. Adolescent heath care.

B. Problems in adolescent learning.

C. Adolescent sleep difficulties.

D. Changes in adolescent sleep needs and patterns.

下面的接地方法哪个正确的（）

A、基站中采用独立接地方式。

B、从馈线接头到母地线由一根16平方毫米的地线连接，而且要顺着地线排的方向连接。

C、采用铁塔时，馈线接地点应在下楼台转弯前1.5米处.且一根馈线一个接地点。

D、从机房所在楼房的地网单独拉一根截面积大于35平方毫米的总地线进机房，接到机房的室内地线排上。

未办理工商营业登记的，从事生产经营的纳税人可以暂不办理税务登记。（）

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