甲状旁腺手术后应注意哪些并发症（） A.出血 B.低钙血症 C.高钙血症 D.喉痉挛

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       Experts say that students usually need eight to ten hours' sleep at night , but more Chinese students

do not get enough sleep. Some Chinese parents are usually glad to see their children studying late. They

will think their children work very hard. But not all parents are happy about this. Once a mother told us

that every morning her 10-year-old boy put up one finger with his eyes still closed ,begging(央求) for

one more minute to sleep . Like thousands of student "early birds" in China, he has to get up before six

every morning.

       A report shows that a good night's sleep , students seem to be weaker than they should be. Many

students have fallen asleep during class at one time or another. Too much homework is not the only reason why students stay up late . Some watch TV or play the computer games late into the night.

       Experts have ever said that students should develop good study habits. So some clever students

never study late, they are able to work well in class.

1. The 10-year-old boy begged for one more minute to sleep because_____.

A. he didn't have enough sleep  

B. it wasn't time for him to get up

C. he didn't want to go to school

D. he wanted his mother to wake him up

2. In this passage "early birds" means persons who ______.

A. get up early  

B. get up late    

C. sleep less    

D. don't want to sleep

3. From the passage we know if students don't get enough sleep, they may ______.

A. become too weak to sleep  

B. not work well in class

C. go to bed early        

D. be weak in English

4. "Stay up late "here means _____.

A. study late                   

B. watch TV late

C. not go to bed until late        

D. stay outside

5. According to the passage , which of the following is right ?

A. If you want to study better, you must work hard

B. Sleeping less means working hard

C. Some clever students can work well in class because they have good study habits.

D. Students don't have enough sleep only because they have a lot of homework to do.

The world is changing fast.I strongly believe that one will easily fall behind _______ he keeps on learning.

A．unless

B．if

C．when

D．as

以下属于公共卫生工作特有的伦理原则是（）。

A.生命价值原则

B.尊重自主原则

C.最优化原则

D.隐私保密原则

E.公众参与原则

聚星障有哪些临床表现？

φ4是指起重机的（）。