公文产生的必要条件是什么？

礼步用于纪念仪式中礼兵的行进，听到动令，左脚向正前方缓慢抬起，按照脚跟、脚掌顺序缓慢着地，步幅约（）厘米，右脚照此法动作。

A、55

B、65

C、75

D、85

阅读理解。

     "I don't like my parents. They always tell me I should do this, and should not do that. It

sometimes makes me angry." said Zhang Hua,a middle school student in Guangzhou. Do you have

the same problem? Perhaps your parents had the same problem when they were your age long ago.

Why does it seem that some parents are not so friendly in their children's eyes?

     One of the biggest things is when someone becomes a parent,he or she likes worrying things.

They worry about everything about you from the time you were born. They do a lot for you, though

something would make you angry,because they care about you and worry about you. They worry

about the friends you choose, the food you eat, your work at school, how much sleep you get, etc.

All these things are part of your life. They want you to grow up healthily and happily.

     So how can you make things easier on yourself? It's easier than you think. Just make sure

your parents know what you're doing. Let them know your friends. Call them if you stay somewhere

else. Say sorry to them when you make mistakes. Take responsibility (责任) for what you have

done. Talk about your ideas with them. They may talk about theirs with you.

     Most of all,try to think about why your parents do this or do that. They are still practicing being

parents and need your help. Someday, when you become a parent, they may be able to help you

how to get on with your children.

1. The writer thinks we should _____ if we go back home later than usual.

A. tell our friends

B. say sorry to our parents

C. make a telephone to our parents

2. Why doesn't Zhang Hua like his parents?

A. Because they are unfriendly.

B. Because they argued with him.

C. Because he didn't understand them.

3. The writer thinks _____.

A. it's wrong of parents to worry about their children too much

B. some parents are unfriendly, which makes their children angry

C. parents love their children and the children should understand them

4. Why do parents worry about everything about you?

A. They think you too young.

B. They want you to grow up healthily and happily.

C. They want to make you unhappy.

5. Which is the best title for the passage?

A. Parents' Responsibility

B. How to Get on with Parents

C. Zhang Hua's Problem

股票市场的首要功能是( )。

A．优化资源配置

B．转换机制

C．筹集资金

D．分散风险

十碳的饱和脂肪酸经β氧化分解为5mol乙酰CoA，同时可形成（）

A.14molATP

B.16molATP

C.20molATP

D.79molATP

E.80molATP

根据《现役军官职务任免条例》规定要求，支队级单位正营职干部的任免，应由（）提出任免意见。

A.基层大队党委

B.支队政治处

C.总队政治部

D.支队党委