计算机网络拓扑通过网络中节点与通信线路之间的几何关系来表示A．网络层次 B．协议关系

阅读理解。

     I usually get up at 5:00. I make coffee, go to my desk and work. When my boys get up, I'm theirs. I

follow the min to the kitchen and make them breakfast. While they're eating, I make their lunch, pick out

their school clothes and get the little one dressed.

     My wife takes them to school. I bring them home. I am not the only father at the school gate. The boys

and I walk the 12 blocks home unless the weather is terrible. Then we take the subway. I remind them of

looking out, like an animal looking after their babies.

     At home, they play on the computer and the little one will draw, sometimes for hours. When their mother

comes home, they run to her. She has been in the official day and tired, but her attention is all on them.

     I have made dinner. We sit down and eat together. After they do their homework, Karen takes them to

bed. I listen to the noise of the boys' and their mother's voice.

     One afternoon when we were on the way home from school, the boys and I stopped at the clothing store.

The saleswoman looked at the boys and said to me in a low voice, "You're Mr. Mom, aren't you?" I felt very

angry. I'm not Mr. Mom. That's not how I look at myself. The boys have a mother, a wonderful mother.

She works outside the home, I work in the home. We are parents together. I'm a father!

1. The first paragraph talks about _________.

A. what the children have for breakfast

B. how busy the man is in the morning

C. why the man cooks lunch

D. when the children go to school

2. We know from the second paragraph that _________.

A. they take the subway to school when the weather is bad

B. the man drives a car and his wife walks to work

C. the man goes to meet the boys before school is over

D. it doesn't take them long to arrive home

3. Paragraph 3 tells us that _________.

A. the children's mother is very strict with them

B. the man's wife works in an office very near the school

C. the children's mother used to be back hours later than them.

D. the man has three or more children and the youngest loves drawing

4. We learn from the last two paragraphs _________.

A. what the saleswoman said has hurt the man a lot

B. before the children get to sleep, the man's wife tells stories

C. what the man hast o do from morning to night everyday

D. the man's wife is Karen and she talks a lot

5. This passage tells us _________.

A. never to call a man Mr. Mom

B. the man doesn't enjoy working at home

C. something about the children's school life

D. what kind of people the man and his wife are

在2004年雅典奥运会上，我国运动员刘翔奋力拼搏，勇夺男子110m跨栏冠军，成为新的世界飞人．图甲为刘翔奔跑途中后脚蹬地的瞬间，图乙为刘翔奔跑途中前脚着地的瞬间，用f₁、f ₂分别表示刘翔在图甲、乙两瞬间所受到的摩擦力，则关于f ₁、f ₂的方向，以下说法正确的是（　　）

A．f ₁向前，f ₂向后

B．f ₁向前，f ₂向前

C．f ₁向后，f ₂向后

D．f ₁向后，f ₂向前

下列基本操作正确的是 [ ]

A．手持试管给试管里的物质加热

B．用燃着的酒精灯去点燃另一盏酒精灯

C．用天平称取药品时用手直接拿砝码

D．用滴管滴加液体时，滴管应垂悬在容器上方，不能触及容器内壁

在双代号网络计划中，关键线路是( )。

A．所有线路中线路上各项工作持续时间之和最小的线路

B．线路上各项工作的总时差均为零的线路

C．线路上各项工作的自由时差均为零的线路

D．线路上各项工作的最迟开始时间与最早开始时间相等的线路

E．线路上各项工作的持续时间均不可压缩的线路

被行政拘留人在被行政拘留前因同一行为被依法（）的，应当折抵行政拘留时间。

A、刑事拘留

B、逮捕

C、取保候审

D、监视居住