已知：A（-5，0）、B（5，0），直线AM，BM交于M，且它们的斜率之积是-4

My teenage son Karl became withdraw after his father died. As a single parent, I tried to do my best to talk to him. But the more I tried, the more he pulled away. When his report card arrived during his junior year, it said that he had been absent(缺席) 95 times from classes and has six falling grades for the year. At this rate he would never graduate(毕业), I sent him to the school adviser, and I even begged(乞求) him. Nothing worked.

One night o felt so powerless that I got down on my knees(膝盖) and pleaded(恳求) for help. “Please God, I can’t do anything more for my son. I’m at the end of my rope(绳子). I’m giving the whole thing up to you.”

I was at work when I got a phone call. A man introduced himself as the headmaster. “I want to talk to you about Karl’s absences.” Before he could say another word, I choked up and all my disappointment and sadness over Karl came pouring out into the ears of this stranger. “I love my son but I just don’t know what to do. I’ve tried everything to get Karl to go back to school and nothing has worked. It’s out of my hands. “For a moment there was silence on the other end of the line. The headmaster seriously said, “Thank you for your time”, and hung up.

Karl’s next report card showed a marked improvement in his grades. Finally, he even made the honor roll .In his fourth year, I attended a parent-teacher meeting with Karl. I noticed that his teachers were astonished at the way he had turned himself around. On our way home, he said, “Mum, remember that call from the headmaster last year?” I nodded. “That was me. I thought I’d play a joke but when I heard what you said, it really hit me how much I was hurting you. That’s when I knew I had to make you proud.”

小题1: Which of the following has the similar meaning to the underlined word “withdrawn”?

A．Quiet and lonely.

B．Relaxed and excited.

C．Active and lively.

D．Happy and easy-going.小题2:When the mother said “It’s out of my hands” to the headmaster, she meant that she ______.

A．didn’t know what to do about her son

B．would drive her son away from the house

C．had no money to support the family

D．would have to hang up小题3:Who was it that telephoned Karl’s mother that day?

A．The headmaster

B．The school adviser

C．Karl himself

D．The passage doesn’t tell us小题4:From the passage we can learn that ______.

A．children in single-parent families always have mental problems

B．mother’s love plays an important role in teenagers’ life

C．parents should give their children everything that they need

D．school education still works well without the support from parents

一个转运RNA的一端三个碱基是CGA，此转运RNA运载的氨基酸是[ ]

A. 酪氨酸(UAC)

B. 谷氨酸(GAG)

C. 精氨酸(CGA)

D. 丙氨酸(GCU)

以下的说法正确的是

A．通式为C_nH_2n+2的有机物一定属于烷烃

B．通式为C_nH_2n的有机物一定属于烯烃

C．通式为C_nH_2n-2的有机物一定属于炔烃

D．通式为C_nH_2n-6（n≥6）的有机物一定属于芳香烃

阅读理解。

     Kathy started at my nursery school at the age of three. She settled into the group easily, and would be

first on the slide and highest up the climbing frame. She could put on her coat without help and not only

fasten her own buttons but other children's too.

     She was a lovely child but unfortunately a scratcher. If anyone upset her or stood in her way, her right

hand would flash out fast and scratch down the face of her playmates. Children twice her age would fly in

fear from her.

     This must have been very rewarding for Kathy but obviously it had to be stopped. All the usual ways

failed and then I remembered an account by G Atkinson Highfield School, of how fights in the playground

had been stopped. No punishment had been given, but the attacker had been ignored and the victims rewarded.

So I decided to try out on Kathy.

     With a pocketful of Smarties I followed Kathy around. She was so quick that it was impossible to prevent

her scratching, but I was determined to stay within arm's length all afternoon.

     All was peaceful but then I saw Kathy's hand moved and heard the scream. Gently I gathered up the little

hurt one in my arms and said "Nice, nice sweetie" and then looked puzzled when she got nothing.

     Soon came another scream, this time from John. While holding him in my arms, I said, "Look, Kathy, a

nice Smartie for John" and put it into John's mouth.

     A smile of understanding flashed across Kathy's face. Minutes later, she came to me and said loudly, "Give

me a Smartie! I have hurt my finger!"  

     "No," I replied, "you'll get it if someone hurts you."

     On purpose, she turned and scratched a nearby boy, Tom, and waited quietly while I mothered and

rewarded him, then she walked away. She has never scratched a child since.

     Parents who find older children bullying younger brothers and sisters might do well to replace shouting

and punishment by rewarding and giving more attention to the injured ones. It's certainly much easier and

more effective.

1. From the passage, we know that Kathy is ______.

A. sensitive but slow

B. smart but a bit rude

C. independent but selfish

D. quick but sort of passive.

2. Kathy scratched Tom because ______.

A. she was angry at Tom, who was in her way

B. she wanted to get a Smartie from the teacher

C. she was in the habit of scratching other children

D. she wanted to know if the teacher meant what she had said

3. According to the passage, the underlined word "bullying" is closest in meaning to "______".

A. helping

B. punishing

C. hurting

D. protecting

4. The writer of this passage aims to recommend an approach to ______.

A. rewarding children's good behavior

B. correcting children's bad behavior

C. punishing badly-behaved children

D. praising well-behaved children

道路交通标线按形态可分为( )。

A．线条

B．字符标记

C．突起路标

D．路边线轮廓标