(本小题满分10分)
在平面直角坐标系xOy中，点A(－1,－2)、B(2,3)、C(－2,－1).
(1)求以线段AB、AC为邻边的平行四边形两条对角线的长；
(2)设实数t满足()·=0，求t的值.

You have often __1__ people talk about work. Perhaps you have __2__ your friends about how hard you worked to get something done. However, you may have done no work __3_ you think you worked hard.
A boy is pushing a big box very hard, but the box is __4__ heavy for him to move and he may __5__ to push against the box. __6__ the language of science, he has not done __7__ work. Can you think you are working when you are studying or talking?
In science, work is only done when a force(力) moves something that has weight through a distance（距离）.
Work =" force" × distance moved.
__8_ you want to find out whether work is done, _9_ yourself, “Is a push or a pull moving something through a distance?” If your answer is __10_, then work is being done.

【小题1】

A．asked B．wanted C．listened D．heard

【小题2】

A．said B．told C．talked D．spoken

【小题3】

A．though B．so that C．while D．because

【小题4】

A．very B．so C．too D．such

【小题5】

A．be afraid B．be sure C．not like D．like

【小题6】

A．In B．With C．As D．For

【小题7】

A．a B．no C．some D．any

【小题8】

A．If B．After C．While D．As soon as

【小题9】

A．to ask B．just ask C．only think D．to think

【小题10】

A．“Right” B．“Good” C．“Well” D．“Yes”

Three travelers, Allan, Carl and Paul were sitting on the chairs in a train station. They were waiting for a train that was very late.
To pass the time, they began talking to each other.
At first, they talked about the weather and their work. Then Paul said, "Tell me—what would you most like to do if your doctor tell you that you have only three months to live?"
The other two men thought about this for a while, then Carl spoke.
“Well,” he said, “if I have only three months to live, I’ll take all my money out of the bank and go to foreign countries for holidays with my best friend, Erik. I'd like to travel to the places in the world as many as possible. And I'll stay at the best hotels and then eat the best food. I think I'll have a wonderful time.”
“That's very interesting.” Paul said.
With these words, he turned to the other man, saying, “And what about you?”
“I'll tell you a secret,” Allan said. “I always want to be a racing driver. So if I have only three months to live, the first thing I'd like to do is to sell my house. With the money I’ll buy the fastest car in the world. Maybe I can enter all the big motor races.”
Then he laughed, "I might even end up (以……而告终) world champion.”
“Now it's your turn,” Allan went on, “If your doctor tell you the bad news, what would you most like to do?”
“Oh,” said Paul with a smile. “I’ll go and see another doctor.”
【小题1】The three men were talking _____________.

A．in the post office	B．in the waiting room
C．on the train	D．on the chairs

【小题2】The man called ________ answered the question first.

A．Carl

B．Allan

C．Erik

D．Paul

【小题3】The men began to talk about the weather and the work because they __________.

A．didn't know anything new

B．wanted to pass the time quickly

C．had nothing to do

D．were very interested in each other's work

【小题4】"I might even end up world champion." Here the word "champion" means ___in Chinese.

A．名人

B．赛车手

C．大款

D．冠军

【小题5】Which sentence is right according to the passage?

A．The train didn't arrive on time.

B．Paul wanted to buy a racing car very much.

C．Allan was the second man to answer the question.

D．Carl didn't like traveling at all.

Three travelers, Allan, Carl and Paul were sitting on the chairs in a train station. They were waiting for a train that was very late.
To pass the time, they began talking to each other.
At first, they talked about the weather and their work. Then Paul said, "Tell me—what would you most like to do if your doctor tell you that you have only three months to live?"
The other two men thought about this for a while, then Carl spoke.
“Well,” he said, “if I have only three months to live, I’ll take all my money out of the bank and go to foreign countries for holidays with my best friend, Erik. I’d like to travel to the places in the world as many as possible. And I’ll stay at the best hotels and then eat the best food. I think I’ll have a wonderful time.”
“That’s very interesting,” Paul said.
With these words, he turned to the other man, saying, “And what about you?”
“I’ll tell you a secret,” Allan said. “I always want to be a racing driver. So if I have only three months to live, the first thing I’d like to do is to sell my house. With the money I’ll buy the fastest car in the world. Maybe I can enter all the big motor races.”
Then he laughed, “I might even end up (以……而告终) world champion.”
“Now it’s your turn,” Allan went on, “If your doctor tell you the bad news, what would you most like to do?”
“Oh,” said Paul with a smile. “I’ll go and see another doctor.”
【小题1】The three men were talking ________.

A．in the post office	B．in the waiting room
C．on the train	D．on the chairs

【小题2】The man called ________ answered the question first.

A．Carl

B．Allan

C．Erik

D．Paul

【小题3】The men began to talk about the weather and the work because they ________.

A．didn’t know anything new

B．wanted to pass the time quickly

C．had nothing to do

D．were very interested in each other’s work

【小题4】“I might even end up world champion.” Here the word “champion” means _______in Chinese.

A．名人

B．赛车手

C．大款

D．冠军

【小题5】Which sentence is right according to the passage?

A．The train didn’t arrive on time.

B．Paul wanted to buy a racing car very much.

C．Allan was the second man to answer the question.

D．Carl didn’t like traveling at all.

A young father was visiting an old neighbor. They were standing in the old man’s garden, and talking about children. The young man said,“How strict should parents be with their children?”
　  The old man pointed to（指着）a string (细绳) between a big strong tree and a thin young one.
　 “Please untie (解开) that string.” said the old man. “But first pull the string tight so that（以便于）the young tree is straight again.” The young man did so. He untied the string and only found that the young tree bent（弯）over to one side.
　 Then the old man said,“There, it is the same with children. You must be strict with them. But sometimes you must untie the string to see how they are getting on. If they are not yet able to stand alone，you must tie the string tight again. But when you find that they are ready to stand alone，you can take the string away.”
【小题1】The story is about ____________.
　　    A. how to take care of young trees　   
B. how strict parents should be with their children
C. how the young father should get on with his old neighbor
【小题2】 The young man untied the string ________________.
　　    A. in order to throw it away  　　
B. so that both of the trees wouldn’t grow straight
　　    C. and found that the young tree bent over to one side
【小题3】When could the string be taken away?
　　    A. When the old man left.　  　　
B. When the young man untied it next time.
　   　C. When the young tree grew strong enough.
【小题4】 At last the old man told the young man ________________.
　　    A. that he should be strict with his children if they could not 
stand alone
　　    B. that he should always be strict with his children
　　   C. that he should be hard on his children
【小题5】We learn that the big strong tree and the thin young one are like _________.
A. the young father and the old neighbor   　　
B. parents and their children
　　     C. the old neighbor and the children of young father