题目

一次函数y=kx+b的图象经过点A（0，9），并且与直线y=x相交于点B，与x轴相交于点C． （1）若点B的横坐标为3，求B点的坐标和k，b的值； （2）在y轴上是否存在这样的点P，使得以点P，B，A为顶点的三角形是等腰三角形？若存在，请直接写出点P坐标；若不存在，请说明理由． （3）在直线y=kx+b上是否存在点Q，使△OBQ的面积等于？若存在，请求出点Q的坐标；若不存在，请说明理由．阅读理解。     Do this and you'll be welcome anywhere.      Why read this book to find out how to win friends? Why not study the technique of the greatest winner of friends the world has ever known? Who is he? You may meet him coming down the street. When you get within ten feet of him, he will begin to wag its tail. If you stop and pat him, he'll jump out of his skin to show you how much he likes you. And you know this show of love. There is no secret motives (动机): he doesn't want to sell you any real estate(房产),and he doesn't want to be your husband or wife.       Did you ever stop to think that a dog is the only animal that doesn't have to work for a living? A hen has to lay eggs; a cow has to give milk; and a canary has to sing. But a dog makes a living by giving you nothing but love.      When I was five years old, my father bought a little yellow-haired young dog for fifty cents. He was the light and joy of my childhood. Every afternoon around four thirty, he would sit in the front yard with his beautiful eyes staring at the road, and as soon as he heard my voice or saw me through the bush, he was off like a shot, racing breathlessly up the hill to greet me with leaps of joy and barks of cheer.      Tippy was my good companion (同伴) for five years. Then one night-I shall never forget it -he was killed within ten feet of my head, killed by lightning. Tippy's death was the terrible event of my childhood. You never read a book on psychology (心理学), Tippy. You didn't need to.      You know that one can make more friends in months by really interested in other people than one can in two years by trying to get other people interested in him. Let me repeat that. You can make more friends in two months by becoming interested in other people than you can in two years by trying to get other people interested in you. 1. When the writer writes"the greatest winner of friends the world has ever known", he refers to _____. A. himself B. Tippy C. a pet dog D. a psychology book 2. The writer takes Tippy as a good example to ______.  A. explain how to win love from others B. show how he liked his friend C. tell the readers why they should read the book D. show us how a pet dog should behave 3. According to the writer, to be welcome anywhere, you must ______. A. know much about others' feelings B. do everything without secret motives C. satisfy the needs of different people D. show care and love for others4. Generally speaking, in what manner is the passage written?A. Light B. Serious C. Sad D. Disappointed