题目

已知点P(x，y)在经过A(3,0)，B(1,1)两点的直线上，则2x＋4y的最小值为        答案：  4    阅读理解。                                                           A Birthday Present      Susan has three dollars-the pocket money (零用钱) she had saved up. She wanted to buy a birthdaypresent for her father. She came to a big shop. She looked at the goods in a shop window and thought, "I should give him something to wear."      "Can I help you, little girl?" said the shopkeeper, Mr King. "Yes, please. I'm looking for a present for mydad," said Susan, "but I don't know what to buy. "Mr King showed her a nice shirt and said, "What about this?""No, I have only three dollars," said Susan. Then she saw a beautiful white tie. She knew her father would likeit. She wanted to get it, but it might be very dear,she was afraid.      "How much is it?" She asked. Mr King looked at her for a while and then he took off the price tag and said, "That's just three dollars." "Oh, fine!" Susan said happily, "I'll take it." 1. Susan wanted to buy _________. A. something to wear B. a skirt C. a shirt D. a present for her dad 2. How much money did Susan have? A. About 3 dollars. B. Less than 3 dollars. C. More than 3 dollars.D. Only 3 dollars. 3. Mr King is _________. A. the salesman B. the shopkeeperC. a friend D. a neighbour 4. At last, Susan bought _________. A. a shirt B. a pair of shoes C. a tieD. a tag 5. From the story we know that Mr King is a _________ man. A. kind B. bad C. tall D. fat