题目

如图所示，弹簧测力计与水平桌面平行，拉力从零逐渐增大，当拉力为16N时，木块不动；当拉力为35N时，木块恰好开始运动；当拉力为30N时，木块匀速运动．则木块受到的最大静摩擦力和滑动摩擦力分别是（） A . 30N、30N B . 30N、16N C . 35N、30N D . 30N、35N 答案：CI had walked along the sea for about an hour until I began to feel hungry. It was seven. At that time, I was not far away from a favourite restaurant of mine, where I often went to eat two or three times a week. I knew the owner well.I went into the restaurant, which was already crowded, and ordered my meat. While I was waiting, I looked 16   to see if I knew anyone in the restaurant. Then I saw a man sitting at a corner table near the doorkeeping looking in my   17   , as if he knew me. I certainly didn't know him, for I never forgot a face. The man had a newspaper open in front of him. But I could see that he was keeping an      18      on me. When the waiter brought my soup, the man was clearly puzzled by the familiar way that the waiter and I called each other. He became even more puzzled as      19     went on. He could see that I was well      20     in the restaurant. At last he got up and went into the kitchen. After a few minutes he came out again, paid for his meal and left.When I had finished, I called the owner of the restaurant over and asked him what the man had wanted. The owner told me he was a detective. "Really?" I was      21     . "He was certainly      22      in me. But why?" I asked. "He followed you because he thought you were a man he was looking for," the owner said. "When he came into the kitchen, he showed me a      23      of the man. He certainly looked like you! Of course, since we 24   you here, I told him that he had made a mistake." It was      25      I came to a restaurant where I was known, or I might have been arrested!(     )16. A. for     B. at      C. around   D. like(    )17. A. name    B. direction  C. attention  D. food(    )18. A orange    B. arm       C. apple      D. eye(    )19. A. programme   B. story     C. time     D. news(    )20. A. known   B. taken     C. made      D. brought(    )21. A. worried   B. surprised   C. surprising  D. sad (    )22. A. interested   B. interesting   C. worried     D. sure(    )23. A. book   B. photo      C. paper   D. magazine(    )24. A. see   B. know   C. hear      D. look at(     )25. A. bad   B. good  C. lucky     D. best