题目

如图所示，在水平面上固定着三个完全相同的木块，一子弹以水平初速度v射入木块，若子弹在木块中做匀减速运动，当穿透第三个木块时速度恰好为0，则子弹依次射入每个木块时的速度比和穿过每个木块所用时间比分别为（      ） A、      B、 C、    D、 答案：BD 解析: 略 Cloze test.      Mrs. Pillar was one of my second grade teachers. She was a great teacher. However, I will always remain grateful to her for what she did for me more than a decade later.      As a freshman in college, I was involved in a near fatal "  1  " when I walked into a robbery at a convenience store. One of the thieves   2   me in the head, pumping a bullet into my brain.      The thieves, as well as most people, thought that I was dead.   3  , they were wrong. However, it was a severe and difficult battle getting back into the mainstream of life. I had to   4   of college to be hospitalized. Even after I was discharged from the hospital, I   5   many hours of intensive therapy (治疗). I had to relearn practically everything, including walking, talking,   6   yes, math.     To help with that task, Mrs. Pillar volunteered to come to the hospital and later to my house once a week, to work with me. At first, the material that she presented appeared, to most people, to be very   7   math skills.Then, as time progressed, and I made   8  , my "homework" became progressively more difficult.     I remember very   9   how she would come to my home on Sundays, sit with me at kitchen table, and throw various coins on the table. She would ask me to show her 38 cents, 17 cents, 63 cents. It was  10  for me, but she also made it fun.      After a year and a half, I had progressed sufficiently, both  11  and mentally, to learn to college. Once there, I  12  therapy regularly, and four years later I graduated from the University of Texas at the top of myclass. Following that, I went to graduate school. (     )1.A. event       (     )2.A. patted      (     )3.A. Obviously     (     )4.A. wear our    (     )5.A. cost        (     )6.A. but         (     )7.A. basic       (     )8.A. decision  (     ) 9.A. vividly   (     )10.A. simple   (     )11.A. bodily     (     )12.A. stopped    B. accident       B. slapped       B. Generally     B. die out        B. took           B. and           B. advanced       B. choice        B. colorfully    B. interesting   B. physically    B. paused        C. affair            C. shot              C. Occasionally      C. give out          C. endured            C. or                C. unique             C. contribution     C. suddenly          C. fresh             C. psychologically   C. continued         D. business        D. hit             D. Namely         D. drop out       D. enjoyed         D. nor            D. complex                     D. progress       D. valuably      D. challenging    D. attitudinally  D. enhanced