题目

如图4-1-10所示，置于空气中的厚玻璃板，AB、CD分别是玻璃板的上、下表面，且AB∥CD.光线经AB表面射向玻璃砖，折射光线射到CD表面时，下列说法正确的是（    ） 图4-1-10 A.不可能发生全反射 B.有可能发生全反射 C.只要入射角i足够大就能发生全反射 D.不知玻璃折射率，无法判断 答案：A 解析:由折射定律和全反射条件知，光线由AB射入玻璃板不发生全反射现象，玻璃板中的折射光线射到CD面上时，将有和原入射光线平行的光线射出，即不会发生全反射现象. 第四节 完形填空 （共20 小题，每小题1.5分，满分30分） 阅读下列短文，掌握其大意，然后从各题所给的四个选项中，选出最佳选项。 The story goes that some time ago, a man had a very lovely little daughter. One day the man  26  his 3-year-old daughter for  27  a roll of gold wrapping paper. Money was tight and he became  28  when the child tried to decorate a  29  to put under the Christmas tree.  30  , the little girl brought the gift to her  31  the next morning and said, “This is for you, Daddy.” The man was  32  by his earlier  33  , but his anger flared again when he found out the box was  34 . He yelled at her, “Don’t you know, when you give someone a present, there is  35  to be something inside?” The little girl looked  36  at him with tears in her eyes and cried, “Oh, Daddy, it’s not empty at all. I  37  kisses into the box. They are all for you, Daddy.” The father was crushed. He  38  his arms around his little girl, and he begged for her  39 . Only a short time later, an  40  took the life of the child. It is also told that her father  41  that gold box by his bed for many years and whenever he was discouraged, he would take out a(n)  42  kiss and remember the love of the child who had put it there.        In a very real sense, each of us, as human beings, has been given a gold container  43  unconditional love and kisses from our children, family members, friends, and God. There is simply no other  44  , which anyone could hold, more  45  than this. 26. A. asked    B. praised       C. begged       D. punished 27. A. wasting B. stealing      C. selling D. holding 28. A. glad     B. angry  C. sad     D. upset  29. A. room    B. hall     C. box     D. ball 30. A. Nevertheless B. But     C. Therefore   D. And 31. A. father   B. mother       C. teacher       D. sister 32. A. puzzled B. surprised    C. scared D. embarrassed 33. A. overwork     B. overreaction          C. overcoat     D. overpass  34. A. empty   B. heavy  C. full     D. wet  35. A. happened     B. seemed               C. supposed    D. used 36. A. down    B. back   C. up      D. forward  37. A. blew     B. sent    C. set      D. passed  38. A. put       B. turned C. handed       D. gave  39. A. kindness      B. forgiveness    C. sadness       D. carelessness 40. A. overview     B. incident              C. accident     D. action  41. A. remembered B. owned C. had     D. kept 42. A. imaginary      B. kind    C. gentle D. warm 43. A. filled with    B. pleased with      C. crowded with            D. equipped with 44. A. world   B. feeling       C. possession  D. love 45. A. expensive         B. precious        C. comfortable       D. interesting