题目

关于条形磁铁周围的磁感线，下列说法正确的是A. 条形磁铁两端附近磁感线可以相交B. 越接近条形磁铁两端，磁感线越密集C. 离条形磁铁较远的地方，磁感线是断开的D. 磁感线是真实存在的曲线 答案：【答案】B【解析】条形磁铁两端附近磁感线不可能相交，故A错误；条形磁铁两端的磁感线的分布较密，该处的磁场较强，故B正确；磁感线是闭合曲线，故C错误；磁感线是为了形象的描述磁场引入的假想的曲线，不是实际存在的；故D错误； 第二节  完形填空(共20小题;每小题1.5分,满分30分) 阅读下面短文, 掌握其大意, 然后从36~55各题所给的A、B、C、D四个选项中,选出最佳选项。 When I was young, my grandmother used to tell me stories. I’d like to  36  with you one of my favorites. Once, there was a young boy. He was very  37  because he couldn’t keep his friends. He asked his father  38  this was so. His father  39  replied, “Son, each time you say or do something that  40  one of your friends, hammer a piece of wood into the  41  .” The curious boy did  42  he was told and soon he made fence(篱笆)  out of the wood. “Father!” he cried, “I can’t get out! I am blocked by this fence!” “Well, Son, each time you say something  43  to a friend, you can take one piece of wood out.” The boy  44  this, too. On the first day he took out one piece of wood and on the second day he took out  45  two. On the third day he took out  46  more. Finally he had  47  all of the wood. “But Father!” he cried again, “Look at the  48  in the ground! They are big and dark! Oh, how ugly!” “Son,” his father said, “this is why you aren’t able to  49  your friends. Remember: when you hurt someone’s feeling, no matter what you do to  50  for it, there will always be a scar(伤痕) in his  51  .” From that day on, the boy was very  52  of his words and actions and he  53  hurt his friends’ feelings again. I always keep this story close to my heart. It has  54  me lot. I am always careful not to hurt any of my friends because they are people that I wouldn’t want to  55  . 36. A. argue                  B. discuss                C. share                 D. compare 37. A. happy            B. upset               C. friendly               D. frightened 38. A. what             B. how                 C. when                 D. why 39. A. just              B. hardly                C. also                   D. once 40. A. leaves            B. pleases                C. hurts                 D. amuses 41. A. wall              B. ground               C. field                 D. door 42. A. that               B. which               C. when                D. as 43. A. surprising       B. interesting                  C. nice                    D. bad 44. A. did               B. made                 C. refused               D. said 45. A. other             B. another              C. the other              D. others 46. A. few               B. some                 C. any                  D. no 47. A. removed        B. repeated              C. replanted              D. recycled 48. A. sand              B. dirt                    C. holes                    D. sticks 49. A. make              B. meet                   C. keep                    D. stay 50. A. turn up          B. take up                C. bring up               D. make up 51. A. heart              B. face                    C. neck                   D. hand 52. A. afraid            B. careful                C. proud             D. fond 53. A. always                  B. ever                     C. never                         D. already 54. A. found            B. taught             C. lent                     D. saved 55. A. avoid                   B. admire                C. respect                D. lose