题目

椭圆的一个焦点坐标为，且椭圆过点，则椭圆的离心率为________. 答案：【答案】【解析】由题意易得：，从而得到椭圆的离心率.由题意易得：，从而解得：，∴离心率e==故答案为： 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各题所给的四个选项（A、B、C和D）中选出最佳选项，并在答题卡上将该项涂黑。    You have been away from us for three years; you told us a lie which I came to know not long ago. On this special day for teachers across the country, I can   36    control myself from telling your white lie to those who would listen to me.    Do you still remember the happy    37     about six years ago? We fixed our eyes on you at your   38    .You, a beautiful young lady,    39     us that you would live in our village.    Soon after, we began to find you were part of your students and their simple honest parents. The villagers found their children    40     more time on their books    41    after doing their homework and housework. Yet they still    42      that one day you might leave. You    43      a smile all the time, which reduced to some degree their    44     of your leaving. You tried all your best in    45     your students, helping them not only in their studies but also in their money for school. You often put the importance to us the    46    of one’s life, so that must have been what you    47    after in those five years.    One cold morning when class began, you    48    the room as if you had been crying     49    .In your class, we    50     but looked away from your eyes. You    51     for some time as if you were     52     to find the right word. You said you would go away and would never be back to teach because your boyfriend wanted you more….    On the following morning, we    53     you the very best and the villagers gave you their    54     .The train took you away and your broken     55     .    On other day I heard my parents chatting that you had lung cancer and left the world. 36. A soon           B. seldom               C. hardly               D. forever 37. A.scene          B. sign                 C. silence                      D. situation 38. A.speech         B. arrival               C. existence              D. explanation 39. A.promised       B. came                C. proved                D. replied 40. A.paid           B. spent                C. made                 D. cost 41. A.even            B. never                C. long                  D. but 42. A.forbade          B. feared               C. made                  D. allowed 43. A.wore            B. gained               C. presented              D. pretended 44. A.trouble          B. puzzle              C. question               D. worry 45. A.teaching         B. field                C. middle                D. course 46. A.necessary         B. method              C. value                 D. reason 47. A.were            B. guessed             C. supposed              D. met 48. A.entered          B. arrived             C. left                   D. returned 49. A.friendly          B. bitterly            C. happily                D. angrily 50. A.listened          B. described           C. discussed               D. talked 51. A.laughed          B. stopped             C. explained              D. spoke 52. A.manage           B. beginning           C. come                   D. trying 53. A.expected         B. brought            C. wished                 D. hoped 54. A.thanks           B. rewards            C. expressions             D. satisfactions 55. A.class             B. memory            C. heart                  D. body