题目

（12分）如图，已知抛物线C：，为其准线，过其对称轴上一点P 作直线与抛物线交于A、B两点，连结OA、OB并延长AO、BO分别交于点M、N。（1）求的值; （2）记点Q是点P关于原点的对称点， 设P分有向线段所成的比为， 且 求证：  答案：（1）-1 解析:（1）证明：设由     则                                         完形填空。      It's only after three weeks into a new job that I made a serious mistake. My boss called it "extremely embarrassing" in a company-wide e-mail - which,    1   , he wrote because he felt he needed to explain that what I did was something    2   in the company should ever do.     I wish I   3  give a good excuse for what I did. At the very least, I wish I could explain it somehow -    4  it on youth, inexperience or ignorance. Unfortunately, I'm    5   , experienced and I know better.         6   I work with some very kind and compassionate(富于同情心的) people. For the past couple of days many of them have taken time to   7   by my desk and offer comfort, encouragement and support. Some have shared with me similar    8   they have made. Evidently I'm not the only "    9   " person here.     One of the exchanges I had this week was with Lois, the much-honored, much-respected professional who    10   the desk right next to mine. Lois was completely    11   about her work, and to be honest I was a little nervous about how she would   12   to such an extremely embarrassing incident.     As I expected , Lois didn't pass over the   13   when she saw me the next day. She mentioned it directly,   14   with empathetic consideration. She listened to my   15   . Just as I was ready to express my regrets, she brought my self-pity partly to a(n)   16   .     "It happened", she said, "There's nothing you can do to    17   that. It happened. But it's over now. It's   18   . It's in the past. You need to let it go, and move on." And with that she returned her   19   to her work, as if to say, "We're done here."      I beat myself up for weeks. At such times I need to remember those   20   words: It's over. It's done. Let it go. And mostly, move on. (     )1.  A. by the way(     )2. A. someone(     )3. A. should(     )4. A. fix  (     )5. A. outgoing(     )6. A. Thankfully(     )7. A. work  (     )8. A. decisions(     )9. A. annoying(     )10. A. repairs(     )11. A. mad  (     )12. A. react(     )13. A. issue(     )14. A. for  (     )15. A. challenge(     )16. A. order(     )17. A. forget(     )18. A. broken(     )19. A. attention(     )20. A. sweet B. in the wayB. anyone  B. mightB. blameB. old  B. NaturallyB. stop  B. troublesB. confusingB. wantsB. seriousB. agreeB. outcomeB. thereforeB. imaginationB. key  B. ruin  B. done  B. skillB. pleasant C. on the wayC. no one    C. will         C. rely         C. cheerful      C. Generally    C. watch       C. attempts     C. embarrassing  C. works       C. curious      C. turn         C. criterion     C.but      C. conclusion    C. end           C. prevent      C. lost         C. patience     C. meaningful   D. to the way    D. the one       D. could         D. put           D. energetic     D. Hopefully     D. sit           D. mistakes      D. puzzling      D. occupies      D. hopeful       D. object        D. message       D. otherwise     D. explanation   D. process       D. change        D. kept          D. interest      D. colorful