题目

一种商品价格的变化会引起与该商品相关联商品的需求量的变化。下列图示（Py表示Y商品的价格，Qx表示X商品的需求）对商品关联性的标注正确的是 答案：A 完形填空      One summer in college, I was invited to be an instructor at a high school leadership camp.     I first   1  a boy under the tree on the first day of camp. His obvious   2   and shyness made him appear weak and lonely. Nearby, 200   3   campers were playing and joking, but the boy seemed to want to be anywhere   4   where he was.     I was instructed to care more about campers who might feel   5  . So I   6   him and said, "Hi, I'm Kevin. It's nice to meet you. How are you?"       7   a shaky voice he   8   answered, "Okay, I guess."     I calmly asked him to join in the activities and   9   some new people. He quietly replied, "No, this is not really my thing."     I could   10   that this whole experience was   11   to him. But I somehow knew it wouldn't be right to   12   him, either. It was going to take more time and   13  .     The next day, I was leading camp songs for the campers. They eagerly participated. But the boy was just sitting alone,   14   out the window.      That evening at our nightly staff meeting, I made my   50   about him known. I asked them to pay special attention and spend time with him   51   they could.     The days flew by fast. When the "last dance" came, surprisingly, the boy from under the tree was now a shirtless dancing   52  . He owned the dance floor   53   meaningful time with others. I couldn't' believe it was him.     In that instant, I realized how easy it is to give a bit of   54   every day. You may never know how much each gesture may mean to someone else. I tell this story as   55   as I can, and I advise others to look out for their own "boy under the tree." (     )1. A. noticed     (     )2. A. anger       (     )3. A. ambitious   (     )4. A. or rather   (     )5. A. left out     (     )6. A. passed      (     )7. A. At           (     )8. A. unfortunately (     )9. A. meet         (     )10. A. consider   (     )11. A. familiar   (     )12. A. push       (     )13. A. effects     (     )14. A. observing   (     )15. A. concern     (     )16. A. unless     (     )17. A. wonder     (     )18. A. sparing     (     )19. A. himself     (     )20. A. often       B. recognized B. discomfort B. curious   B. just as   B. put out   B. left       B. By         B. unwillingly B. interview B. suggest   B. strange   B. pull       B. exercises B. staring   B. trouble   B. before     B. danger     B. saving     B. yourself   B. far       C. learned    C. excitement  C. anxious    C. other than  C. made out    C. approached  C. On          C. unconsciouslyC. find        C. sense      C. similar    C. pardon      C. expenses    C. admiring    C. devotion    C. when        C. scene      C. spreading  C. themselves  C. soon         D. heard           D. satisfaction    D. eager           D. as well as      D. let out         D. visited         D. In              D. uninterestingly D. help            D. prove           D. typical         D. punish          D. efforts         D. examining       D. understanding   D. since           D. instructor      D. sharing         D. itself          D. long