题目

完型填空（共20 小题；每小题1分；满分20分） She was a four-year-old girl with very fine golden hair when I first met her. She was carrying a bowl of soup. I was 29 at that time and   11   from the flu.    Her mom and I had been friends for years.   12   that friendship grew into care, from care into   13   and marriage. Marriage brought the three of us together as a   14  . At first I was afraid to be a “stepfather”. Therefore, I tried not to come   15   my future daughter and her   16   father. I acted in that way in order to be liked. However, �已知A={x|x3+3x2+2x＞0}，B={x|x2+ax+b≤0}且A∩B={x|0＜x≤2}，A∪B={x|x＞-2}，求a、b的值．