已知命题p：“∀x∈[1，2]，x2-a≥0”，命题q：“∃x0∈R，x02+2 发布时间：2017-04-06 19:17 │ 来源：www.tikuol.com 题型：解答题 问题： 已知命题p：“∀x∈[1，2]，x2-a≥0”，命题q：“∃x0∈R，x02+2ax0+2-a=0”，若命题“p且q”是真命题，求实数a的取值范围．
题型：解答题 完形填空。 Two years ago, Martin was a "problem child" and he often caused a lot of 1 . But he didn't usually givehis mother much trouble. However, after his father's death, Martin's life became much more 2 . His motherdidn't have enough money to 3 for his education. To do this, she had to work hard, and so she was not often 4 with him. His mother looked after him as 5 as she could, but Martin still caused problems. He was interestedin 6 and he was often in trouble with the police. Luckily, his mother was very patient (有耐心的), and didn't give up trying to help him. In the 7 , she made a difficult decision: to send him to a boy's boardingschool (寄宿学校). But Martin 8 it very much. One day, he told his headteacher he wanted to leave the 9 . The headteacher said it was necessary for Martin to talk with his 10 . So Martin called his mother. To his surprise, this phone call changed his life." 11 was really what I needed," he said later. "My mother helped me to understand how much she had given me. She also told me that my father was watching me, 12 he had died, and he would always be proud of everything good I did. I realized that after my father died, I was 13 to be alone, and I tried to make my mother pay more attention (注意) to me." Martin has really changed. And he is now a 14 student in his class. How was he able to change? His mother's love helped 15 to feel good about himself. As Martin says it's very important for parents to bethere for their children. ( )1. A. fire ( )2. A. careful ( )3. A. pay ( )4. A. at home ( )5. A. fast ( )6. A. eating ( )7. A. end ( )8. A. improved ( )9. A. room ( )10. A. mother ( )11. A. I ( )12. A. if ( )13. A. nice ( )14. A. bad ( )15. A. it B. trouble B. beautiful B. ask B. at school B. well B. playing B. team B. liked B. library B. father B. It B. than B. glad B. good B. me C. water C. difficult C. look C. in trouble C. soon C. reading C. front C. hated C. street C. teacher C. He C. though C. afraid C. big C. her D. wood D. wonderful D. wait D. in hospital D. late D. studying D. school D. missed D. school D. headteacher D. One D. whether D. careful D. lazy D. him 查看答案