题型：问答题 简答题 完形填空。 Last weekends, my kids along with a few other kids from the neighborhood volunteered to help me wash my car. My 10-year-old daughter came up with the idea of 1 other people's cars as well. It was pretty 2 outside and I had no plans to 3 be ing in the bright sun. She 4 wanted to give lemonade (柠檬汽水) to passers-by for free. I had seen little kids 5 and sell fresh lemonade for a small cost but not free. Although I felt 6 , I decided to help her. 7 she asked me,"What if we 8 this a smile car wash?"I couldn't hold back my tears and 9 her and the other kids to go outside the house and come up with 10 ideas. While I kept myself busy in drying the car, the gang walked up to me with a(n) 11 with beautiful images of smiles. They had " Free Car Wash" written on it and the 12 of their exercise was"smile".It was pretty neat to see a team of kids ranging 5-11 years with the 13 to do something for others. All that seemed 14 and came right from their heart. Noth ing seemed to 15 to them: their playtime, the heat outside-they just wanted to 16 others and do something nice in the community! I helped them make some fresh lemonade and brought out some additional 17 to help clean cars. Passers-by were 18 and one even shouted back to them saying"God bless you, my kids..."One of them even tried giving them a 5 dollars, which they refused. A pretty heartwarming 19 ! I feel blessed by being 20 by such wonderful and loving souls. ( )1. A. drying ( )2. A. quiet ( )3. A. suggest ( )4. A. further ( )5. A. choose ( )6. A. worried ( )7. A. Finally ( )8. A. show ( )9. A. challenged ( )10. A. creative ( )11. A. board ( )12. A. purpose ( )13. A. need ( )14. A. important ( )15. A. matter ( )16. A. relax ( )17. A. friends ( )18. A. interested( )19. A. scene ( )20. A. supported B. repairing B. hot B. avoid B. therefore B. enjoy B. popular B. Simply B. leave B. expected B. ready B. picture B. trouble B. duty B. disappointing B. object B. try B. rags B. amazed B. gift B. understood C. washing C. different C. continue C. already C. buy C. confused C. Then C. make C. invited C. changed C. idea C. secret C. imagination C. hopeful C. belong C. help C. children C. bored C. story C. refused D. decorating D. dirty D. practise D. hardly D. serve D. difficult D. Luckily D. order D. encouraged D. familiar D. car D. theme D. skill D. natural D. refer D. smile D. fruit D. frightened D. explanation D. surrounded 查看答案
题型：问答题 简答题 设f(x)在(-∞，+∞)存在二阶导数，且f(x)=-f(-x)，当x＜0时有f’(x)＜0，f"(x)＞0，则当x＞0时有______。A．f’(x)＜0，f"(x)＞0 B．f’(x)＞0，f"(x)＜0C．f’(x)＞0，f"(x)＞0 D．f’(x)＜0，f"(x)＜0 查看答案