先化简，再求值：2a2-{-3a+5[4a2-（3a2-a-1）-3]-5}，其 发布时间：2017-05-20 13:27 │ 来源：www.tikuol.com 题型：解答题 问题： 先化简，再求值：2a2-{-3a+5[4a2-（3a2-a-1）-3]-5}，其中a=-112．
题型：解答题 完形填空。 Tears clouded my eyes as I stood in our washing room, holding Brett's jeans and shirt full of burn holes. Tired and defeated, I 1 to the floor. The clothes were just one more thing Brett had 2 . He often got almost everything in the house out of 3 . Many windows in our house needed repairing due to his breaking 4 to steal money when he chose to live on the street. Yet none of this could compare to the emotional 5 Brett had done to our once quiet home. Brett came to live with us when he was 12 years old. During the next few years I had dealt with Brett as 6 as possible, but inside I was shouting, "I don't want him in my house another day, Lord! I just can't 7 him!" Having wiped my tears, I continued 8 him as before. When Brett was nearly 18, he landed again in Juvenile Hall (少管所). After that, my husband and I had to send Brett to a boarding school for helping 9 teens (少年). At the 10 ceremony, each graduate held a white rose to give to the person who had 11 the most to him or her. Brett spoke 12 to his parents and then spoke to me, "You did so much. You were always there, no matter 13 . My mom and dad, I am their kid. But you, 14 troubled enough by me, always 15 me such love. And Iwant you to know I love you for it." 16 , I stood as Brett placed the white rose in my hand and hugged me 17 . At that moment, tears 18 in myeyes again, this time not for disappointment but for 19 . Although I had struggled with silent 20 toward my stepson (继子), Brett had seen only my actions. Love is action. We may not always have positive feelings about certain people in our life, but we can love them. ( )1. A. sat ( )2. A. lost ( )3. A. order ( )4. A. off ( )5. A. pain ( )6. A. patiently ( )7. A. forgive ( )8. A. feeding ( )9. A. lazy ( )10. A. opening ( )11. A. afforded ( )12. A. sadly ( )13. A. where ( )14. A. although ( )15. A. cost ( )16. A. Astonished ( )17. A. surely ( )18. A. fell ( )19. A. pity ( )20. A. love B. bent B. ruined B. place B. in B. injury B. willingly B. stand B. pardoning B. disappointing B. official B. meant B. lovingly B. how B. unless B. lent B. Puzzled B. tightly B. flowed B. luck B. anxiety C. sank C. torn C. trouble C. up C. harm C. strictly C. educate C. comforting C. troublesome C. graduation C. supplied C. proudly C. who C. because C. showed C. Encouraged C. roughly C. moved C. happiness C. care D. dropped D. broken D. danger D. away D. damage D. rudely D. control D. parenting D. careless D. victory D. owed D. nervously D. what D. when D. taught D. Interested D. fiercely D. gathered D. success D. anger 查看答案
题型：解答题 下列除杂质的操作中正确的是（ ）A．铁粉中混有铝粉：加入过量盐酸溶液充分反应、过滤B．SO2中混有HCl：将其通入水中C．Na2CO3固体中混有少量NaHCO3：加入适量NaOH溶液D．Al(OH)3中混有Mg(OH)2：加入足量烧碱溶液后过滤，向滤液中通入过量CO2后过滤 查看答案