保管鲜水产品的基本原理，都是利用低温抑制微生物的活力，抑制其体内( )。A．氧的吸 发布时间：2017-06-22 16:28 │ 来源：www.tikuol.com 题型：单项选择题 问题： 保管鲜水产品的基本原理，都是利用低温抑制微生物的活力，抑制其体内( )。A．氧的吸收B．酶的活性C．温度的升高D．氧的消耗
题型：单项选择题 完形填空。 Even though it was only October, my students were already whispering about Christmas plans. With each passing day everyone became more 1 waiting for the final school bell.Upon its 2 everyone would run for their coats and go home, everyone except David. David was a small boy in ragged clothes. I had often 3 what kind of home life David had, and what kind of mother could send her son to school dressed so 4 for the cold winter months, without a coat, boots, or gloves. But something made David 5 . I can still remember he was always 6 a smile and willing to help. He always 7 after school to straighten chairs and mop the floor. We never talked much. He 8 just smile and ask what else he could do, then thank me for letting him stay and slowly 9 home. Weeks passed and the 10 ovre the coming Christmas grew into restlessness until the last day of 11 before the holiday break. I smiled in 12 as the last of them hurried out the door. Turning around I saw David 13 standing by my desk. "I have something for you" he said 14 from behind his back a small box. 15 it to me, he said anxiously "Open it". I took the box from him, thanked him and slowly unwrappedit. I lift the lid and to my 16 saw nothing. I looked at David's smiling face and backinto the box and said. "The box is nice, David, but it's 17 " "Oh, no, it isn't", said David, "It's full of love, my mum told me before she died that love was something you couldn't see or touch unless you know it's there". Tears filled my eyes 18 I looked at the proud dirty face that I had rarely given 19 to. After that Christmas, David and I became good friends and I never forgot the meaning 20 the little empty box set on my desk. ( )1. A. anxious ( )2. A. warning ( )3. A. scolded ( )4. A. modestly ( )5. A. popular ( )6. A. expressing ( )7. A. practiced ( )8. A. would ( )9. A. aim at ( )10. A. argument ( )11. A. school ( )12. A. relief ( )13. A. weakly ( )14. A. searched ( )15. A. Holding ( )16. A. delight ( )17. A. cheap ( )18. A. as ( )19. A. advice ( )20. A. from B. courageous B. ringing B. wondered B. naturally B. upset B. delivering B. wandered B. should B. turn to B. excitement B. year B. return B. sadly B. found B. Handing B. expectation B. empty B. until B. support B. behind C. serious C. calling C. realized C. inaccurately C. special C. wearing C. studied C. might C. put off C. movement C. education C. vain C. quietly C. raised C. Sending C. appreciation C. useless C. because C. attention C. over D. cautious D. yelling D. learned D. inappropriately D. funny D. sharing D. stayed D. could D. head for D. program D. program D. control D. helplessly D. pulled D. Leaving D. surprise D. improper D. though D. command D. towards 查看答案
题型：单项选择题 “类推”是常用的学习方法，但是有时会产生错误结论．下列类推结论中正确的是（ ）A．钠在空气中可生成氧化钠、过氧化钠，则锂可生成氧化锂、过氧化锂B．第2周期元素氢化物稳定性顺序是HF＞H2O＞NH3；则第三周期元素氢化物稳定性的顺序也是HCl＞H2S＞PH3C．卤素单质的沸点从上到下依次升高，则碱金属单质的沸点从上到下也依次升高D．浓硫酸敞口放在空气中质量增大，浓度变小，则浓硝酸敞口放在空气中也质量增大，浓度变小 查看答案