胃壁细胞分泌的内因子可与维生素B12结合，从而（）。 A.抑制维生素B12的吸收 B 发布时间：2019-02-22 13:57 │ 来源：www.tikuol.com 题型：单项选择题 问题： 胃壁细胞分泌的内因子可与维生素B12结合，从而（）。A.抑制维生素B12的吸收B.促进维生素B12的吸收C.促进胃酸分泌D.促进肠蠕动E.抑制胆汁分泌
题型：单项选择题 物质的性质决定其用途。下列有关物质性质和用途的说法中错误的是[ ]A.烧碱显碱性--可以中和酸性土壤B.氮气性质比较稳定--可充人食品包装袋中防腐C.铜片能导电--可作电极D.干冰升华吸收热量--可用于人工降雨 查看答案
题型：单项选择题 完形填空。 The train shakes back and forth, its wheels making a loud noise against the tracks.Outside the windowthe freezing cold of winter rules. The carriage is filled with cold, 1 passengers. Suddenly a little boy 2 his way through the grown-up legs and sits down by the window. He is all alone among the 3 grown-ups. What a brave child, I think.His father 4 to stay by the door behind us. The train begins to crawl into a tunnel. Then something very 5 happens suddenly. The little boy slides down from his seat and leans his hand on my knee. 6 , I think that he wants to 7 me and return to his father, so I help him to stand up. But instead he leans forward and holds his 8 uptowards mine. He wants to say something to me, I think.I lower my head to receive the 9 . Wrongagain! What I receive is a 10 kiss on the cheek. The boy calmly returns to his seat,leans back and continues looking out of the window. I am 11 . What just happened? A child kissing a(n) 12 grown-up on the train. How can anybody want to kiss such a man that has so much beard ? Soon enough, all of my neighbors are 13 kissed. Nervous and alittle surprised, we 14 at the father. When he sees our questioning 15 as he gets ready for his stop,he offers a clue. "He's so happy to be alive." the father says. "He has been very sick." Father and son 16 into the crowd moving toward the exit. Then doors close and the train goes on. On my cheek I can still 17 the child's kiss-a kiss that has triggered (触发) some soul-search inside me.How many grown-ups 18 kissing each other from the joy of being alive? How many even give much thought to the privilege(特权)of 19 ? The little kisser had taught us a sweet but serious lesson: Be careful. You don't let yourself 20 before your heart stops!( )1. A. excited ( )2. A. feels ( )3. A. unfriendly ( )4. A. likes ( )5. A. great ( )6. A. In no moment ( )7. A. beat ( )8. A. eyes ( )9. A. news ( )10. A. loud ( )11. A. pleased ( )12. A. well-known ( )13. A. expectedly ( )14. A. stare ( )15. A. glances ( )16. A. appear ( )17. A. touch ( )18. A. go around ( )19. A. a child ( )20. A. die B. tired B. winds B. friendly B. prefers B. strange B. For a moment B. tell B. ear B. message B. foolish B. shocked B. smart B. duly B. smile B. anger B. back B. trust B. come around B. a kiss B. stop C. pleased C. pushes C. angry C. chooses C. extraordinary C. For the moment C. inform C. head C. kiss C. strange C. satisfied C. unknown C. regularly C. warn C. mouths C. disappear C. smell C. keep on C. living C. sleep D. surprised D. picks D. kind D. agrees D. thrilling D. In a moment D. pass D. lip D. opinion D. fortunate D. interested D. familiar D. eventually D. whisper D. feeling D. follow D. feel D. insist on D. touching D. live 查看答案