基因的自由组合可导致生物多样性的原因是（） A.产生了新的基因型 B.改变了基因的结 发布时间：2019-03-10 08:33 │ 来源：www.tikuol.com 题型：单项选择题 问题： 基因的自由组合可导致生物多样性的原因是（）A.产生了新的基因型B.改变了基因的结构C.产生了新的基因D.改变了基因的数量
题型：单项选择题 完形填空。 I watched as my little brother was caught in the act. He was sitting in the comer of the living room, a 1 in one hand and my father's hymnbook (赞美诗集) in the other. As my father walked into the room, my brother cowered slightly (轻微地畏缩). He sensed that he had donesomething 2 . I could see that he had 3 my father's new hymnal and scribbled (乱涂) in it. Now he was waiting for his punishment. For my father, books were knowledge. They were important to him. And yet he loved his children. What hedid next was 4 . Instead of punishing my brother, he sat down, took the pen from my brother's hand, and thenwrote in the book himself, alongside the scribbles John had made:" 5 work,1959, age 2. How many times haveI looked into your beautiful face and into your warm eyes looking up at me and 6 Cod for the one who has now scribbled in my new hymnal. You have made the book sacred (神圣的), as have your brother and sister." "Wow," I thought. "This is 7 ?" The years and the books came and went. Our family experienced what all families go through and perhaps alittle bit more. But we always knew our parents 8 us and that one of the proofs (证明) of their love was thehymnal by the piano. Dad taught us about 9 really matters in life: people,not objects; tolerance (宽容), not judgment; love, not anger. Now I, too, am a father. But unlike my father,l do not wait for my daughters 10 to take books from mybookshelf and scribble in them. From time to time I take one down, and give it to one of my 11 to scribble in. And as I look at their artwork, I think about my father and the 12 he taught me. ( )1. A. book ( )2. A. wrong ( )3. A. dropped ( )4. A. unnecessary ( )5. A. My ( )6. A. asked ( )7. A. decision ( )8. A. loved ( )9. A. why ( )10. A. quickly ( )11. A. children ( )12. A. skills B. pen B. special B. read B. unbelievable B. Our B. trusted B. explanation B. encouraged B. which B. secretly B. sisters B. rules C. paper C. dangerous C. borrowed C. interesting C. John's C. respected C. punishment C. pleased C. who C. carefully C. brothers C. lessons D. ruler D. different D. opened D. important D. Father's D. thanked D. excitement D. missed D. what D. suddenly D. parents D. subjecls 查看答案
题型：单项选择题 对阴离子间隙的叙述错误的是（）A.是指细胞外液阳离子与阴离子之差B.公式为AG=Na+-（Cl-+HCO-3）C.临床以AG升高多见D.临床以AG降低多见E.对代谢性酸中毒有鉴别诊断的作用 查看答案
题型：单项选择题 案例：某汽车生产厂焊装车间主要承担白车身总成的焊装、铆接、铰接、螺柱焊接以及磨光检验等工作。主要焊接总成有：白车身总成、前地板总成、后地板总成、发动机框架总成、车身下体梁架总成、左右侧围总成、前车门、后门总成、尾门总成及发动机盖分总成以及其他移动件分总成等。焊装车间主要工艺流程为：地板焊接→左右侧围焊接→车身主焊接→调整→四门二盖焊接。 （说明：本题前2道题为单选题，后2道题为多选题。）电焊烟尘可引起《职业病目录》中的()职业病。A．外照射急性放射病B．电焊工尘肺C．职业性哮喘D．黑变病 查看答案