题目

孟德尔利用豌豆进行杂交实验，成功揭示了遗传的两条基本规律--分离定律和自由组合定律．他使用的科学研究方法主要是（ ） A．模型构建 B．假说-演绎法 C．类比推理 D．放射性同位素标记法 答案：解：A、沃森和克里克构建DNA双螺旋结构时，采用了模型构建的方法，但孟德尔遗传实验并没有采用模型构建的方法，A错误； B、孟德尔发生遗传定律采用了假说-演绎法，B正确； C、萨顿运用类比推理法提出了基因在染色体上的假说，而孟德尔遗传实验并为采用该方法，C错误； D、孟德尔遗传实验没有（2011·四川卷）完形填空 I truly feel that my mother led me here,to Morzaine,and to my future as happy wife and bussinesswoman.When Mum   21  in October 2007,I was cook.. In December that year.while Iwas working for a wedding,apearl neeklace Mum had left me      22      .I was distraught（忧心如焚的）.Some days later,I was     23      that a guy who was working with us that day。“could prnhably have made a fortune     24    the neeklace he found.”  25     .he returnde it.Hearing he I’d     26    Mum for six months before her death,he said,”Christmas is going to be  27  —why not go out to the Alps for a couple of I come to M? ,a small ,friendly village in the Alps and___28_ fell in love with it .What was __29__to be a stopgap (权宜之计) trip turned into a new life .I kept travelling between London and here and felt _30__than I had in months .In December 2008 , I was __31_as a hotel manager and moved here full time . A month later, I met Paul, who was traveling here. We fell in love. In the beginning , I didn’t want to discuss___32__, because the sadness of losing Mum__33__felt great. Paul understood that and sever___34__me. But, by summer, we got married. A year later, we used his saving, and the money from the sale of Mom’s house, to build our own ___35__. We want to give our guests a ___36__ feel, so each room is themed(以……为题) around memories from our lives. There are also style to remind me of Mom ---- a tiny chair which ___37___ be in her bedroom is set in one room. We are having a wonderful life Mum ___38___ naturally part of it, _39___ there’s no way we would be here. If it wasn’t for the __40__ she gave me. I know she’s here in spirit, keeping an eye on us . 21.A.died      B. came            C. returned          D.visited 22.A. burned   B. disappeared     C . broke            D. dropped 23.A.shown     B.comforted        C.persuaded          D.told 24.A.          B.stealing         C.selling            D.wearing 25.A.Luckly    B. Naturally       C.Surely             D.Hopefully 26.A.nursed    B. cured           C.missed             D.guarded 27.A.long           B. hard        C. merry            D.free 28.A. suddenly      B.finally      C. nearly           D.immediately 29.A.said           B.proved       C. supposed         D.judged 30.A.smarter        B.higher       C.firuer            D.lighter 31.A.phonnured      B.hired        C.regarded          D.trained 32.A. travel        B.business     C. children         D.marriner 33.A.recently       B.once         C.still             D.first 34.A.left           B.pushed       C.surprised         D.interrupted 35.A.hotel          B.restaurant   C.home              D.shop 36.A.homely         B.lively       C.motherly          D.friendly 37.A.ought to       B.used to      C.might             D.could 38.A. takes         B.keeps        C.looks             D.feels 39.A.unless         B.while        C.because           D.though 40.A.               B.chair        C.house             D.neeklace