发现DNA分子双螺旋结构的科学家是（ ）
A．沃森和克里克
B．达尔文
C．林奈
D．哈维
A、沃森、克里克的研究方向是蛋白质的x射线衍射．1951年克里克与沃森相遇，他们共同完成了一个伟大的成就，那就是揭开了DNA的双螺旋结构之谜．他们俩人利用获得的x射线衍射实验的结果建构了DNA的精确模型．符合题意．
B、达尔文是英国生物学家，进化论的奠基人．在探究生物进化奥秘的过程中，具有重要贡献，他提出了生物进化的自然选择学说，被恩格斯赞誉为“19世纪自然科学三大发现”之一．不符合题意．
C、林奈是瑞典的植物学家、冒险家，林奈在生物学中的最主要的成果是建立了人为分类体系和双命名法．不符合题意．
D、哈维是英国的生理学家．哈维是实验生理学的创始人之一，他首次阐明了血液循环的原理．不符合题意．
故选：A
I have only seen my father cry once. It was at the Alton Train Station, back when the trains will ran. I was on my way to Philadelphia to 1 the train that would take me to Boston and the college. I was eager(热切的) to go. College, with its 2 and the promise of the better future had become more interesting. It 3 me to see tears in my father’s eyes as he shook my hand and said goodbye. For eighteen years, we had never had a(n) 4 to say goodbye like this. He was taller than me, 5 I was not short. I was going somewhere, and he was seeing me off. He 6 me, but he had not needed to say before, and now his tears were 7 it. The tears in my father’s eyes told me that we would have less and less to do with each other. I had taken my 8 from his, and now I was learning it. The train 9 and I boarded(登上) it. My father looked smaller from the train. We 10 goodbye to each other through the window. I was wearing the heavy winter coat that my father had bought for me to keep me from catching a cold in New England.
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