题目

多聚酶链式反应（PCR）是一种体外迅速扩增DNA片段的技术．PCR过程一般经历30多次下述循环：95℃条件下使模板DNA变性、解链→55℃条件下复性→72℃条件下引物链延伸．下列有关PCR过程的叙述，不正确的是（ ） A．变性过程中破坏的是DNA分子内碱基对之间的氢键，与解旋酶的作用不同 B．复性过程中引物与DNA模板链的结合是依靠碱基互补配对原则完成的 C．延伸过程中需要DNA聚合酶、ATP、4种核糖核苷酸 D．PCR与细胞内DNA复制相比，其所需要酶的最适温She was a poor girl who worked to get money to pay for her lessons. She became the famous woman scientist of her time. That's the story of Marie Curie's life. She didn't mind working and she didn't care about the honors(荣誉)that were given to her in later years. Marie was born in 1867. Her name was Marie Sklosovska then. She lived in Poland. Her father was a teacher. Everyone soon saw that Marie had a quick mind. Marie's mother died when her youngest daughter was only ten. From then on, Marie knew that she would have to work hard at her lessons if she wanted to be successful(成功的)in her life. She studied very hard and was one of the best students at her school. Marie and her older sister, Bronya, wanted to study in France at the Sorbonne. But their father didn't have enough money to send them there. It was Marie who had an idea: she would teach at home and send her money to Bronya. After her sister finished studying in Paris, she would get work and send Marie the money to study there herself. So Marie worked very hard for six years to pay for her sister's studies. At last it was Marie's turn but when she got to France, her sister was married and could not give her much help. Again Marie worked. She studied in a small room without heat or light. She lived on bread and tea most of the time. But all she thought of was her maths and science. This was her world. After four years' hard work, Marie and her husband found something which was called radium(镭). They were given the Nobel Prize(诺贝尔奖)for their great discovery(发现). But they were too ill to go Stockholm themselves to receive it. Marie always said that it was because of her children that she want her work. And she discovered a hidden power and gave it to the world. It was the same power, however, that killed Marie in 1934.小题1:Marie Sklodovska was born in_______.A. France          B. Poland          C. Stockholm       D Sorbonne小题2:Marie did not go to Paris with her sister because_______.A．She did not want toB．He always thought of her maths and science first.C．She had to earn money to pay for her sister's study.D．She thought it more useful to make money.小题3:She received her higher education（教育）at_______.A. Poland      B. Stockholm       C. the Stockholm   D France小题4:The greatness（伟大）of Marie's life in fact is that_______.A．She received two Nobel PrizesB．She was the first woman to work at the SorbonneC．She helped her sister finish school.D．She worked hard without taking care of the fame and honors she received