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【答案与解析】本文是一篇记叙文。文章主要讲述了北京大学教授、最年轻的博导刘颗在学生时代追逐学业的故事。4.D细节理解题。根据第二段“Go to the United States for further study to lay a foundation for her futureresearch in bioscience,”可知，刘颖想要前往美国是为了在学业上进一步深造。5.A推理判断题。根据第三段“During her first year at the school,she worked hard to overcome the languagebarrier.She audiotaped (teachers'lectures,and spent over two hours listening to the tapes eachevening.”及第四段“During my first two years at the university,I had a hard time conducting researchprojects..Although I worked hard,I could not get ideal experimental results..”可推断，刘颖在德克萨斯大学前两年的学习生活很艰难。6.B细节理解题。根据第五段“Things took a turn for the better in2O08,when Liu conducted a researchproject successfully..”可知，刘颖在2008年的时候成功完成了一个研究项目。7.C推理判断题。通读全文可知，刘颖的求学经历并非一帆风顺，但是她意志坚定并孜孜以求，最终实现了理想。由此可推断，刘颖的故事主要告诉我们“有志者事竟成”。

5,记知F为椭圆C:。+示-1(o>b>0)的右焦点，0为坐标原点，P为椭圆C上-点.若|OP1=1OF,∠P0F-120,则椭圆C的离心率为现以地的受建容速销得C.√2-1DW5-1【答案】D【解析】记满圆C的左焦点为E,连接PE,在△POF中，可得PF1=√+c-2 Xe Xc X cos120=5c,在APOE中，可得PE1=c,故1PE+1PF=(WB+1)c=2a,则离心率e=B十1B-1.