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2015年诺贝尔奖获得者屠呦呦提取的抗疟新药青蒿素的结构简式,用键线式表示如图.

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    Robby was 11 when he took his first piano lesson. I1students begin at an earlier age,2I explained to Robby. Robby said it had always been his mother's dream to hear him play the piano. So I took him as a student.

Much3Robby tried, he4the sense of tone and basic rhythm. But be dutifully reviewed his lessons.

    Over the months he tried and tried, and he'd always say, “My mom's going to hear me play someday. ”But it seemed5 He just did not have any inborn ability.

    Then one day Robby stopped coming. I was glad, as he was a bad6for my teaching!I7he had decided to pursue something else.

    Several weeks later, my students were to have a recital(演奏会). To my surprise, Robby came, asking to play in the recital.

     “It is for8pupils, but you dropped.

     “My mom was sick. But I have been practicing. I've just got to play!” he insisted and I agreed.

    The night for the recital came. I put Robby up last in the program9I was to come up and thank all the students and play a finishing piece. I thought I could save his poor performance through my "curtain closer".

    The recital10well. Robby came up on stage. His clothes were wrinkled and his hair looked dirty. “How could his Mom?”I thought.

    Robby began and it was Mozart's work. I was not prepared for what I heard next. His fingers even11on the keys. After six and a half minutes he ended and people were all on their feet in wild12

    13and in tears I ran up and put my arms around Robby in joy. "I've never heard you play like that, Robby! How did you do it?"

    Through the microphone Robby explained :"Well , Miss Hondorf, remember I told you my mom was sick? Well.14she had cancer and15this morning. And well. . . She was born deaf, so tonight was the16time she ever heard me play. I wanted to make it17"

    There wasn't a18eye that evening. I thought to myself how much19my life had been for taking Robby as my pupil. However, he was the teacher, for it is he that showed me the meaning of20and love and believing in oneself.

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         邹忌修八尺有余,形貌昳丽。朝服衣冠,窥镜,谓其妻曰:“我孰与城北徐公美?”其妻曰:“君美甚,徐公何能及公也!”城北徐公,齐国之美丽者也。忌不自信,而复问其妾,曰:“吾孰与徐公美?”妾曰:“徐公何能及君也!”旦日,客从外来,与坐谈,问之:“吾与徐公孰美?”客曰:“徐公不若君之美。”明日,徐公来,孰视之,自以为不如;窥镜而自视,又弗如远甚。暮寝而思之,曰:“吾妻之美我者,私我也;妾之美我者,畏我也;客之美我者,欲有求于我也。”
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                                    ——《邹忌讽齐王纳谏》