问题
单项选择题 B型题
极性最大的是（）
A.R1=β-D-洋地黄毒糖-β-D葡萄糖，R2=甲基
B.R1=氢，R2=醛基
C.R1=α-L鼠李糖，R2=醛基
D.R1=α-L鼠李糖-β-D葡萄糖，R2=甲基
E.R1=氢，R2=甲基
答案
参考答案：D
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极性最大的是（）
A.R1=β-D-洋地黄毒糖-β-D葡萄糖，R2=甲基
B.R1=氢，R2=醛基
C.R1=α-L鼠李糖，R2=醛基
D.R1=α-L鼠李糖-β-D葡萄糖，R2=甲基
E.R1=氢，R2=甲基
参考答案：D
Some years ago when I was in my first year in college, I heard Salome Bey sing for the first time. The moment was exciting. Salome’s filled the room and brought the theater to life. I was so that I decided to write an article about her. I Salome Bey, telling her I was from Essence magazine, and that I wanted to meet her to talk about her career. She and told me to come to her studio next Tuesday. When I hung up, I was scared out of my mind. I I was lying. I was not a writer at all and hadn’t even written a grocery list. I interviewed Salome Bey the next Tuesday. I sat there , taking notes and asking questions that all began with, “Can you tell me…” I soon realized that Salome Bey was one thing, but writing a story for a national magazine was just impossible. The was almost unbearable. I struggled for days draft after draft. Finally I put my manuscript (手稿) into a large envelope and dropped it into a mailbox. It didn’t take long. My manuscript . How stupid of me! I thought. How could I in a world of professional writers? Knowing I couldn’t the rejection letter, I threw the unopened envelope into a drawer. Five years later, I was moving to California. While my apartment, I came across the unopened envelope. This time I opened it and read the editor’s letter in : Ms. Profit, Your story on Salome Bey is fantastic. Yet we need some more relevant materials. Please those and return the article immediately. We would like to your story soon. Shocked, it took me a long time to . Fear of rejection cost me dearly. I lost at least five hundred dollars and the chance of having my article appear in a major magazine. More importantly, I lost years of writing. Today, I have become a full-time writer. this experience, I’ve learned a very important lesson: You can’t to doubt yourself.
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