乙烯利（化学式为C2H6ClO3P）是一种优质高效植物生长调节剂，具_爱下问搜题

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问题选择题

乙烯利（化学式为C₂H₆ClO₃P）是一种优质高效植物生长调节剂，具有促进果实成熟等效应．下列有关乙烯利的说法正确的是（　　）

A．乙烯利是一种氧化物

B．每个乙烯利分子中含有13个原子

C．乙烯利中氢元素的质量分数为46.2%

D．乙烯利中碳、氢、氯、氧、磷五种元素的质量比为2：6：1：3：1

答案

A、由乙烯利的化学式为C₂H₆ClO₃P，该物质是由碳、氢、氯、氧、磷五种元素组成，而氧化物只有两种元素组成，则不属于氧化物，故A错误；

B、由乙烯利的化学式为C₂H₆ClO₃P，则1个分子中含有2个碳原子、6个氢原子、1个氯原子、3个氧原子、1个磷原子，共2+6+1+3+1=13个原子，故B正确；

C、由乙烯利的化学式为C₂H₆ClO₃P，则氢元素的质量分数为

1×6

12×2+1×6+35.5+16×3+31

×100%=4.15%，故C错误；

D、由乙烯利的化学式为C₂H₆ClO₃P，则碳、氢、氯、氧、磷五种元素的质量比为2×12：1×6：1×35.5：3×16：1×31=24：6：35.5：48：31，故D错误；

故选B．

单项选择题 A1/A2型题

“锤状指”带有撕脱小骨片时，保守治疗固定的位置为（）

A.近侧指间关节过伸，远侧指间关节屈曲位

B.近侧指间关节屈曲，远侧指间关节过伸位

C.近、远侧指间关节均屈曲位

D.近、远侧指间关节均过伸位

E.手指休息位

完形填空

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.

C．interviewed

A．disappeared

A．concentrate

A．Holding on to

B．Dating back to

C．Looking back on

D．Dropping in on