有4种有机物: ① ② ③ ④CH3—CHCH—CN 其中可用于合成结构简式为的 发布时间：2017-06-20 15:58 │ 来源：www.tikuol.com 题型：选择题 问题： 有4种有机物:①②③④CH3—CHCH—CN其中可用于合成结构简式为的高分子材料的正确组合为（ ）A．①③④B．①②③C．①②④D．②③④
题型：选择题 完形填空。 Begin doing the work you love as soon as possible, even if you don't get paid for it, or if you canonly work at it 1 . Albert Einstein was 2 to get a job as a physics professor. He could have said tohimself, "Well, I just don't have the work relative to 3 . I should give up on it and settle for somethingelse." 4 , he wrote the two most famous papers while 5 as a patent office worker. After their 6 ,there was not any major 7 in the world that would not have wanted him to work for them. If you want to work as an artist and are 8 as a waiter, don't think of yourself as a waiter who 9 one day to become an artist. That puts the 10 you love somewhere off in the distant future. Rather, thinkyourself as 11 , supporting yourself by waiting tables and paint, or draw as much as you can. It is 12 to earn a living wage as a waiter working 24 hours a week. That 13 plenty of time to devote to trainingor developing your craft (手艺) in the 14 hours. While you are seeking the work you love, 15 helps to expand your awareness into the universe ofall possibilities. You don't want to be 16 the ideas of what you should do or what you have done before. Having opened to 17 the possibilities, you can make a final 18 and select the work you love as yourown. Doing the work you love 19 that you be equally comfortable with the imaginative and the 20 . Itrequires the ability to dream big dreams and the ability to face and master all the little details that makedreams come true.( )1. A. full-time ( )2. A. unable ( )3. A. science ( )4. A. So ( )5. A. employed ( )6. A. publication( )7. A. city ( )8. A. known ( )9. A. thinks ( )10. A. man ( )11. A. an artist ( )12. A. impossible ( )13. A. sends ( )14. A. on ( )15. A. it ( )16. A. interested in ( )17. A. no ( )18. A. decision ( )19. A. suggests ( )20. A. necessary B. hard B. able B. maths B. Instead B. regarded B. discoveries B. factory B. making a livingB. imagines B. woman B. a waiter B. possible B. spares B. office B. which B. devoted to B. all B. plan B. requires B. practical C. easily C. unwilling C. physics C. Therefore C. worked C. successes C. university C. leading a life C. hopes C. person C. a waitress C. important C. leaves C. business C. that C. limited to C. few C. conclusion C. insists C. careful D. part-time D. anxious D. money D. And D. recognized D. papers D. company D. chosen D. decides D. work D. a painter D. lucky D. takes D. off D. this D. troubled by.D. both D. judge D. encourages D. honest 查看答案
CH—CN
的高分子材料的正确组合为（ ）CH—CN的高分子材料的正确组合为（ ）